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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2011	Jan. 31, 2012	Jun. 30, 2011
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Entity Registrant Name	SMITH A O CORP
Entity Central Index Key	0000091142
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Common Stock [Member]
Entity Common Stock, Shares Outstanding		39,266,453
Entity Public Float			$ 1,586,129,826
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		6,679,997
Entity Public Float			$ 37,497,159

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 463.4	$ 118.9
Receivables	368.4	313.3
Inventories	168.4	146.8
Deferred income taxes	24.6	27.3
Investments	162.4
Other current assets	21.5	17.4
Current assets - discontinued EPC operations		272.3
Total Current Assets	1,208.7	896.0
Net property, plant and equipment	315.3	258.4
Goodwill	433.8	323.8
Other intangibles	352.7	106.6
Other assets	38.5	36.8
Deferred income taxes		89.7
Long-term assets - discontinued EPC operations		399.3
Total Assets	2,349.0	2,110.6
Liabilities
Trade payables	302.5	263.0
Accrued payroll and benefits	41.9	37.2
Accrued liabilities	77.2	53.3
Product warranties	43.7	36.4
Income taxes	4.5	5.7
Long-term debt due within one year	18.6	18.6
Current liabilities - discontinued EPC operations	31.5	122.6
Total Current Liabilities	519.9	536.8
Long-term debt	443.0	242.4
Deferred income taxes	3.1
Product warranties	88.1	75.8
Post-retirement benefit obligation	11.6	13.6
Pension liabilities	139.5	222.9
Other liabilities	49.3	59.2
Long-term liabilities - discontinued EPC operations	8.7	78.5
Total Liabilities	1,263.2	1,229.2
Commitments and contingencies
Stockholders' Equity
Preferred Stock
Class A Common Stock (shares issued 7,250,791 and 7,481,748)	36.3	37.4
Common Stock (shares issued 40,426,119 and 40,195,162)	40.4	40.2
Capital in excess of par value	652.5	655.7
Retained earnings	729.9	452.1
Accumulated other comprehensive loss	(300.9)	(229.4)
Treasury stock at cost	(72.4)	(74.6)
Total Stockholders' Equity	1,085.8	881.4
Total Liabilities and Stockholders' Equity	$ 2,349.0	$ 2,110.6

Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Class A Common Stock, shares issued	7,250,791	7,481,748
Common Stock, shares issued	40,426,119	40,195,162

Consolidated Statement Of Earnings - USD ($) $ in Millions	12 Months Ended
Consolidated Statement Of Earnings - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Continuing Operations
Net sales	$ 1,710.5	$ 1,489.3	$ 1,375.0
Cost of products sold	1,197.9	1,043.3	980.1
Gross profit	512.6	446.0	394.9
Selling, general and administrative expenses	372.8	328.7	291.8
Flood related expense		35.4
Restructuring, impairment and settlement (income) expense - net	(11.2)	0.1	1.3
Interest expense	9.3	6.9	7.2
Other (income) expense - net	(19.8)	0.5	2.8
Earnings before provision for income taxes	161.5	74.4	91.8
Provision for income taxes	50.3	17.3	30.9
Earnings before equity loss in joint venture and discontinued operations	111.2	57.1	60.9
Equity loss in joint venture			(0.4)
Earnings from Continuing Operations	111.2	57.1	60.5
Discontinued Operations
Earnings from discontinued operations, less tax provision (benefit) for income taxes of $15.5 in 2011, $16.2 in 2010 and $(1.3) in 2009	43.0	54.4	29.1
Gain on sale of discontinued EPC operations, less tax provision of $145.6	151.5
Net Earnings	305.7	111.5	89.6
Net loss (earnings) attributable to noncontrolling interest:
Continuing operations		0.2	(9.6)
Discontinued operations			1.3
Net earnings attributable to A. O. Smith Corporation	$ 305.7	$ 111.7	$ 81.3
Net Earnings Per Share of Common Stock
Continuing Operations	$ 2.41	$ 1.25	$ 1.48
Discontinued Operations	4.22	1.19	0.89
Net Earnings attributable to A. O. Smith Corporation	6.63	2.44	2.37
Diluted Net Earnings Per Share of Common Stock
Continuing Operations	2.39	1.24	1.48
Discontinued Operations	4.18	1.18	0.88
Net Earnings attributable to A. O. Smith Corporation	$ 6.57	$ 2.42	$ 2.36

Consolidated Statement Of Earnings (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Earnings [Abstract]
Earnings from discontinued operations, provision (benefit) for income taxes	$ 15.5	$ 16.2	$ (1.3)
Gain on sale of discontinued EPC operations, provision	$ 145.6

- Definition

Tax expense or benefit on the gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

+ References + Details

Consolidated Statement Of Comprehensive Earnings (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Earnings (Loss) [Abstract]
Net Earnings	$ 305.7	$ 111.5	$ 89.6
Other comprehensive (loss) earnings
Foreign currency translation adjustments	(7.2)	7.3	2.9
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009	(11.0)	(0.2)	54.7
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009	(54.5)	(5.6)	(6.7)
Unrealized gain on investments less related tax provision of $0.7 in 2011	1.2
Less comprehensive earnings attributable to noncontrolling interest			(20.6)
Reclass of accumulated comprehensive loss associated with noncontrolling interest			(179.7)
Comprehensive Earnings (Loss)	$ 234.2	$ 113.0	$ (59.8)

Consolidated Statement Of Comprehensive Earnings (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Earnings (Loss) [Abstract]
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision)	$ 7.0	$ 0.1	$ (35.0)
Change in pension liability, related income tax benefit	34.8	$ 2.7	$ 4.3
Unrealized gain on investments, related tax provision	$ 0.7

- Definition

The tax effect of the amount of the change in the additional minimum pension liability not yet recognized pursuant to FAS 87 as a net periodic pension cost. If the additional pension liability required to be recognized exceeds the unrecognized prior service costs, then the excess (which is the net loss not yet recognized as net periodic pension cost) is to be recorded as a separate component in other comprehensive income, before adjusting for tax effects. In a subsequent measurement, the elimination or adjustment to the amount of the minimum pension liability recorded in accumulated other comprehensive income is included in this line. Eliminated upon adoption of FAS 158.

+ References + Details

Consolidated Statement Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net Earnings	$ 305.7	$ 111.5	$ 89.6
Less earnings from discontinued operations		(54.4)	(29.1)
Adjustments to reconcile earnings from continuing operations to cash provided by operating activities:
Depreciation and amortization	47.0	40.8	38.3
Loss on disposal of assets	1.0	11.7	0.9
Unrealized gain on investment	(19.8)
Net changes in operating assets and liabilities, net of acquisitions:
Current assets and liabilities	8.0	(37.5)	46.8
Noncurrent assets and liabilities	(86.4)	(8.8)	(24.3)
Other			0.7
Cash Provided by Operating Activities - continuing operations	61.0	63.3	122.9
Cash (Used in) Provided by Operating Activities - discontinued operations	(2.3)	61.5	140.0
Cash Provided by Operating Activities	58.7	124.8	262.9
Investing Activities
Acquisition of businesses	(421.1)	(11.8)	(71.4)
Proceeds from sale of investments		4.6	8.9
Proceeds on sale of assets		3.0	2.0
Net cash distributed with spinoff of discontinued SICO businesses			(7.1)
Capital expenditures	(53.5)	(53.5)	(42.7)
Cash Used in Investing Activities - continuing operations	(474.6)	(57.7)	(110.3)
Cash Provided by (Used in) Investing Activities - discontinued operations	600.2	(8.8)	(6.7)
Cash Provided by (Used in) Investing Activities	125.6	(66.5)	(117.0)
Financing Activities
Long-term debt incurred	200.2	5.0
Long-term debt repaid			(91.1)
Common stock repurchase	(23.5)
Net proceeds from stock option activity	11.2	4.0	7.6
Dividends paid	(27.7)	(24.7)	(21.4)
Cash Provided by (Used in) Financing Activities - continuing operations	160.2	(15.7)	(104.9)
Cash Used in Financing Activities - discontinued operations
Cash Provided by (Used in) Financing Activities	160.2	(15.7)	(104.9)
Net increase in cash and cash equivalents	344.5	42.6	41.0
Cash and cash equivalents-beginning of year	118.9	76.3	35.3
Cash and Cash Equivalents-End of Year	$ 463.4	$ 118.9	$ 76.3

Consolidated Statement Of Stockholders' Equity - USD ($) $ in Millions	Class A Common Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2008	$ 60.4	$ 2.3	$ (62.4)	$ 316.1	$ (89.8)		$ 436.6
Net earnings				81.3				$ 81.3
Activity related to the spin off of SICO discontinued businesses				(32.8)
Cash dividends on stock				(11.8)
Foreign currency translation adjustments					2.9			2.9
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009					54.7			54.7
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009					(6.7)			6.7
Unrealized gain on investments less income tax provision of $0.7 in 2011
Net earnings							8.3
Comprehensive gain							12.3
Less noncontrolling interest in other comprehensive gain					(12.3)
Reverse acquisition of SICO	0.8	33.3	676.1	12.6	(179.7)	$ (84.3)	(449.4)
Conversion of Class A Common Stock	(21.9)	4.3	17.6
Issuance of share units			(0.1)
Stock based compensation expense			3.5
Exercise of stock options			(0.9)			4.4
Tax benefit from exercise of stock options and vesting of share units			2.9
Cash dividends on stock							(7.8)
Stock incentives and directors' compensation			0.2
Acquisition of Tianlong							19.2
Net earnings of Tianlong							(0.1)
Balance at Dec. 31, 2009	39.3	39.9	636.9	365.4	(230.9)	(79.9)	19.1	789.8
Net earnings				111.7				111.7
Cash dividends on stock				(25.0)
Foreign currency translation adjustments					7.3			7.3
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009					(0.2)			(0.2)
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009					(5.6)			5.6
Unrealized gain on investments less income tax provision of $0.7 in 2011
Less noncontrolling interest in other comprehensive gain
Conversion of Class A Common Stock	(1.9)	0.3	1.6
Issuance of share units			(3.1)
Vesting of share units			(1.6)
Stock based compensation expense			6.1
Exercise of stock options			(1.2)			4.6
Tax benefit from exercise of stock options and vesting of share units			0.7
Stock incentives and directors' compensation			3.4			0.3
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010						0.4
Net earnings of Tianlong							(0.2)
Buy out of Tianlong			12.9				$ (18.9)
Balance at Dec. 31, 2010	37.4	40.2	655.7	452.1	(229.4)	(74.6)		881.4
Net earnings				305.7				305.7
Cash dividends on stock				(27.9)
Foreign currency translation adjustments					(7.2)			(7.2)
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009					(11.0)			(11.0)
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009					(54.5)			54.5
Unrealized gain on investments less income tax provision of $0.7 in 2011					1.2			1.2
Less noncontrolling interest in other comprehensive gain
Conversion of Class A Common Stock	(1.1)	0.2	0.9
Issuance of share units			(3.7)
Vesting of share units			(8.2)
Stock based compensation expense			6.7
Exercise of stock options			(7.5)			15.3
Tax benefit from exercise of stock options and vesting of share units			4.3
Stock incentives and directors' compensation			4.3			0.4
Shares repurchased						(23.5)		(23.5)
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010						10.0
Balance at Dec. 31, 2011	$ 36.3	$ 40.4	$ 652.5	$ 729.9	$ (300.9)	$ (72.4)		$ 1,085.8

Consolidated Statement Of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Stockholders' Equity [Abstract]
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision)	$ 7.0	$ 0.1	$ (35.0)
Change in pension liability, related income tax benefit	$ 34.8	$ 2.7	$ 4.3
Exercise of stock options, shares surrendered as proceeds			258,238
Vesting of share units, shares surrendered to pay taxes		27,561
Unrealized net gain on investments, related tax provision	$ 0.7

- Definition

+ References + Details

Organization And Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Organization And Significant Accounting Policies [Abstract]

Organization And Significant Accounting Policies

1. Organization and Significant Accounting Policies

Organization. A. O. Smith Corporation (A. O. Smith or the company) is a manufacturer of water heaters and boilers, serving a diverse mix of residential and commercial end markets principally in the United States with a strong and growing international presence. The company is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

On August 22, 2011, the company sold its Electrical Products (EPC) business to Regal Beloit Corporation (RBC) for approximately $760 million in cash and approximately 2.83 million shares of RBC common stock. Due to the sale, EPC has been reported separately as a discontinued operation.

Consolidation. The consolidated financial statements include the accounts of the company and its wholly owned subsidiaries after elimination of intercompany transactions.

On April 22, 2009, A. O. Smith Corporation (the company) closed on a merger transaction with Smith Investment Company (SICO). The merger was approved by A. O. Smith's stockholders on April 14, 2009.

The transaction between the company and SICO has been accounted for as a reverse acquisition with SICO as the accounting acquirer and the company (which is the surviving entity for legal purposes) as the accounting acquiree. As this is a common control transaction under Accounting Standards Codification (ASC) 805 Business Combinations (formerly Statement of Financial Accounting Standard (SFAS) 141(R)), the transaction is accounted for as an equity transaction under ASC 810-10 Consolidations (formerly SFAS 160). The acquisition of a noncontrolling interest does not require purchase accounting.

Furthermore, because SICO is the continuing reporting entity for accounting purposes, the reports filed by the company as the surviving corporation in the transaction will parallel the financial reporting required under Generally Accepted Accounting Principles (GAAP) and Securities and Exchange Commission (SEC) reporting rules as if SICO were the legal successor as of the date of the transaction. Accordingly, prior period financial information presented in the company's financial statements reflects the historical activity of SICO.

On January 19, 2009, SICO distributed all of its assets and liabilities other than its ownership of A. O. Smith stock. These assets and liabilities related primarily to the multicolor printing business conducted through Berlin Industries, Inc. and the commercial warehousing, trucking and packaging business conducted through Central States Distribution Service, Inc.

Except when otherwise indicated, amounts reflected in the financial statements or the notes thereto relate to the company's continuing operations.

Use of estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the accompanying financial statements and notes. Actual results could differ from those estimates.

Fair value of financial instruments. The carrying amounts of cash and cash equivalents, receivables, floating rate debt and trade payables approximated fair value as of December 31, 2011 and 2010, due to the short maturities or frequent rate resets of these instruments. The fair value of term notes with insurance companies was approximately $106.7 million as of December 31, 2011 compared with the carrying amount of $97.7 million for the same date. The fair value is estimated based on current rates offered for debt with similar maturities.

Foreign currency translation. For all subsidiaries outside the U.S., with the exception of its Mexican operation and two of its Chinese non-operating companies, the company uses the local currency as the functional currency. For those operations using a functional currency other than the U.S. dollar, assets and liabilities are translated into U.S. dollars at year-end exchange rates, and revenues and expenses are translated at weighted-average exchange rates. The resulting translation adjustments are recorded as a separate component of stockholders' equity. The Mexican operation and the two Chinese non-operating companies use the U.S. dollar as the functional currency as such operations are a direct and integral component of the company's U.S. operations. Gains and losses from foreign currency transactions are included in net earnings.

Cash and cash equivalents. The company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Inventory valuation. Inventories are carried at lower of cost or market. Cost is determined on the last-in, first-out (LIFO) method for substantially all domestic inventories, which comprise 65 percent and 60 percent of the company's total inventory at December 31, 2011 and 2010, respectively. Inventories of foreign subsidiaries and supplies are determined using the first-in, first-out (FIFO) method.

Property, plant and equipment. Property, plant and equipment are stated at cost. Depreciation is computed primarily by the straight-line method. The estimated service lives used to compute depreciation are generally 25 to 50 years for buildings, three to 20 years for equipment and three to seven years for software. Maintenance and repair costs are expensed as incurred.

Goodwill and other intangibles. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed for impairment on an annual basis. Separable intangible assets primarily comprised of customer relationships that are not deemed to have an indefinite life are amortized on a straight-line basis over their estimated useful lives which range from ten to 25 years.

Impairment of long-lived and amortizable intangible assets. Property, plant and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If the sum of the expected undiscounted cash flows is less than the carrying value of the related asset or group of assets, a loss is recognized for the difference between the fair value and carrying value of the asset or group of assets. Such analyses necessarily involve significant judgment.

Derivative instruments. ASC 815 Derivatives and Hedging (formerly SFAS 133), as amended, requires that all derivative instruments be recorded on the balance sheet at fair value and establishes criteria for designation and effectiveness of the hedging relationships. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as a part of a hedging relationship and further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, the company must designate the hedging instrument, based upon the exposure hedged, as a fair value hedge, cash flow hedge, or a hedge of a net investment in a foreign operation.

The company designates that all of its hedging instruments, except for its equity collar contract relating to RBC shares, are cash flow hedges. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (OCI), net of tax, and is reclassified into earnings in the same line item associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. The amount by which the cumulative change in the value of the hedge more than offsets the cumulative change in the value of the hedged item (i.e., the ineffective portion) is recorded in earnings, net of tax, in the period the ineffectiveness occurs.

The company utilizes certain derivative instruments to enhance its ability to manage currency and interest rate exposures as well as raw materials price risk and equity investment volatility. Derivative instruments are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The company does not enter into contracts for speculative purposes. The contracts are executed with major financial institutions with no credit loss anticipated for failure of the counterparties to perform.

Commodity Futures Contracts

In addition to entering into supply arrangements in the normal course of business, the company, primarily for its discontinued operation, also enters into futures contracts to fix the cost of certain raw material purchases, principally copper and aluminum, with the objective of minimizing changes in cost due to market price fluctuations. The hedging strategy for achieving this objective is to purchase commodities futures contracts on the open market of the London Metals Exchange (LME) or over the counter contracts based on the LME.

With one of its brokers, the company is required to make cash deposits on unrealized losses on commodity derivative contracts that exceed $10.0 million.

The after-tax loss of the effective portion of the contracts of $0.1 million as of December 31, 2011 was recorded in accumulated other comprehensive loss, and will be reclassified into cost of products sold in the period in which the underlying transaction is recorded in earnings. The effective portion of the contracts will be reclassified within one year. Contracts related to the company's discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 was minimal and was recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively. Commodity hedges outstanding at December 31, 2011 are a total of approximately 0.3 million pounds of copper.

Foreign Currency Forward Contracts

The company is exposed to foreign currency exchange risk as a result of transactions in currencies other than the functional currency of certain subsidiaries. The company utilizes foreign currency forward purchase and sale contracts to manage the volatility associated with foreign currency purchases, sales and certain intercompany transactions in the normal course of business. Principal currencies include the Canadian dollar, Mexican peso and Euro.

Gains and losses on these instruments are recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction is recorded in earnings. When the hedged item is realized, gains or losses are reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for forward contracts is based on changes in the forward rates. These hedges have been determined to be effective.

The majority of the amounts in accumulated other comprehensive loss for cash flow hedges is expected to be reclassified into earnings within one year and all of the hedges will be reclassified into earnings no later than December 2013. Contracts related to the company's discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 of $3.2 million and $0.4 million were recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively.

The following table summarizes, by currency, the contractual amounts of the company's foreign currency forward contracts:


December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-

Total	$	32.6	$	37.8	$	11.2	$	37.6

Interest Rate Swap Agreement

The company is exposed to interest rate risk as a result of its floating rate borrowings under its revolving credit facility. The company used an interest rate swap to manage this risk. The company's one interest rate swap in the amount of $25 million expired in November 2010.

The interest rate swap was designated and accounted for as a cash flow hedge of floating rate debt. A derivative interest rate liability of $1.0 million as of December 31, 2009 was recorded in accrued liabilities. Gains and losses on this instrument were recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction was recorded in earnings. When

the hedged item was realized, gains or losses were reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for the interest rate swap was based on changes in floating rate interest rates. This swap was determined to be highly effective.

Equity Collar Contract

As discussed in Note 2, on August 22, 2011, the company sold EPC to RBC and received approximately 2.83 million RBC shares. The RBC share price appreciated in the first quarter of 2011 during which the company entered into an equity collar contract for 50 percent of the RBC shares to protect a portion of that appreciation. The put strike price of the equity collar is $63.29 and the call strike price of the collar is $77.32. The RBC share price on December 31, 2011 was $50.97. The collar does not qualify for hedge accounting and therefore is adjusted to fair value on a quarterly basis through earnings from continuing operations. The company is required to make cash or stock deposits on unrealized losses on the equity collar that exceed $25.0 million. The mark to market accounting for the RBC shares and hedge will continue until the equity collar contract expires in March 2012.

The impact of derivative contracts on the company's financial statements is as follows (dollars in millions):

Fair value of derivative instruments designated as hedging instruments under ASC 815 in continuing operations:


December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1

Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:


December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-

Total derivatives not designated as hedging instruments		$	17.9	$	-

The effect of derivative instruments on the Statement of Earnings for continuing and discontinued operations.

Year ended December 31,


Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-

	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivative	Amount of gain recognized in earnings from continuing operations on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

Fair Value Measurements. The company adopted ASC 820 Fair Value Measurements and Disclosures (formerly SFAS 157) on January 1, 2008. ASC 820, among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring basis or nonrecurring basis. ASC 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets and liabilities measured at fair value are based on the market approach which are prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities.

Continuing assets measured at fair value on a recurring basis are as follows (dollars in millions):


Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8

Total Investments and Net Derivative Contracts	$	162.0	$	1.4

There were no changes in our valuation techniques used to measure fair values on a recurring basis as a result of adopting ASC 820.

Revenue recognition. The company recognizes revenue upon transfer of title, which occurs upon shipment of the product to the customer except for certain export sales where transfer of title occurs when the product reaches the customer destination.

Contracts and customer purchase orders are used to determine the existence of a sales arrangement. Shipping documents are used to verify shipment. The company assesses whether the selling price is fixed or determinable based upon the payment terms associated with the transaction and whether the sales price is subject to refund or adjustment. The company assesses collectability based on the creditworthiness of the customer as determined by credit checks and analysis, as well as the customer's payment history, and does not require collateral on sales in most cases. The allowance for doubtful accounts was $3.4 million and $3.5 million at December 31, 2011 and 2010, respectively.

Accruals for customer returns for defective product are based on historical experience with similar types of sales. Accruals for rebates and incentives are based on pricing agreements and are tied to sales volume. Changes in such accruals may be required if future returns differ from historical experience or if actual sales volume differs from estimated sales volume. Rebates and incentives are recognized as a reduction of sales.

Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold.

Advertising. The majority of advertising costs are charged to operations as incurred and amounted to $58.9 million, $47.9 million and $41.0 million during 2011, 2010 and 2009, respectively. Included in total advertising costs are expenses associated with store displays and shell water units for A. O. Smith branded products in China that are amortized over 12 to 24 months which totaled $13.1 million, $9.2 million and $5.7 million during 2011, 2010 and 2009, respectively.

Research and development. Research and development costs are charged to operations as incurred and amounted to $42.7 million, $37.1 million and $31.0 million during 2011, 2010 and 2009, respectively.

Product warranties. The company's products carry warranties that generally range from one to ten years and are based on terms that are generally accepted in the market. The company records a liability for the expected cost of warranty-related claims at the time of sale. The allocation of our warranty liability between current and long-term is based on expected warranty claims to be paid in the next year as determined by historical product failure rates.

The following table presents the company's product warranty liability activity in 2011 and 2010:


Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)

Balance at end of year	$	131.8		$	112.2

See Note 4 for discussion on the increase in warranty reserve due to settlement and the increase in warranty expense and reserve associated with component issues in Canada.

Environmental costs. The company accrues for costs associated with environmental obligations when such costs are probable and reasonably estimable. Costs of estimated future expenditures are not discounted to their present value. Recoveries of environmental costs from other parties are recorded as assets when their receipt is considered probable. The accruals are adjusted as facts and circumstances change.

Stock-based compensation. The company follows ASC 718, Compensation—Stock Compensation (formerly SFAS 123(R)). Compensation cost is recognized using the straight-line method over the vesting period of the award. ASC 718 also requires the benefits of tax deductions in excess of recognized compensation cost to be reported as a financing cash flow, rather than as an operating cash flow as required under prior literature. Excess tax deductions of $4.3 million, $0.7 million and $2.9 million were recognized as financing cash flows in 2011, 2010 and 2009, respectively.

Earnings per share of common stock. The company is not required to use the two-class method of calculating earnings per share since its Class A Common Stock and Common Stock have equal dividend rights. The numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:


	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599

Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

On October 11, 2010, the company's board of directors declared a three-for-two stock split of the company's Class A Common Stock and Common Stock in the form of a 50 percent stock dividend to stock holders of record on October 29, 2010 and payable on November 15, 2010. Shares held in treasury by the company were not impacted by the split. All references in the financial statements to number of shares outstanding, price per share, per share amounts and stock based compensation data have been retroactively restated to reflect the split for all periods presented.

The weighted average shares presented above have been impacted by the accounting treatment of the company's transaction with SICO which closed on April 22, 2009 and is discussed in more detail earlier in Note 1 to the Notes to Consolidated Financial Statements. The primary accounting impact of the SICO transaction is in the calculation of earnings per share since the accounting rules require the use of SICO adjusted average shares outstanding rather than A. O. Smith Corporation average shares outstanding prior to the closing. The SICO average shares outstanding reflect the historical shares of SICO multiplied by their exchange ratio from the April 22, 2009 merger transaction. Subsequent to the closing, A. O. Smith Corporation average shares are used in the calculation.

Reclassifications. Certain amounts from prior years have been reclassified to conform with current year presentation.

Recent Accounting Pronouncements

In June 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-05, "Comprehensive Income (Topic 220): Presentation of Comprehensive Income." ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of shareholders' equity. ASU 2011-05 will be effective for the quarter ending March 31, 2012. The adoption of this guidance will have no impact on the company's financial condition or results of operations but will impact the presentation of the financial statements. The company is currently evaluating the presentation options.

In September 2011, the FASB issued ASU 2011-08, "Testing of Goodwill for Impairment (Topic 350)". ASU 2011-08 allows companies to assess qualitative factors to determine whether the two-step quantitative goodwill impairment test needs to be performed. Under the option, an entity no longer would be required to calculate the fair value of a reporting unit unless it determines, based on that qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. The ASU may change how a company tests goodwill for impairment but should not change the timing or measurement of goodwill impairments. The ASU will be effective for the year ending December 31, 2012. The company is currently reviewing the standard for applicability.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Discontinued Operations

12 Months Ended

Dec. 31, 2011

Discontinued Operations [Abstract]

Discontinued Operations

2. Discontinued Operations

On August 22, 2011, the company completed the sale of EPC to RBC for $759.9 million in cash and approximately 2.83 million of RBC shares. Included in the $759.9 million of cash is a final working capital adjustment of $7.4 million which is recorded as a receivable from RBC. The value of the RBC shares on the date of the closing of the sale was $140.6 million. See Note 13 for further discussion regarding the company's investment in RBC stock. The company has paid $126.5 million in income taxes and $21.4 million in commissions and other sale related payments as of December 31, 2011 and estimates it will pay $34.2 million in income taxes in 2012.

Included in the gain on sale of EPC was an additional income tax accrual of $56.5 million due to the company's assertion that certain foreign earnings derived from the sale of EPC were not considered permanently reinvested by the company. The accrual is included in long term deferred income taxes in continuing operations. Also included in the gain on sale is a $10.9 million gain related to cumulative translation adjustments associated with EPC's foreign subsidiaries.

The results of EPC including all prior years have been reported separately as discontinued operations.

The components of the net assets of EPC discontinued operations were:


(dollars in millions)	December 31, 2010
Current Assets
Trade receivables	$	110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0

Total Current Assets		272.3

Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8

Total Assets	$	671.6


Current Liabilities
Trade payables	$	89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5

Total Current Liabilities		122.6

Deferred taxes		77.2
Other liabilities		1.3

Total Liabilities		201.1

Total Net Assets	$	470.5

Current liabilities-net of $31.5 million and long-term liabilities-net of $8.7 million of the EPC discontinued operations at December 31, 2011 consist primarily of certain retained product liabilities, employee obligations such as workers' compensation and disability and income tax liabilities associated with EPC.

The condensed statement of earnings of the EPC discontinued operations is:


Years ended December 31 (dollars in millions)
	2011			2010			2009
Net sales	$	531.8		$	701.8		$	616.5
Cost of products sold		415.6			544.0			510.5

Gross profit		116.2			157.8			106.0
Selling, general and administrative expenses		61.5			84.2			74.8
Restructuring and other		-			0.1			(1.6	)
Interest expense		2.2			3.6			4.7
Other (income) expense—net		(6.0	)		(0.7	)		0.3

		58.5			70.6			27.8
Provision (benefit) for income taxes		15.5			16.2			(1.3	)

Net earnings	$	43.0		$	54.4		$	29.1

Consolidated interest expense not directly attributable to other operations was allocated to discontinued operations based on the ratio of EPC net assets to be sold to the sum of consolidated net assets plus consolidated debt not directly attributable to other operations.

The cash flow provided by EPC discontinued operations is as follows:


Years ended December 31 (dollars in millions)
	2011			2010			2009

Operating Activities
Earnings	$	43.0		$	54.4		$	29.1
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5			26.1			29.2
Gain on sale of assets		(4.8	)		(0.2	)		(2.0	)
Net changes in operating assets and liabilities
Current assets and liabilities		(56.2	)		(23.3	)		74.5
Noncurrent assets and liabilities		0.9			4.5			9.9
Other		(1.7	)		-			(0.7	)

Cash (Used in) Provided by Discontinued Operating Activities		(2.3	)		61.5			140.0

Investing Activities
Capital expenditures		(10.5	)		(14.3	)		(14.3	)
Proceeds on sale of assets		6.1			5.5			7.6
Proceeds from sale of operations		752.5			-			-
Payments associated with sale		(147.9	)		-			-

Cash Provided by (Used in) Discontinued Investing Activities		600.2			(8.8	)		(6.7	)

Cash Flow Provided by Discontinued Operations	$	597.9		$	52.7		$	133.3

In the second quarter of 2011, the company sold a facility in China and recognized a gain of $4.8 million.

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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-Section 45
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

+ Details

Acquisitions

12 Months Ended

Dec. 31, 2011

Acquisitions [Abstract]

Acquisitions

3. Acquisitions

On August 26, 2011, the company acquired 100 percent of the shares of Lochinvar Corporation (Lochinvar), a privately held manufacturer of high-efficiency boilers used in residential and commercial hydronic heating and hot water applications located in Lebanon, Tennessee. The addition of Lochinvar expands the company's product offerings and gives the company access to proven high-efficiency boiler technology. Lochinvar is included in the North America segment.

The company paid an aggregate cash purchase price, net of $1.5 million of cash acquired, of $421.1 million. In addition, the company incurred acquisition costs of approximately $5.5 million. Under the purchase agreement for the Lochinvar acquisition, the company agreed to make a contingent payment of up to an additional $35.0 million in cash based on the amount by which Lochinvar sales between December 1, 2011 and November 30, 2012 exceed $216.0 million. As of the acquisition date and December 31, 2011, the fair value of the contingent payment has been estimated at $16.8 million.

The following table summarizes the allocation of fair value of the assets acquired and liabilities assumed at the date of acquisition. Of the $258.3 million of acquired intangible assets, $103.5 million has been assigned to tradenames that are not subject to amortization and $152.5 million has been assigned to customer lists which are being amortized over 19 years, and the remaining $2.3 million has been assigned to non-compete agreements and patents which are being amortized over ten years.


August 26, 2011 (dollars in millions)

Current assets, net of cash acquired	$	54.0
Property, plant and equipment		41.9
Intangible assets		258.3
Other assets		0.1
Goodwill		111.4

Total assets acquired		465.7
Current liabilities		24.3
Long-term liabilities		3.5

Total liabilities assumed		27.8

Net assets acquired	$	437.9

For income tax purposes, the transaction has been accounted for as an asset purchase, resulting in the full amount of goodwill and intangible assets, totaling $369.7 million being deductible for income tax purposes.

Lochinvar's results of operations have been included in the company's financial statements from August 26, 2011, the date of acquisition. Revenues and pretax earnings associated with Lochinvar included in operations totaled $75.9 million and $5.6 million, respectively which included $13.0 million of operating earnings less $5.5 million of acquisition costs included in selling, general and administrative expense and $1.9 million of interest expense.

The following table represents the pro forma unaudited results of operations for the company for the years ended December 31, 2011 and 2010, respectively, assuming consummation of the purchase of Lochinvar as of January 1, of each year. (dollars in millions except per share data):


	Years ended December 31,
	2011		2010
Net sales	$	1,835.8	$	1,664.0
Earnings from continuing operations		122.5		71.5
Earnings per common share:
Basic	$	2.66	$	1.56

Diluted	$	2.63	$	1.55

The pro forma results have been prepared for informational purposes only and include adjustments to depreciation expense of acquired plant and equipment, amortization of intangible assets other than goodwill and tradenames, increased interest expense on acquisition related debt, and certain other adjustments, together with related income tax effects of such adjustments. These pro forma results do not purport to be indicative of the results of operations that would have occurred had the purchases been made as of the beginning of the periods presented or of the results of operations that may occur in the future.

In November 2009, the company acquired a majority interest in the water treatment business of Tianlong Holding Co. Ltd. (Tianlong) of Hong Kong, with operations based in Shanghai, China. A newly formed company, A. O. Smith (Shanghai) Water Treatment Products Co., Ltd. (SWT), holds the assets of the business, which manufactures and supplies reverse osmosis units and other water treatment products to the China residential and commercial markets as well as export markets around the world.

The company acquired an 80 percent interest in SWT at a total cost of $76.7 million, including fixed future payments of $5.7 million, subject to reductions for claims the company may make if there are any breaches of the representations and warranties made by the selling shareholder under the acquisition agreement. As required under ASC 805 the company recorded 100% of the fair value of the assets and liabilities as of the date of acquisition, with the 20 percent noncontrolling interest recorded in the equity section of the company's balance sheet. The acquisition value exceeded the fair value of the assets acquired by $90.6 million, of which $55.4 million was recorded as goodwill and $42.2 million was recorded as intangible assets in the Rest of World segment. In addition, $7.0 million of deferred tax liabilities associated with the intangible assets were recorded. In 2010, the company made a goodwill adjustment of $1.1 million related to an inventory valuation. The company purchased the remaining 20 percent interest in SWT for $6 million from its former partner in the fourth quarter of 2010 and the company now owns 100 percent of SWT. The difference between the amount paid and the carrying value of the noncontrolling interest was recorded to additional paid-in capital. The $5.7 million future payment mentioned above was not paid due to breaches of representations and warranties and was recognized as a gain as part of a settlement with the former owner (see Note 4).

In July 2010, the company purchased the U.S. assets and the right to market and sell tankless water heaters in North America from Takagi Industrial Co, Ltd (Takagi) of Fuji-city, Shizuoka, Japan for $5.5 million. Through the venture, the company offers a full line of tankless water heaters under its own brands in association with the Takagi brand. Takagi is included in the North America segment.

In the fourth quarter of 2010, the company purchased the remaining 50 percent share of its China joint venture that manufactures combi-boilers for the residential market in China for $0.3 million. The joint venture was formed in December, 2007.

In April 2009, the company acquired the assets of Applied Energy Recovery Systems Inc. (AERS), a manufacturer of commercial and residential heat pump water heater products located in Norcross, Ga. The purchase price for the assets totaled $0.7 million, including a fixed payment of $0.1 million made in 2010 and contingent future payments totaling $0.2 million due during the period 2010 through 2013 based on achievement of sales projections. No contingent payments were made in 2011 or 2010. All future payments are subject to reductions for claims the company may make if there are any breaches of the representations and warranties made by the seller under the asset purchase agreement. The purchase price exceeded the fair value of the assets acquired by $0.5 million which was recorded as goodwill. AERS is included in the North America segment.

The acquisitions were accounted for under the purchase accounting method, and accordingly, the results of operations are included in the company's financial statements from the date of acquisition.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Restructuring, Impairment, Other Charges And Settlement Income

12 Months Ended

Dec. 31, 2011

Restructuring, Impairment, Other Charges And Settlement Income [Abstract]

Restructuring, Impairment, Other Charges And Settlement Income

4. Restructuring, Impairment, Other Charges and Settlement Income

Restructuring, Impairment and Settlement Income, Net

On May 5, 2011, the company entered into an agreement settling a legal action that the company commenced on June 30, 2009, in Tennessee State Court, seeking recovery for costs and damages due to an issue with a component part supplied by the vendor. Under the terms of the settlement agreement, the vendor and the vendor's supplier made a $35.5 million cash payment to the company. The settlement reimbursed the company for past costs previously incurred, satisfied in full a receivable recorded by the company, and the company increased its reserve for future costs associated with the affected components on company products by $7.5 million. In the second quarter of 2011, the company recorded a pretax gain of $11.2 million for the reimbursement of related costs incurred in prior years. This activity is included in the North America segment.

Also in the second quarter of 2011, the company recorded an $8.2 million warranty provision to reflect an estimate of expenses that it will likely incur in the future related to a similar component issue in Canada. On June 14, 2011, the company commenced legal action in the United States District Court for the Eastern District of Missouri against certain suppliers seeking recovery of increased costs and damages that the company incurred or will incur due to the issue in Canada. The company has not recorded any adjustments to its provision due to the early status of the legal action. These charges are included in the North America segment.

In 2010, the company recognized a $3.3 million impairment charge related to SWT's trademarks. The company announced plans to move the water treatment operations to Nanjing, China to recognize synergies associated with the company's strong management team and the engineering center in place at the company's water heater operations in that city. A restructuring charge of $1.8 million was recognized relative to the move for severance, lease termination and asset impairment costs. The charges were largely offset by a $5.0 million gain on settlement of disputes with the prior owner relative to breaches of representations and warranties regarding the condition of SWT on the date of purchase. This activity is included in Rest of World segment.

The following table presents an analysis of the company's restructuring, impairment and settlement reserve as of and for the years ended December 31, 2011 and 2010 (dollars in millions):


	Severance Costs			Intangible Impairment			Settlement Income			Other			Total
Balance at December 31, 2009	$	-		$	-		$	-		$	-		$	-
Expense (income) recognized		1.1			3.3			(5.0	)		0.7			0.1
Intangible asset write-down		-			(3.3	)		-			(0.1	)		(3.4	)
Settlement income		-			-			5.0			-			5.0

Balance at December 31, 2010	$	1.1		$	-		$	-		$	0.6		$	1.7
Cash payments		(1.1	)		-			-			(0.6	)		(1.7	)
Income recognized		-			-			(11.2	)		-			(11.2	)
Settlement income		-			-			11.2			-			11.2

Balance at December 31, 2011	$	-		$	-		$	-		$	-		$	-

Other Charges – Tower Automotive, Inc.

The company was the primary lessee on a facility lease in Corydon, Indiana related to a business sold to Tower Automotive, Inc. (Tower) in 1997. The company entered into a sublease arrangement with Tower in 1997 with the same terms and conditions as the company's lease. Tower filed for bankruptcy on February 2, 2005 and subsequently notified the company that it would reject the sublease arrangement effective October 1, 2005. In order to minimize costs, the company purchased the Corydon facility for $4.5 million on October 11, 2005. On March 26, 2009, the company sold the Corydon facility for $2.0 million which resulted in a $0.9 million loss that was recognized at the time of the sale.

Other Charges

The company recognized $0.4 million of expense in 2009, associated with retained liabilities of previously owned businesses which were sold by the company between 1997 and 2001. The majority of the $0.4 million recognized in 2009 is related to ongoing environmental liabilities.

Statement Of Cash Flows

12 Months Ended

Dec. 31, 2011

Statement Of Cash Flows [Abstract]

Statement Of Cash Flows

5. Statement of Cash Flows

Supplemental cash flow information is as follows:


Years ended December 31 (dollars in millions)	2011			2010			2009
Net change in current assets and liabilities, net of acquisitions:
Receivables	$	(28.1	)	$	(33.2	)	$	(10.5	)
Inventories		4.7			(32.0	)		17.0
Other current assets		(4.5	)		(1.5	)		(1.0	)
Trade payables		27.4			23.3			40.8
Accrued liabilities, including payroll and benefits		5.8			(0.7	)		6.4
Income taxes payable		2.7			6.6			(5.9	)

	$	8.0		$	(37.5	)	$	46.8

Inventories

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Inventories

6. Inventories


December 31 (dollars in millions)	2011		2010
Finished products	$	85.6	$	72.7
Work in process		10.6		14.4
Raw materials		98.9		82.7

Inventories, at FIFO cost		195.1		169.8
LIFO reserve		26.7		23.0

	$	168.4	$	146.8

The company recognized after-tax LIFO expense (income) of $0.4 million, $0.3 million and $(0.6) million in 2011, 2010 and 2009, respectively.

Property, Plant And Equipment

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment [Abstract]

Property, Plant And Equipment

7. Property, Plant and Equipment


December 31 (dollars in millions)	2011		2010
Land	$	11.7	$	9.2
Buildings		166.8		121.8
Equipment		418.7		377.9
Software		16.8		16.0

		614.0		524.9
Less accumulated depreciation and amortization		298.7		266.5

	$	315.3	$	258.4

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Goodwill And Other Intangible Assets

12 Months Ended

Dec. 31, 2011

Goodwill And Other Intangible Assets [Abstract]

Goodwill And Other Intangible Assets

8. Goodwill and Other Intangible Assets

Changes in the carrying amount of goodwill during the years ended December 31, 2011 and 2010, consisted of the following:


(dollars in millions)	North America			Rest of World			Total
Balance at December 31, 2009	$	264.6		$	55.3		$	319.9
Acquisition of businesses (see Note 3)		-			1.1			1.1
Currency translation adjustment		2.8			-			2.8

Balance at December 31, 2010		267.4			56.4			323.8
Acquisition of businesses (see Note 3)		108.8			2.6			111.4
Currency translation adjustment		(1.3	)		(0.1	)		(1.4	)

Balance at December 31, 2011	$	374.9		$	58.9		$	433.8

The carrying amount of other intangible assets consisted of the following:


	2011							2010
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Amortizable intangible assets
Patents	$	6.8	$	(3.6	)	$	3.2	$	6.6	$	(2.8	)	$	3.8
Customer lists		231.0		(27.4	)		203.6		78.6		(18.6	)		60.0

Total amortizable intangible assets		237.8		(31.0	)		206.8		85.1		(21.4	)		63.7
Indefinite-lived intangible assets
Trade names		145.9		-			145.9		42.9		-			42.9

Total intangible assets	$	383.7	$	(31.0	)	$	352.7	$	128.0	$	(21.4	)	$	106.6

Amortization of other intangible assets of $9.6 million, $7.1 million, and $3.9 million was recorded in 2011, 2010 and 2009, respectively. In the future, amortization should approximate $14.7 million annually and the intangible assets will be amortized over a weighted average period of 17 years.

As a result of the sale of EPC and change in management reporting, the company reconsidered its segment reporting in the fourth quarter of 2011. These changes did not have a significant impact on how the company evaluates goodwill or other intangible assets for impairment. The company concluded that no goodwill impairment existed at the time of the annual impairment tests which were performed in the fourth quarters of 2011, 2010 and 2009. In 2010, the company recognized an intangible asset impairment charge related to SWT of $3.3 million (see Note 4). No impairments of other intangible assets were recorded in 2011 and 2009.

Debt And Lease Commitments

12 Months Ended

Dec. 31, 2011

Debt And Lease Commitments [Abstract]

Debt And Lease Commitments

9. Debt and Lease Commitments


December 31 (dollars in millions)	2011		2010
Bank credit lines, average year-end interest rate of 6.8% for 2011 and 5.1% for 2010	$	6.2	$	6.5
Revolving credit agreement borrowings, average year-end interest rate of 1.8% for 2011 and 2010		330.0		115.0
Commercial paper, average year-end interest rate of 1.3% for 2011		27.7		-
Term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.9% for 2011 and 2010		68.3		86.9
Canadian revolving credit agreement borrowings, average year-end interest rate of 2.7% for 2010		-		22.6
Canadian term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.3% for 2011 and 2010		29.4		30.0

		461.6		261.0
Less long-term debt due within one year		18.6		18.6

Long-term debt	$	443.0	$	242.4

The company has a $425 million multi-year multi-currency revolving credit agreement with a group of eight banks, which expires on November 13, 2013. The facility has an accordion provision which allows it to be increased up to $525 million if certain conditions (including lender approval) are satisfied. Borrowings under the company's bank credit lines and commercial paper borrowings are supported by the revolving credit agreement. As a result of the long-term nature of this facility, the commercial paper and credit line borrowings are classified as long-term debt at December 31, 2011 and 2010. At its option, the company maintains either cash balances or pays fees for bank credit and services.

Scheduled maturities of long-term debt within each of the five years subsequent to December 31, 2011, are as follows:


Years ending December 31 (dollars in millions)	Amount
2012	$	18.6
2013		382.5
2014		14.4
2015		14.4
2016		14.4

Future minimum payments under non-cancelable operating leases relating mostly to office, manufacturing and warehouse facilities total $50.5 million and are due as follows


Years ending December 31 (dollars in millions)	Amount
2012	$	12.4
2013		8.6
2014		7.5
2015		6.5
2016		4.6
Thereafter		10.9

Rent expense, including payments under operating leases, was $16.1 million, $13.9 million and $12.3 million in 2011, 2010 and 2009, respectively.

Interest paid by the company including discontinued operations was $11.5 million, $10.5 million and $11.9 million in 2011, 2010 and 2009, respectively.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Stockholders' Equity

12 Months Ended

Dec. 31, 2011

Stockholders' Equity [Abstract]

Stockholders' Equity

10. Stockholders' Equity

The stockholders' equity presented in the consolidated financial statements has been impacted by the accounting treatment of the company's transaction with SICO which closed on April 22, 2009 and is discussed in more detail in Note 1 to the Notes to Consolidated Financial Statements. The primary impact on stockholders' equity is that the accounting rules require the presentation of SICO's stockholders' equity prior to the transaction. Subsequent to the transaction, A. O. Smith Corporation stockholders' equity activity is presented.

SICO's authorized capital consisted of 10 million shares of Common Stock $.10 par value.

The company's authorized capital consists of 3 million shares of Preferred Stock $1 par value, 14 million shares of Class A Common Stock $5 par value, and 60 million shares of Common Stock $1 par value. The Common Stock has equal dividend rights with Class A Common Stock and is entitled, as a class, to elect one-third of the Board of Directors and has 1/10th vote per share on all other matters. Class A Common Stock is convertible to Common Stock on a one for one basis.

During 2011, 2010 and 2009, there were 230,957, 364,520 and 4,365,845 shares, respectively, of Class A Common Stock converted into Common Stock. Regular dividends paid on the A. O. Smith Corporation Class A Common Stock and Common Stock amounted to $0.60, $0.54 and $0.51 per share in 2011, 2010 and 2009, respectively.

In December 2007, the company's Board of Directors authorized, and ratified on December 14, 2010, the purchase of 1.5 million shares of its outstanding Common Stock. 611,589 shares were purchased in 2011 at a total cost of $23.5 million. No shares were purchased in 2010 and 2009.

At December 31, 2011, 32,595 and 1,817,815 shares of Class A Common Stock and Common Stock, respectively, were held as treasury stock. At December 31, 2010, 32,595 and 1,811,199 shares of Class A Common Stock and Common Stock, respectively, were held as treasury stock.

Accumulated other comprehensive loss is as follows:


December 31 (dollars in millions)	2011			2010
Cumulative foreign currency translation adjustments	$	16.5		$	23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)		(0.3	)		10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)		(318.3	)		(263.8	)
Unrealized net gain on investments less related income tax provision of $(0.7)		1.2			-


	$	(300.9	)	$	(229.4	)

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Stock Based Compensation

12 Months Ended

Dec. 31, 2011

Stock Based Compensation [Abstract]

Stock Based Compensation

11. Stock Based Compensation

The company adopted the A. O. Smith Combined Incentive Compensation Plan (the "plan") effective January 1, 2007. The plan is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by shareholders in 2002. At the company's annual meeting of stockholders on April 14, 2009, an amendment to the plan was approved to increase the authorized shares of Common Stock under the plan by 1,875,000. The number of shares available for granting of options or share units at December 31, 2011, was 1,918,931. Upon stock option exercise, restricted stock grant, or share unit vesting, shares are issued from Treasury stock.

Total stock based compensation cost from continuing operations recognized in 2011, 2010 and 2009 was $5.7 million, $5.4 million and $5.1 million, respectively.

Stock options

The stock options granted in 2011, 2010 and 2009 have a three year pro rata vesting from the date of grant. Stock options are issued at exercise prices equal to the fair value of Common Stock on the date of grant. For active employees, all options granted in 2011, 2010 and 2009 expire ten years after date of grant. Stock option compensation recognized in 2011, 2010 and 2009 was $2.8 million, $2.2 million and $2.2 million, respectively. Included in the stock option expense recognized in 2011, 2010 and 2009 is expense associated with the accelerated vesting of stock option awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

Changes in option shares, all of which are Common Stock, were as follows:


	Weighted-Avg. Per Share		Years Ended December 31									(dollars in millions) Aggregate Intrinsic Value
	Exercise Price		2011			2010			2009

Outstanding at beginning of year		$22.17		1,623,101			1,630,751			1,933,601
Granted
2011—$43.12 to $44.12 per share				178,200
2010—$27.93 per share							237,000
2009—$16.40 to $21.66 per share										506,400
Exercised
2011—$15.99 to $27.93 per share				(364,081	)								$ 7.7
2010—$9.04 to $25.84 per share							(240,801	)					3.3
2009—$9.04 to $19.47 per share										(809,250	)		8.1
Forfeited
2011—$19.00 to $43.12 per share				(15,353	)
2010—$19.00 to $27.93 per share							(3,849	)

Outstanding at end of year
(2011—$15.99 to $44.12 per share)		24.84		1,421,867			1,623,101			1,630,751

Exercisable at end of year		22.23		989,933			951,035			831,401

The aggregate intrinsic value for the outstanding and exercisable options as of December 31, 2011 is $20.0 million and $18.2 million, respectively. The average remaining contractual life for outstanding and exercisable options is eight years and seven years, respectively.

The following table summarizes weighted-average information by range of exercise prices for stock options outstanding and exercisable at December 31, 2011:


Range of Exercise Prices	Options Outstanding at December 31, 2011	Weighted- Average Exercise Price	Options Exercisable at December 31, 2011	Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Life
$15.99 to $19.47	561,349	$ 18.86	426,899	$ 18.85	7 years
$21.34 to $24.02	298,401	23.18	294,851	23.20	7 years
$25.84 to $43.12	562,117	31.67	268,183	26.53	8 years

	1,421,867		989,933

The weighted-average fair value per option at the date of grant during 2011, 2010 and 2009, using the Black-Scholes option-pricing model, was $16.51, $10.19 and $5.47, respectively. Assumptions were as follows:


	2011		2010		2009
Expected life (years)		6.4		6.4		6.4
Risk-free interest rate		3.6%		3.6%		2.8%
Dividend yield		1.3%		1.9%		2.8%
Expected volatility		38.4%		38.7%		35.0%

The expected life is based on historical exercise behavior and the projected exercise of unexercised stock options. The risk free interest rate is based on the U.S. Treasury yield curve in effect on the date of grant for the respective expected life of the option. The expected dividend yield is based on the expected annual dividends divided by the grant date market value of our common stock. The expected volatility is based on the historical volatility of our common stock.

Restricted stock and share units

Participants may also be awarded shares of restricted stock or share units under the plan. The company granted 75,625, 101,873 and 159,801 share units under the plan in 2011, 2010 and 2009, respectively. Compensation expense was recognized ratably over the vesting period.

The share units were valued at $3.3 million, $2.9 million and $3.0 million at the date of issuance in 2011, 2010 and 2009, respectively, and will be recognized as compensation expense ratably over the three-year vesting period. Compensation expense of $2.9 million, $3.2 million and $2.9 million was recognized in 2011, 2010 and 2009, respectively. Included in share based compensation is expense associated with the accelerated vesting of share unit awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

A summary of share unit activity under the plan is as follows:


	Number of Units			Weighted-Average Grant Date Value
Outstanding at January 1, 2011		473,438		$22.43

Granted		75,625		43.12

Vested		(233,702	)	22.72

Forfeited/cancelled		(28,807	)	25.28


Outstanding at December 31, 2011		286,554		$27.36

Total compensation expense for share units not yet recognized is $3.2 million at December 31, 2011. The weighted average period over which the expense is expected to be recognized is ten months.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Pension And Other Post-Retirement Benefits

12 Months Ended

Dec. 31, 2011

Pension And Other Post-Retirement Benefits [Abstract]

Pension And Other Post-Retirement Benefits

12. Pension and Other Post-retirement Benefits

The company provides retirement benefits for all United States employees including benefits for employees of previously owned businesses which were earned up to the date of sale. The company also has several foreign pension plans, none of which are material to the company's financial position.

The company had a defined contribution profit sharing and retirement plan covering the majority of its salaried nonunion employees which provided for annual company contributions of 35 percent to 140 percent of qualifying contributions made by participating employees. This plan was terminated on December 31, 2009 and was replaced by a plan which matches 100 percent of the first one percent of contributions made by participating employees and matches 50 percent of the next five percent of employee contributions. The new plan became effective on January 1, 2010. The company also has defined contribution plans for certain hourly employees which provide for matching company contributions.

The company also has a defined benefit plan for salaried employees and its non-union hourly workforce. In the fourth quarter of 2009, the company announced employees hired after Jan. 1, 2010, will not participate in the defined benefit plan, and benefit accruals for current salaried and non-union hourly employees will stop at the end of 2014. This change resulted in a plan curtailment and reduced the plan's liability by $12.3 million. No curtailment gain was recognized because the reduction in liability was offset by existing unrecognized losses. An additional company contribution will be made to the defined contribution plan in lieu of participation in a defined benefit plan. The company also has defined benefit and contribution plans for certain union hourly employees.

The company has unfunded defined-benefit post-retirement plans covering certain hourly and salaried employees that provide medical and life insurance benefits from retirement to age 65. Certain hourly employees retiring after January 1, 1996, are subject to a maximum annual benefit and salaried employees hired after December 31, 1993, are not eligible for post-retirement medical benefits.

Obligations and Funded Status

Pension and Post-Retirement Disclosure Information Under ASC 715

The following tables present the changes in benefit obligations, plan assets and funded status for domestic pension and post-retirement plans and the components of net periodic benefit costs.


	Pension Benefits						Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2011			2010
Accumulated Benefit Obligation (ABO) at December 31	$	895.1		$	850.3			N/A			N/A

Change in projected benefit obligations (PBO)
PBO at beginning of year	$	(862.1	)	$	(826.7	)	$	(14.9	)	$	(17.0	)
Service cost		(9.1	)		(8.6	)		(0.1	)		(0.2	)
Interest cost		(44.1	)		(46.7	)		(0.7	)		(0.8	)
Participant contributions		-			-			(0.3	)		(0.4	)
Plan amendments		(1.6	)		-			-			-
Actuarial (loss) gain including assumption changes		(52.0	)		(38.7	)		1.9			2.1
Benefits paid		60.4			58.6			1.4			1.4
Curtailment		2.0			-			-			-

PBO at end of year	$	(906.5	)	$	(862.1	)	$	(12.7	)	$	(14.9	)

Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	640.8		$	594.0		$	-		$	-
Actual return on plan assets		11.3			74.8			-			-
Contribution by the company		176.9			30.6			1.1			1.0
Participant contributions		-			-			0.3			0.4
Benefits paid		(60.4	)		(58.6	)		(1.4	)		(1.4	)

Plan assets at end of year	$	768.6		$	640.8		$	-		$	-

Funded status	$	(137.9	)	$	(221.3	)	$	(12.7	)	$	(14.9	)
Amount recognized in the balance sheet
Current liabilities	$	-		$	-		$	(1.1	)	$	(1.3	)
Non-current liabilities		(137.9	)		(221.3	)		(11.6	)		(13.6	)

Net pension liability at end of year	$	(137.9	)*	$	(221.3	)*	$	(12.7	)	$	(14.9	)

Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	532.0		$	447.2		$	(2.8	)	$	(3.3	)
Prior service cost		(8.9	)		(12.7	)		-			-

Total recognized in accumulated other comprehensive loss	$	523.1		$	434.5		$	(2.8	)	$	(3.3	)

*	In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.


	Pension Benefits									Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
Net periodic benefit cost
Service cost	$	9.1		$	8.6		$	8.4		$	0.2		$	0.2		$	0.2
Interest cost		44.2			46.7			49.8			0.7			0.8			1.0
Expected return on plan assets		(70.6	)		(61.6	)		(60.8	)		-			-			-
Amortization of unrecognized:
Net actuarial loss		24.4			17.7			10.6			(0.4	)		(0.4	)		-
Prior service cost		(0.9	)		(0.9	)		0.3			-			-			-
Curtailment and other one-time charges		(1.3	)		-			-			(2.1	)		-			-

Defined-benefit plan cost		4.9			10.5			8.3		$	(1.6	)	$	0.6		$	1.2

Various U.S. defined contribution plans cost		5.6			5.8			6.5

	$	10.5	*	$	16.3	*	$	14.8	*

Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	109.3		$	25.4		$	34.8		$	0.2		$	(2.1	)	$	-
Amortization of net actuarial (loss) gain		(24.4	)		(17.7	)		(10.6	)		0.4			0.4			-
Prior service cost		2.8			-			(12.4	)								-
Amortization of prior service cost		0.9			0.9			(0.3	)		(0.1	)		(0.1	)		-

Total recognized in other comprehensive earnings		88.6			8.6			11.5			0.5			(1.8	)		-

Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	$	93.5		$	19.1		$	19.8		$	(1.1	)	$	(1.2	)	$	1.2

The estimated net actuarial loss and prior service cost for the pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2012 are $31.8 million and $(0.9) million, respectively. The estimated net actuarial loss and prior year service cost for the post-retirement benefit plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2012 are each less than $0.3 million. As permitted under ASC 715, (formerly SFAS 87 and paragraph 53 of SFAS 106), the amortization of any prior service cost is determined using a straight-line amortization of the cost over the average remaining service period of employees expected to receive benefits under the plan.

The 2011 and 2010 after tax adjustments for additional minimum pension liability resulted in other comprehensive loss of $54.5 million and $5.6 million, respectively.

*	Includes $(1.6) million, $0 million and $0.5 million of defined benefit plan (expense) income and $0.9 million, $1.2 million and $1.7 million of defined contribution plans expense that were included in earnings from discontinued operations for 2011, 2010 and 2009, respectively.

Assumptions

Actuarial assumptions used to determine benefit obligations at December 31 are as follows:


	Pension Benefits						Post-retirement Benefits
	2011			2010			2011			2010
Discount rate		4.90	%		5.35	%		4.90	%		5.35	%
Average salary increases		4.00	%		4.00	%		4.00	%		4.00	%

Actuarial assumptions used to determine net periodic benefit cost for the year ended December 31 are as follows:


	Pension Benefits									Post-retirement Benefits
Years ended December 31	2011			2010			2009			2011			2010			2009
Discount rate		5.35	%		5.80	%		6.60	%		5.35	%		5.80	%		6.60	%
Expected long-term return on plan assets		8.75	%		8.75	%		8.75	%		n/a			n/a			n/a
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%

In developing the expected long-term rate of return assumption, the company evaluated its pension plan's target and actual asset allocation and expected long-term rates of return of equity and bond indices. The company also considered its pension plan's historical ten-year and 25-year compounded annualized returns of 5.5 percent and 9.2 percent, respectively.

Assumed health care cost trend rates

Assumed health care cost trend rates as of December 31 are as follows:


	2011			2010
Health care cost trend rate assumed for next year		10.00	%		10.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%
Year that the rate reaches the ultimate trend rate		2016			2015

A one-percentage-point change in the assumed health care cost trend rates would not result in a material impact on the company's consolidated financial statements.

Plan Assets

The company's pension plan weighted asset allocations as of December 31 by asset category are as follows:


Asset Category	2011			2010
Equity securities		55	%		62	%
Debt securities		37			30
Private equity		5			6
Other		3			2

		100	%		100	%

The following tables present the fair value measurement of the company's plan assets as of December 31, 2011 and 2010 (dollars in millions)


			December 31, 2011
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)

Short-term investments	$	39.7	$	-	$	-	$	39.7

Equity Securities
Common stocks		267.6		267.6		-		-
Preferred stocks		-		-		-		-
Commingled equity funds		146.1		-		146.1		-

Fixed Income Securities
U.S. Treasury securities		74.8		74.8		-		-
Government agency securities		3.7		-		3.7		-
Corporate asset backed securities		0.2		-		0.2		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		1.2		-		1.2		-
Other fixed income securities		92.4		-		92.2		0.2
Commingled fixed income funds		106.6		-		106.6		-

Other types of investments
Private equity		34.7		-		-		34.7


Total fair value of plan asset investments	$	767.0	$	342.4	$	350.0	$	74.6

Non-investment plan assets		2.0

Total plan assets	$	769.0


			December 31, 2010
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)

Short-term investments	$	12.8	$	-	$	0.1	$	12.7

Equity Securities
Common stocks		279.0		279.0		-		-
Preferred stocks		0.1		0.1		-		-
Commingled equity funds		121.3		-		121.3		-

Fixed Income Securities
U.S. Treasury securities		42.2		42.2		-		-
Government agency securities		6.5		-		6.5		-
Corporate asset backed securities		3.1		-		3.1		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		2.4		-		2.4		-
Other fixed income securities		31.1		-		30.9		0.2
Commingled fixed income funds		104.1		-		104.1		-

Other types of investments
Private equity		37.7		-		-		37.7


Total fair value of plan asset investments	$	640.3	$	321.3	$	268.4	$	50.6

Non-investment plan assets		0.5

Total plan assets	$	640.8

The following table presents a reconciliation of the fair value measurements using significant unobservable inputs (Level 3) as of December 31, 2011 and 2010 (dollars in millions):


	Short Term Investments		Other Fixed Income Securities		Private Equity			Total
Balance at December 31, 2009	$	28.2	$	0.2	$	29.4		$	57.6

Actual return (loss) on plan assets:
Relating to assets still held at the reporting date		-		-		4.0			4.0
Relating to assets sold during the period		-		-		(0.1	)		(0.1	)
Purchases, sales and settlements		27.0		-		4.4			(11.1	)
Transfers in and/or out of Level 3		-		0.2		-			0.2

Balance at December 31, 2010	$	12.7	$	0.2	$	37.7		$	50.6
Actual (loss) return on plan assets:
Relating to assets still held at the reporting date		-		-		(4.4	)		(4.4	)
Relating to assets sold during the period		-		-		9.8			9.8
Purchases, sales and settlements		27.0		-		(8.4	)		18.6

Balance at December 31, 2011	$	39.7	$	0.2	$	34.7		$	74.6

The company's investment policies employ an approach whereby a diversified blend of equity and bond investments is used to maximize the long-term return of plan assets for a prudent level of risk. Equity investments are diversified across domestic and non-domestic stocks, as well as growth, value, and small to large capitalizations. Bond investments include corporate and government issues, with short-, mid- and long-term maturities, with a focus on investment grade when purchased. The company's current allocation to equity managers is between 50 to 60 percent with the remainder allocated primarily to bonds and a small allocation to private equity managers and cash. Investment and market risks are measured and monitored on an ongoing basis through regular investment portfolio reviews, annual liability measurements and periodic asset/liability studies.

The company's actual asset allocations are in line with target allocations. The company regularly reviews its actual asset allocation and periodically rebalances its investments to the targeted allocation when considered appropriate.

There were 48,590 shares of the company's Class A Common Stock and 9,388 shares of Common Stock included in plan assets at December 31, 2011. The total market value of these shares at December 31, 2011 is $2.3 million.

Cash Flows

In 2011, the company made contributions of $175.0 million and is not required to make a contribution in 2012.

Estimated Future Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:


Years ending December 31 (dollars in millions)	Pension Benefits	Post-retirement Benefits
2012	$ 59.8	$ 1.0
2013	60.1	1.0
2014	60.1	1.0
2015	60.6	0.9
2016	60.8	0.9
2017 – 2021	306.9	4.2

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Investment In RBC Shares	12 Months Ended
Investment In RBC Shares	Dec. 31, 2011
Investment In RBC Shares [Abstract]
Investment In RBC Shares	13. Investment in RBC Shares As discussed in Note 2, the company received approximately 2.83 million of RBC shares as a part of the proceeds of its sale of EPC to RBC. The value of those shares at December 31, 2011 was $144.4 million. One half of the RBC shares are classified as available for sale securities and are recorded at fair value with the unrealized after-tax gain of $1.2 million included in other comprehensive loss. The company entered into an equity collar contract for the remaining half of the RBC shares that are classified as trading securities. The shares are recorded at fair value with the unrealized pretax gain of $1.9 million included in earnings and classified as other (income) expense–net, in the consolidated statements of earnings. See Note 1 for further discussion regarding the collar. The shares that the company received from RBC on August 22, 2011 are restricted securities under the Securities Act of 1933, as amended (the "Securities Act"). Subject to certain conditions included in the Shareholders Agreement, the company may sell the RBC shares at prices and on terms to be determined at or prior to the time of sale pursuant to a shelf registration statement that became effective upon filing with the SEC on November 10, 2011. In addition, under Rule 144 under the Securities Act as currently in effect, a person who acquired shares of common stock from the issuer and who has beneficially owned the shares of common stock for at least six months is entitled to sell such shares of common stock without registration under the Securities Act, so long as (i) such person is not deemed to have been the issuer's affiliate at the time of, or at any time during three months preceding, the sale and (ii) the issuer has filed all required reports under Section 13 or 15(d) of the Exchange Act, as applicable, during the twelve months preceding such sale (other than current reports on Form 8-K).

- Definition

Tabular disclosure of investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Paragraph 2
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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-Paragraph 6
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-Paragraph 5
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901
-Topic 320

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Equity Security
-URI http://asc.fasb.org/extlink&oid=6511694
-Topic 320

+ Details

Ashland City, TN Facility Flood

12 Months Ended

Dec. 31, 2011

Ashland City, TN Facility Flood [Abstract]

Ashland City, TN Facility Flood

14. Ashland City, TN Facility Flood

Starting May 3, 2010, production at the company's largest water heater manufacturing plant located in Ashland City, TN was temporarily shut down due to flooding of the Cumberland River. Water heater production was shifted to other company plants located in the United States, Canada and Mexico. The company resumed production at the Ashland City, TN plant in June 2010. Impact from the flood was essentially completed by year end 2010.

As of December 31, 2010, the company recorded flood related expense of $35.4 million, net of insurance proceeds, consisting of the following:


(dollars in millions)
Repair or write off of buildings and equipment	$	36.1
Net inventory loss		16.4
Site cleanup and restoration		14.8

		67.3
Less: insurance proceeds		31.9

Total flood related expense	$	35.4

The buildings and equipment of the Ashland City, TN plant sustained damages due to the flooding. As of December 31, 2010, restoration of manufacturing equipment was complete and office space was nearing completion. The carrying value of fixed assets destroyed in the flood was written off, totaling $14.0 million. An additional $22.1 million was expensed to repair and refurbish damaged equipment to pre-flood condition.

The net inventory loss, totaling $16.4 million, included the cost of raw materials, work-in-process and finished good inventories that were not able to be used or sold due to flood damage.

Site cleanup and restoration began as soon as the flood waters subsided. The company engaged outside contractors to pump out water and clean and sanitize the facilities and the grounds of the manufacturing facility prior to access by company personnel. Employees normally engaged in the production of water heaters were utilized in the cleanup and repair of the facility and equipment, assessment and recovery of inventories and other aspects of the site restoration. Internal and external costs associated with site restoration and cleanup totaled $14.8 million.

Insurance proceeds

In 2010, the company maintained property damage and business interruption insurance coverage applicable to its Ashland City, TN plant totaling $30 million. The company also had federal flood insurance policies and $1.9 million was recovered. As of December 31, 2010 the company had received insurance proceeds of $31.9 million.

Government Assistance

In addition, the company received assistance from the State of Tennessee as well as local governmental agencies as incentive to reinvest in the Ashland City facility. Those incentives were in the form of grants, future tax credits and the purchase of certain property. The benefits, collectively, totaled approximately $7 million in 2010, of which $1.4 million of income was recorded in cost of goods sold in the third quarter of 2010. In the fourth quarter of 2010, $5.6 million was recorded including $1.3 million in cost of goods sold, $2.3 million in other income and $2.0 million as an offset to direct flood related expenses.

Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

15. Income Taxes

The components of the provision for income taxes from continuing operations consisted of the following:


Years ended December 31 (dollars in millions)	2011			2010			2009
Current:
Federal	$	(28.0	)	$	(2.9	)	$	16.0
State		(5.2	)		2.4			2.9
International		4.9			14.1			12.9
Deferred:
Federal		63.3			7.0			3.2
State		11.9			0.5			(1.1	)
International		3.4			(3.8	)		(3.0	)

	$	50.3		$	17.3		$	30.9

The provision for income taxes differs from the U.S. federal statutory rate due to the following items:


Years ended December 31	2011			2010			2009
Provision at U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State income and franchise taxes, net of federal benefit		3.2			1.6			2.9
International income tax rate differential		(4.3	)		(13.4	)		(6.2	)
Research tax credits		(0.6	)		(0.4	)		(0.7	)
State tax credits		(2.3	)		-			-
Other		0.1			0.5			2.7

		31.1	%		23.3	%		33.7	%

Components of earnings from continuing operations before income taxes were as follows:


Years ended December 31 (dollars in millions)	2011		2010		2009
United States	$	117.8	$	12.4	$	48.9
International		43.7		62.0		42.9

	$	161.5	$	74.4	$	91.8

Total income taxes paid by the company including discontinued operations amounted to $117.2 million, $12.3 million, and $5.6 million in 2011, 2010 and 2009, respectively.

During 2011, the company determined that certain undistributed foreign earnings associated with the proceeds from the sale of EPC in foreign jurisdictions were not considered permanently reinvested. Concurrent with the sale of EPC, the company recorded a U.S. tax provision of $56.5 million in discontinued operations for U.S. income taxes on those foreign earnings. At December 31, 2011, the company had undistributed foreign earnings of $633.9 million, of which $377.8 million are considered permanently reinvested. No U.S. income tax provision or foreign withholding tax provisions have been made on foreign earnings that remain permanently reinvested. Determination of the amount of unrecognized deferred tax liability on the undistributed earnings considered permanently reinvested is not practicable. In addition, no provision or benefit for U.S. income taxes has been made on foreign currency translation gains or losses. As of December 31, 2011, $463.3 million of cash and cash equivalents were held by our foreign subsidiaries.

The tax effects of temporary differences of assets and liabilities between income tax and financial reporting are as follows:

December 31 (dollars in millions)


	2011					2010
		Assets			Liabilities		Assets			Liabilities
Employee benefits	$	71.5		$	-	$	95.0		$	-
Product liability and warranties		60.6			-		58.9			-
Inventories		-			3.3		-			3.3
Accounts receivable		9.6			-		7.4			-
Property, plant and equipment		-			35.1		-			29.9
Intangibles		-			29.1		-			28.7
Environmental		3.3			-		3.5			-
RBC stock and collar		-			8.5		-			-
Undistributed foreign earnings		-			56.5		-			-
Tax loss and credit carryovers		17.0			-		16.0			-
All other		0.4			-		-			0.1

Valuation allowance		(8.4	)		-		(1.9	)		-


	$	154.0		$	132.5	$	179.0		$	62.0

Net asset				$	21.5				$	117.0

These deferred tax assets and liabilities are classified in the balance sheet as current or long-term based on the balance sheet classification of the related assets and liabilities as follows:


December 31 (dollars in millions)	2011			2010
Current deferred income tax assets	$	24.6		$	27.3
Long-term deferred income tax (liabilities) assets		(3.1	)		89.7


Net asset	$	21.5		$	117.0

A reconciliation of the beginning and ending amounts of tax loss carryovers, credit carryovers and valuation allowances follows:

December 31 (dollars in millions)


	Net Operating Losses and Tax Credits					Valuation Allowances
	2011			2010		2011			2010
Beginning balance	$	16.0		$	14.1	$	1.9		$	1.5
Additions		10.3			1.9		6.6			0.4
Reductions		(9.3	)		-		(0.1	)		-

Ending balance	$	17.0		$	16.0	$	8.4		$	1.9

The company has foreign net operating loss carryovers that expire in 2014 through 2019, an alternative minimum tax credit carryover that does not expire, a foreign tax credit carryover that expires in 2021, and state and local net operating loss carryovers that expire between 2012 and 2030.

A reconciliation of the beginning and ending amount of unrecognized benefits is as follows:


(Dollars in millions)	2011			2010
Balance at January 1	$	2.0		$	3.8
Additions based on tax positions related to the current year		-			0.1
Reductions for tax positions of prior years		(0.2	)		(1.9	)

Balance at December 31	$	1.8		$	2.0

The amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate is $1.3 million. The company recognizes potential interest and penalties related to unrecognized tax benefits as a component of tax expense. At December 31, 2011 there was $0.5 million of interest and penalties accrued. There was no net change to the interest and penalty accrual during 2011. It is anticipated there will be a $0.4 million decrease in total amount of unrecognized tax benefits in the next 12 months. The company's U.S. federal income tax returns for 2008-2011 are subject to audit. The company is subject to state and local income tax audits for tax years 2000-2011. The company is subject to non-U.S. income tax examinations for years 2005-2011.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Name Accounting Standards Codification
-Topic 740
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Commitments And Contingencies	12 Months Ended
Commitments And Contingencies	Dec. 31, 2011
Commitments And Contingencies [Abstract]
Commitments And Contingencies	16. Commitments and Contingencies The company is a potentially responsible party in 14 judicial and administrative proceedings initiated on behalf of various state and federal regulatory agencies seeking to clean up sites which have been environmentally impacted and to recover costs they have incurred or will incur as to the sites. The company has established reserves for the sites and insurance proceeds and potential recovery from third parties are available to cover a portion of the company's potential liability. The company believes that any environmental claims for these sites in excess of reserves, insurance proceeds and indemnified amounts will not have a material effect on its financial position or results of operations. The company is subject to various claims and pending lawsuits for product liability and other matters arising out of the conduct of the company's business. With respect to product liability claims, the company has self-insured a portion of its product liability loss exposure for many years. The company has established reserves which it believes are adequate to cover incurred claims. For the years ended December 31, 2011 and 2010, the company had $125 million of product liability insurance for individual losses in excess of $5 million. The company periodically reevaluates its exposure on claims and lawsuits and makes adjustments to its reserves as appropriate. The company believes, based on current knowledge, consultation with counsel, adequate reserves and insurance coverage, that the outcome of such claims and lawsuits will not have a material adverse effect on the company's financial position, results of operations or cash flows.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

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-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Operations By Segment

12 Months Ended

Dec. 31, 2011

Operations By Segment [Abstract]

Operations By Segment

17. Operations by Segment

Prior to the sale of EPC the company had identified two segments, Water Products Company and EPC. As a result of the sale of EPC and a change in management reporting, the company reconsidered its segment reporting in the fourth quarter of 2011 and determined that it is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters, and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing, and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

The accounting policies of the reportable segments are the same as those described in the "Summary of Significant Accounting Policies" outlined in Note 1. Operating earnings, defined by the company as earnings before interest, taxes, general corporate and corporate research and development expenses, was used to measure the performance of the segments.


	Earnings									Net Sales
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
North America	$	154.0		$	91.2		$	115.8		$	1,289.5		$	1,155.4		$	1,135.9
Rest of World		42.7			42.4			33.0			455.6			368.9			256.5
Inter-segment		(0.2	)		(0.7	)		0.1			(34.6	)		(35.0	)		(17.4	)

Total segments – operating earnings	$	196.5		$	132.9		$	148.9		$	1,710.5		$	1,489.3		$	1,375.0


General corporate and research and development expenses		(25.7	)		(51.6	)		(50.3	)
Interest expense		(9.3	)		(6.9	)		(7.2	)


Earnings before income taxes		161.5			74.4			91.4
Provision for income taxes		(50.3	)		(17.3	)		(30.9	)


Earnings from continuing operations	$	111.2		$	57.1		$	60.5

In 2011, sales to the North America segment's two largest customers were $273.1 million and $194.7 million which represent 16 percent and 11 percent of the company's net sales, respectively. In 2010, sales to the North America segment's two largest customers were $237.9 million and $177.3 million which represent 16 percent and 12 percent of the company's net sales, respectively. North America operating earnings includes an equity loss in joint venture of $0.4 million in 2009.

Assets, depreciation and capital expenditures by segment


	Total Assets (December 31)						Depreciation and Amortization (Years Ended December 31)						Capital Expenditures (Years Ended December 31)
(dollars in millions)	2011		2010		2009		2011		2010		2009		2011		2010		2009
North America	$	1,319.2	$	868.3	$	826.9	$	33.9	$	30.2	$	32.2	$	31.6	$	37.8	$	26.9
Rest of World		342.4		299.7		268.5		12.4		10.0		5.6		20.5		13.8		15.1
Corporate assets		687.4		271.0		235.2		0.7		0.6		0.5		1.4		1.9		0.7
EPC discontinued operations		-		671.6		642.4		-		-		-		-		-		-

Total	$	2,349.0	$	2,110.6	$	1,973.0	$	47.0	$	40.8	$	38.3	$	53.5	$	53.5	$	42.7

The majority of corporate assets consist of cash and cash equivalents and deferred income taxes.

Net sales and long-lived assets by geographic location

The following data by geographic area includes net sales based on product shipment destination and long-lived assets based on physical location. Long-lived assets include net property, plant and equipment and other long-term assets and long-lived assets of previously owned businesses.


	Long-lived Assets							Net Sales
(dollars in millions)	2011		2010		2009			2011		2010		2009

United States	$	218.2	$	173.2	$	169.2	United States	$	1,094.3	$	960.4	$	959.0

China		70.7		57.1		53.3	China		382.2		304.4		222.0

Canada		20.9		22.2		22.5	Canada		160.2		160.4		150.4

Other Foreign		32.0		31.2		26.4	Other Foreign		73.8		64.1		43.6


Total	$	341.8	$	283.7	$	271.4	Total	$	1,710.5	$	1,489.3	$	1,375.0

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Quarterly Results Of Operations

12 Months Ended

Dec. 31, 2011

Quarterly Results Of Operations [Abstract]

Quarterly Results Of Operations

18. Quarterly Results of Operations (Unaudited)


(dollars in millions, except per share amounts)
	1st Quarter				2nd Quarter					3rd Quarter				4th Quarter
		2011		2010		2011		2010			2011		2010		2011		2010
Net sales	$	417.4	$	366.7	$	405.3	$	375.0		$	412.0	$	377.4	$	475.8	$	370.2
Gross profit		127.0		108.3		111.9		114.2			118.7		107.2		155.0		116.3
Earnings
Continuing operations		24.2		21.3		28.6		(0.9	)		26.9		16.2		31.5		20.5
Discontinued operations		16.8		9.5		21.7		17.5			155.4		15.8		0.6		11.6

Net earnings		41.0		30.8		50.3		16.6			182.3		32.0		32.1		32.1
Net loss attributable to noncontrolling interest
Continuing operations		-		0.1		-		-			-		-		-		0.1
Discontinued operations		-		-		-		-			-		-		-		-

Net earnings attributable to A. O. Smith Corporation	$	41.0	$	30.9	$	50.3	$	16.6		$	182.3	$	32.0	$	32.1	$	32.2


Basic earnings (loss) per share
Continuing operations		0.52		0.47		0.62		(0.02	)		0.58		0.35		0.68		0.45
Discontinued operations		0.37		0.21		0.47		0.38			3.36		0.35		0.01		0.25

Net		0.89		0.68		1.09		0.36			3.94		0.70		0.69		0.70

Diluted earnings (loss) per share
Continuing operations		0.52		0.46		0.62		(0.02	)		0.58		0.35		0.68		0.44
Discontinued operations		0.36		0.21		0.46		0.38			3.33		0.34		0.01		0.25

Net		0.88		0.67		1.08		0.36			3.91		0.69		0.69		0.69


Common dividends declared		0.14		0.13		0.14		0.13			0.16		0.14		0.16		0.14

Net earnings per share are computed separately for each period and, therefore, the sum of such quarterly per share amounts may differ from the total for the year.

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation And Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

A. O. SMITH CORPORATION

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

(In millions)

Years ended December 31, 2011, 2010 and 2009


Description	Balance at Beginning of Year		Charged to Costs and Expenses¹		Acquisition of Businesses		Deductions²			Balance at End of Year
2011:
Valuation allowance for trade and notes receivable	$	3.5	$	0.8	$	0.3	$	(1.2	)	$	3.4
Valuation allowance for deferred tax assets		1.9		6.6		-		(0.1	)		8.4

2010:
Valuation allowance for trade and notes receivable		3.4		0.2		-		(0.1	)		3.5
Valuation allowance for deferred tax assets		1.5		0.4		-		-			1.9

2009:
Valuation allowance for trade and notes receivable		2.8		1.7		-		(1.1	)		3.4
Valuation allowance for deferred tax assets		0.5		1.0		-		-			1.5

¹	Provision based upon estimated collection.

²	Uncollectible amounts/expenditures or adjustments charged against the reserve.

Organization And Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2011

Organization And Significant Accounting Policies [Abstract]

Organization

Consolidation

Consolidation. The consolidated financial statements include the accounts of the company and its wholly owned subsidiaries after elimination of intercompany transactions.

On April 22, 2009, A. O. Smith Corporation (the company) closed on a merger transaction with Smith Investment Company (SICO). The merger was approved by A. O. Smith's stockholders on April 14, 2009.

Except when otherwise indicated, amounts reflected in the financial statements or the notes thereto relate to the company's continuing operations.

Use Of Estimates

Fair Value Of Financial Instruments

Foreign Currency Translation

Cash And Cash Equivalents

Cash and cash equivalents. The company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Inventory Valuation

Property, Plant And Equipment

Goodwill And Other Intangibles

Impairment Of Long-Lived And Amortizable Intangible Assets

Derivative Instruments

Commodity Futures Contracts

With one of its brokers, the company is required to make cash deposits on unrealized losses on commodity derivative contracts that exceed $10.0 million.

Foreign Currency Forward Contracts

The following table summarizes, by currency, the contractual amounts of the company's foreign currency forward contracts:


December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-

Total	$	32.6	$	37.8	$	11.2	$	37.6

Interest Rate Swap Agreement

Equity Collar Contract

The impact of derivative contracts on the company's financial statements is as follows (dollars in millions):

Fair value of derivative instruments designated as hedging instruments under ASC 815 in continuing operations:


December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1

Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:


December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-

Total derivatives not designated as hedging instruments		$	17.9	$	-

The effect of derivative instruments on the Statement of Earnings for continuing and discontinued operations.

Year ended December 31,


Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-

	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivatived	Amount of gain recognized in earnings from continuing operations on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

Fair Value Measurements

Continuing assets measured at fair value on a recurring basis are as follows (dollars in millions):


Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8

Total Investments and Net Derivative Contracts	$	162.0	$	1.4

There were no changes in our valuation techniques used to measure fair values on a recurring basis as a result of adopting ASC 820.

Revenue Recognition

Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold.

Advertising

Research And Development

Product Warranties

The following table presents the company's product warranty liability activity in 2011 and 2010:


Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)

Balance at end of year	$	131.8		$	112.2

See Note 4 for discussion on the increase in warranty reserve due to settlement and the increase in warranty expense and reserve associated with component issues in Canada.

Environmental Costs

Stock-Based Compensation

Earnings Per Share Of Common Stock


	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599

Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

Reclassifications

Reclassifications. Certain amounts from prior years have been reclassified to conform with current year presentation.

Recent Accounting Pronouncements

Organization And Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Organization And Significant Accounting Policies [Abstract]

Summary Of Foreign Currency Forward Contracts By Currency


December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-

Total	$	32.6	$	37.8	$	11.2	$	37.6

Schedule Of Impact Of Derivative Contracts On The Company's Financial Statements


December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1

Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:


December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-

Total derivatives not designated as hedging instruments		$	17.9	$	-

Schedule Of Effect Of Derivative Instruments On The Statement Of Earnings


Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-

	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivative	Amount of gain recognized in earnings from continuing operations on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

Schedule Of Assets Measured At Fair Value On A Recurring Basis


Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8

Total Investments and Net Derivative Contracts	$	162.0	$	1.4

Schedule Of Product Warranty Liability Activity


Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)

Balance at end of year	$	131.8		$	112.2

Schedule Of Computation Of Basic And Diluted Weighted-Average Shares Used In EPS Calculations


	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599

Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2011

Discontinued Operations [Abstract]

Components Of The Net Assets Of EPC Discontinued Operations


(dollars in millions)	December 31, 2010
Current Assets
Trade receivables	$	110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0

Total Current Assets		272.3

Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8

Total Assets	$	671.6


Current Liabilities
Trade payables	$	89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5

Total Current Liabilities		122.6

Deferred taxes		77.2
Other liabilities		1.3

Total Liabilities		201.1

Total Net Assets	$	470.5

Schedule Of Condensed Statement Of Earnings Of The EPC Discontinued Operations


Years ended December 31 (dollars in millions)
	2011			2010			2009
Net sales	$	531.8		$	701.8		$	616.5
Cost of products sold		415.6			544.0			510.5

Gross profit		116.2			157.8			106.0
Selling, general and administrative expenses		61.5			84.2			74.8
Restructuring and other		-			0.1			(1.6	)
Interest expense		2.2			3.6			4.7
Other (income) expense—net		(6.0	)		(0.7	)		0.3

		58.5			70.6			27.8
Provision (benefit) for income taxes		15.5			16.2			(1.3	)

Net earnings	$	43.0		$	54.4		$	29.1

Schedule Of The Cash Flow Provided By EPC Discontinued Operations


Years ended December 31 (dollars in millions)
	2011			2010			2009

Operating Activities
Earnings	$	43.0		$	54.4		$	29.1
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5			26.1			29.2
Gain on sale of assets		(4.8	)		(0.2	)		(2.0	)
Net changes in operating assets and liabilities
Current assets and liabilities		(56.2	)		(23.3	)		74.5
Noncurrent assets and liabilities		0.9			4.5			9.9
Other		(1.7	)		-			(0.7	)

Cash (Used in) Provided by Discontinued Operating Activities		(2.3	)		61.5			140.0

Investing Activities
Capital expenditures		(10.5	)		(14.3	)		(14.3	)
Proceeds on sale of assets		6.1			5.5			7.6
Proceeds from sale of operations		752.5			-			-
Payments associated with sale		(147.9	)		-			-

Cash Provided by (Used in) Discontinued Investing Activities		600.2			(8.8	)		(6.7	)

Cash Flow Provided by Discontinued Operations	$	597.9		$	52.7		$	133.3

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Acquisitions [Abstract]

Summary Of Preliminary Estimate Of Fair Value Of The Assets Acquired And Liabilities Assumed Due To Acquisition


August 26, 2011 (dollars in millions)

Current assets, net of cash acquired	$	54.0
Property, plant and equipment		41.9
Intangible assets		258.3
Other assets		0.1
Goodwill		111.4

Total assets acquired		465.7
Current liabilities		24.3
Long-term liabilities		3.5

Total liabilities assumed		27.8

Net assets acquired	$	437.9

Schedule Of Pro Forma Unaudited Results Of Operations Assuming Acquisition At Beginning Of Fiscal Year


	Years ended December 31,
	2011		2010
Net sales	$	1,835.8	$	1,664.0
Earnings from continuing operations		122.5		71.5
Earnings per common share:
Basic	$	2.66	$	1.56

Diluted	$	2.63	$	1.55

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References + Details

Restructuring, Impairment, Other Charges And Settlement income (Tables)

12 Months Ended

Dec. 31, 2011

Restructuring, Impairment, Other Charges And Settlement Income [Abstract]

Schedule Of Analysis Of The Company's Restructuring, Impairment And Settlement Reserve


	Severance Costs			Intangible Impairment			Settlement Income			Other			Total
Balance at December 31, 2009	$	-		$	-		$	-		$	-		$	-
Expense (income) recognized		1.1			3.3			(5.0	)		0.7			0.1
Intangible asset write-down		-			(3.3	)		-			(0.1	)		(3.4	)
Settlement income		-			-			5.0			-			5.0

Balance at December 31, 2010	$	1.1		$	-		$	-		$	0.6		$	1.7
Cash payments		(1.1	)		-			-			(0.6	)		(1.7	)
Income recognized		-			-			(11.2	)		-			(11.2	)
Settlement income		-			-			11.2			-			11.2

Balance at December 31, 2011	$	-		$	-		$	-		$	-		$	-

Statement Of Cash Flows (Tables)

12 Months Ended

Dec. 31, 2011

Statement Of Cash Flows [Abstract]

Schedule Of Supplemental Cash Flow Information


Years ended December 31 (dollars in millions)	2011			2010			2009
Net change in current assets and liabilities, net of acquisitions:
Receivables	$	(28.1	)	$	(33.2	)	$	(10.5	)
Inventories		4.7			(32.0	)		17.0
Other current assets		(4.5	)		(1.5	)		(1.0	)
Trade payables		27.4			23.3			40.8
Accrued liabilities, including payroll and benefits		5.8			(0.7	)		6.4
Income taxes payable		2.7			6.6			(5.9	)

	$	8.0		$	(37.5	)	$	46.8

Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Schedule Of Inventories


December 31 (dollars in millions)	2011		2010
Finished products	$	85.6	$	72.7
Work in process		10.6		14.4
Raw materials		98.9		82.7

Inventories, at FIFO cost		195.1		169.8
LIFO reserve		26.7		23.0

	$	168.4	$	146.8

Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment [Abstract]

Schedule Of Property, Plant And Equipment


December 31 (dollars in millions)	2011		2010
Land	$	11.7	$	9.2
Buildings		166.8		121.8
Equipment		418.7		377.9
Software		16.8		16.0

		614.0		524.9
Less accumulated depreciation and amortization		298.7		266.5

	$	315.3	$	258.4

Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill And Other Intangible Assets [Abstract]

Schedule Of Changes In The Carrying Amount Of Goodwill


(dollars in millions)	North America			Rest of World			Total
Balance at December 31, 2009	$	264.6		$	55.3		$	319.9
Acquisition of businesses (see Note 3)		-			1.1			1.1
Currency translation adjustment		2.8			-			2.8

Balance at December 31, 2010		267.4			56.4			323.8
Acquisition of businesses (see Note 3)		108.8			2.6			111.4
Currency translation adjustment		(1.3	)		(0.1	)		(1.4	)

Balance at December 31, 2011	$	374.9		$	58.9		$	433.8

Schedule Of Carrying Amount Of Other Intangible Assets


	2011							2010
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Amortizable intangible assets
Patents	$	6.8	$	(3.6	)	$	3.2	$	6.6	$	(2.8	)	$	3.8
Customer lists		231.0		(27.4	)		203.6		78.6		(18.6	)		60.0

Total amortizable intangible assets		237.8		(31.0	)		206.8		85.1		(21.4	)		63.7
Indefinite-lived intangible assets
Trade names		145.9		-			145.9		42.9		-			42.9

Total intangible assets	$	383.7	$	(31.0	)	$	352.7	$	128.0	$	(21.4	)	$	106.6

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Debt And Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2011

Debt And Lease Commitments [Abstract]

Schedule Of Debt And Lease Commitments


December 31 (dollars in millions)	2011		2010
Bank credit lines, average year-end interest rate of 6.8% for 2011 and 5.1% for 2010	$	6.2	$	6.5
Revolving credit agreement borrowings, average year-end interest rate of 1.8% for 2011 and 2010		330.0		115.0
Commercial paper, average year-end interest rate of 1.3% for 2011		27.7		-
Term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.9% for 2011 and 2010		68.3		86.9
Canadian revolving credit agreement borrowings, average year-end interest rate of 2.7% for 2010		-		22.6
Canadian term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.3% for 2011 and 2010		29.4		30.0

		461.6		261.0
Less long-term debt due within one year		18.6		18.6

Long-term debt	$	443.0	$	242.4

Schedule Of Maturities Of Long-Term Debt


Years ending December 31 (dollars in millions)	Amount
2012	$	18.6
2013		382.5
2014		14.4
2015		14.4
2016		14.4

Schedule Of Future Minimum Payments Under Non-Cancelable Operating Leases


Years ending December 31 (dollars in millions)	Amount
2012	$	12.4
2013		8.6
2014		7.5
2015		6.5
2016		4.6
Thereafter		10.9

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Stockholders' Equity [Abstract]

Schedule Of Accumulated Other Comprehensive Loss


December 31 (dollars in millions)	2011			2010
Cumulative foreign currency translation adjustments	$	16.5		$	23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)		(0.3	)		10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)		(318.3	)		(263.8	)
Unrealized net gain on investments less related income tax provision of $(0.7)		1.2			-


	$	(300.9	)	$	(229.4	)

Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock Based Compensation [Abstract]

Schedule Of Changes In Option Shares


	Weighted-Avg. Per Share		Years Ended December 31									(dollars in millions) Aggregate Intrinsic Value
	Exercise Price		2011			2010			2009

Outstanding at beginning of year		$22.17		1,623,101			1,630,751			1,933,601
Granted
2011—$43.12 to $44.12 per share				178,200
2010—$27.93 per share							237,000
2009—$16.40 to $21.66 per share										506,400
Exercised
2011—$15.99 to $27.93 per share				(364,081	)								$ 7.7
2010—$9.04 to $25.84 per share							(240,801	)					3.3
2009—$9.04 to $19.47 per share										(809,250	)		8.1
Forfeited
2011—$19.00 to $43.12 per share				(15,353	)
2010—$19.00 to $27.93 per share							(3,849	)

Outstanding at end of year
(2011—$15.99 to $44.12 per share)		24.84		1,421,867			1,623,101			1,630,751

Exercisable at end of year		22.23		989,933			951,035			831,401

Schedule Of Weighted-Average Information By Range Of Exercise Prices For Stock Options Outstanding And Exercisable


Range of Exercise Prices	Options Outstanding at December 31, 2011	Weighted- Average Exercise Price	Options Exercisable at December 31, 2011	Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Life
$15.99 to $19.47	561,349	$ 18.86	426,899	$ 18.85	7 years
$21.34 to $24.02	298,401	23.18	294,851	23.20	7 years
$25.84 to $43.12	562,117	31.67	268,183	26.53	8 years

	1,421,867		989,933

Schedule Of Weighted-Average Fair Value Per Option At The Date Of Grant


	2011		2010		2009
Expected life (years)		6.4		6.4		6.4
Risk-free interest rate		3.6%		3.6%		2.8%
Dividend yield		1.3%		1.9%		2.8%
Expected volatility		38.4%		38.7%		35.0%

Schedule Of Share Unit Activity Under The Plan


	Number of Units			Weighted-Average Grant Date Value
Outstanding at January 1, 2011		473,438		$22.43

Granted		75,625		43.12

Vested		(233,702	)	22.72

Forfeited/cancelled		(28,807	)	25.28


Outstanding at December 31, 2011		286,554		$27.36

Pension And Other Post-Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Funded Status Of Defined Benefit Pension And Post-Retirement Benefit Plans


	Pension Benefits						Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2011			2010
Accumulated Benefit Obligation (ABO) at December 31	$	895.1		$	850.3			N/A			N/A

Change in projected benefit obligations (PBO)
PBO at beginning of year	$	(862.1	)	$	(826.7	)	$	(14.9	)	$	(17.0	)
Service cost		(9.1	)		(8.6	)		(0.1	)		(0.2	)
Interest cost		(44.1	)		(46.7	)		(0.7	)		(0.8	)
Participant contributions		-			-			(0.3	)		(0.4	)
Plan amendments		(1.6	)		-			-			-
Actuarial (loss) gain including assumption changes		(52.0	)		(38.7	)		1.9			2.1
Benefits paid		60.4			58.6			1.4			1.4
Curtailment		2.0			-			-			-

PBO at end of year	$	(906.5	)	$	(862.1	)	$	(12.7	)	$	(14.9	)

Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	640.8		$	594.0		$	-		$	-
Actual return on plan assets		11.3			74.8			-			-
Contribution by the company		176.9			30.6			1.1			1.0
Participant contributions		-			-			0.3			0.4
Benefits paid		(60.4	)		(58.6	)		(1.4	)		(1.4	)

Plan assets at end of year	$	768.6		$	640.8		$	-		$	-

Funded status	$	(137.9	)	$	(221.3	)	$	(12.7	)	$	(14.9	)
Amount recognized in the balance sheet
Current liabilities	$	-		$	-		$	(1.1	)	$	(1.3	)
Non-current liabilities		(137.9	)		(221.3	)		(11.6	)		(13.6	)

Net pension liability at end of year	$	(137.9	)*	$	(221.3	)*	$	(12.7	)	$	(14.9	)

Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	532.0		$	447.2		$	(2.8	)	$	(3.3	)
Prior service cost		(8.9	)		(12.7	)		-			-

Total recognized in accumulated other comprehensive loss	$	523.1		$	434.5		$	(2.8	)	$	(3.3	)

*	In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.

Schedule Of Net Periodic Benefit Cost


	Pension Benefits									Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
Net periodic benefit cost
Service cost	$	9.1		$	8.6		$	8.4		$	0.2		$	0.2		$	0.2
Interest cost		44.2			46.7			49.8			0.7			0.8			1.0
Expected return on plan assets		(70.6	)		(61.6	)		(60.8	)		-			-			-
Amortization of unrecognized:
Net actuarial loss		24.4			17.7			10.6			(0.4	)		(0.4	)		-
Prior service cost		(0.9	)		(0.9	)		0.3			-			-			-
Curtailment and other one-time charges		(1.3	)		-			-			(2.1	)		-			-

Defined-benefit plan cost		4.9			10.5			8.3		$	(1.6	)	$	0.6		$	1.2

Various U.S. defined contribution plans cost		5.6			5.8			6.5

	$	10.5	*	$	16.3	*	$	14.8	*

Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	109.3		$	25.4		$	34.8		$	0.2		$	(2.1	)	$	-
Amortization of net actuarial (loss) gain		(24.4	)		(17.7	)		(10.6	)		0.4			0.4			-
Prior service cost		2.8			-			(12.4	)								-
Amortization of prior service cost		0.9			0.9			(0.3	)		(0.1	)		(0.1	)		-

Total recognized in other comprehensive earnings		88.6			8.6			11.5			0.5			(1.8	)		-

Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	$	93.5		$	19.1		$	19.8		$	(1.1	)	$	(1.2	)	$	1.2

Schedule Of Actuarial Assumptions Used To Determine Benefit Obligations


	Pension Benefits						Post-retirement Benefits
	2011			2010			2011			2010
Discount rate		4.90	%		5.35	%		4.90	%		5.35	%
Average salary increases		4.00	%		4.00	%		4.00	%		4.00	%

Schedule Of Actuarial Assumptions Used To Determine Net Periodic Benefit Cost


	Pension Benefits									Post-retirement Benefits
Years ended December 31	2011			2010			2009			2011			2010			2009
Discount rate		5.35	%		5.80	%		6.60	%		5.35	%		5.80	%		6.60	%
Expected long-term return on plan assets		8.75	%		8.75	%		8.75	%		n/a			n/a			n/a
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%

Schedule Of Health Care Cost Trend Rates


	2011			2010
Health care cost trend rate assumed for next year		10.00	%		10.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%
Year that the rate reaches the ultimate trend rate		2016			2015

Schedule Of Weighted Asset Allocations By Asset Category


Asset Category	2011			2010
Equity securities		55	%		62	%
Debt securities		37			30
Private equity		5			6
Other		3			2

		100	%		100	%

Schedule Of Reconciliation Of The Fair Value Measurements Using Significant Unobservable Inputs


	Short Term Investments		Other Fixed Income Securities		Private Equity			Total
Balance at December 31, 2009	$	28.2	$	0.2	$	29.4		$	57.6

Actual return (loss) on plan assets:
Relating to assets still held at the reporting date		-		-		4.0			4.0
Relating to assets sold during the period		-		-		(0.1	)		(0.1	)
Purchases, sales and settlements		27.0		-		4.4			(11.1	)
Transfers in and/or out of Level 3		-		0.2		-			0.2

Balance at December 31, 2010	$	12.7	$	0.2	$	37.7		$	50.6
Actual (loss) return on plan assets:
Relating to assets still held at the reporting date		-		-		(4.4	)		(4.4	)
Relating to assets sold during the period		-		-		9.8			9.8
Purchases, sales and settlements		27.0		-		(8.4	)		18.6

Balance at December 31, 2011	$	39.7	$	0.2	$	34.7		$	74.6

Schedule Of Estimated Future Payments


Years ending December 31 (dollars in millions)	Pension Benefits	Post-retirement Benefits
2012	$ 59.8	$ 1.0
2013	60.1	1.0
2014	60.1	1.0
2015	60.6	0.9
2016	60.8	0.9
2017 – 2021	306.9	4.2

Fair Value Measurement 2011 [Member]

Schedule Of Fair Value Measurement Of Plan Assets


			December 31, 2011
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)

Short-term investments	$	39.7	$	-	$	-	$	39.7

Equity Securities
Common stocks		267.6		267.6		-		-
Preferred stocks		-		-		-		-
Commingled equity funds		146.1		-		146.1		-

Fixed Income Securities
U.S. Treasury securities		74.8		74.8		-		-
Government agency securities		3.7		-		3.7		-
Corporate asset backed securities		0.2		-		0.2		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		1.2		-		1.2		-
Other fixed income securities		92.4		-		92.2		0.2
Commingled fixed income funds		106.6		-		106.6		-

Other types of investments
Private equity		34.7		-		-		34.7


Total fair value of plan asset investments	$	767.0	$	342.4	$	350.0	$	74.6

Non-investment plan assets		2.0

Total plan assets	$	769.0

Fair Value Measurement 2010 [Member]

Schedule Of Fair Value Measurement Of Plan Assets


			December 31, 2010
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)

Short-term investments	$	12.8	$	-	$	0.1	$	12.7

Equity Securities
Common stocks		279.0		279.0		-		-
Preferred stocks		0.1		0.1		-		-
Commingled equity funds		121.3		-		121.3		-

Fixed Income Securities
U.S. Treasury securities		42.2		42.2		-		-
Government agency securities		6.5		-		6.5		-
Corporate asset backed securities		3.1		-		3.1		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		2.4		-		2.4		-
Other fixed income securities		31.1		-		30.9		0.2
Commingled fixed income funds		104.1		-		104.1		-

Other types of investments
Private equity		37.7		-		-		37.7


Total fair value of plan asset investments	$	640.3	$	321.3	$	268.4	$	50.6

Non-investment plan assets		0.5

Total plan assets	$	640.8

Ashland City, TN Facility Flood (Tables)

12 Months Ended

Dec. 31, 2010

Ashland City, TN Facility Flood [Abstract]

Schedule Of Flood Related Expense


(dollars in millions)
Repair or write off of buildings and equipment	$	36.1
Net inventory loss		16.4
Site cleanup and restoration		14.8

		67.3
Less: insurance proceeds		31.9

Total flood related expense	$	35.4

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Components Of The Provision For Income Taxes From Continuing Operations


Years ended December 31 (dollars in millions)	2011			2010			2009
Current:
Federal	$	(28.0	)	$	(2.9	)	$	16.0
State		(5.2	)		2.4			2.9
International		4.9			14.1			12.9
Deferred:
Federal		63.3			7.0			3.2
State		11.9			0.5			(1.1	)
International		3.4			(3.8	)		(3.0	)

	$	50.3		$	17.3		$	30.9

Difference Between Provision For Income Taxes And U.S. Federal Statutory Rate


Years ended December 31	2011			2010			2009
Provision at U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State income and franchise taxes, net of federal benefit		3.2			1.6			2.9
International income tax rate differential		(4.3	)		(13.4	)		(6.2	)
Research tax credits		(0.6	)		(0.4	)		(0.7	)
State tax credits		(2.3	)		-			-
Other		0.1			0.5			2.7

		31.1	%		23.3	%		33.7	%

Components Of Earnings From Continuing Operations Before Income Taxes


Years ended December 31 (dollars in millions)	2011		2010		2009
United States	$	117.8	$	12.4	$	48.9
International		43.7		62.0		42.9

	$	161.5	$	74.4	$	91.8

Tax Effects Of Temporary Differences Of Assets And Liabilities


	2011					2010
		Assets			Liabilities		Assets			Liabilities
Employee benefits	$	71.5		$	-	$	95.0		$	-
Product liability and warranties		60.6			-		58.9			-
Inventories		-			3.3		-			3.3
Accounts receivable		9.6			-		7.4			-
Property, plant and equipment		-			35.1		-			29.9
Intangibles		-			29.1		-			28.7
Environmental		3.3			-		3.5			-
RBC stock and collar		-			8.5		-			-
Undistributed foreign earnings		-			56.5		-			-
Tax loss and credit carryovers		17.0			-		16.0			-
All other		0.4			-		-			0.1

Valuation allowance		(8.4	)		-		(1.9	)		-


	$	154.0		$	132.5	$	179.0		$	62.0

Net asset				$	21.5				$	117.0

Balance Sheet Classification Of Deferred Tax Assets And Liabilities


December 31 (dollars in millions)	2011			2010
Current deferred income tax assets	$	24.6		$	27.3
Long-term deferred income tax (liabilities) assets		(3.1	)		89.7


Net asset	$	21.5		$	117.0

Reconciliation Of Tax Loss Carryovers, Credit Carryovers And Valuation Allowances


	Net Operating Losses and Tax Credits					Valuation Allowances
	2011			2010		2011			2010
Beginning balance	$	16.0		$	14.1	$	1.9		$	1.5
Additions		10.3			1.9		6.6			0.4
Reductions		(9.3	)		-		(0.1	)		-

Ending balance	$	17.0		$	16.0	$	8.4		$	1.9

Reconciliation Of Unrecognized Tax Benefits


(Dollars in millions)	2011			2010
Balance at January 1	$	2.0		$	3.8
Additions based on tax positions related to the current year		-			0.1
Reductions for tax positions of prior years		(0.2	)		(1.9	)

Balance at December 31	$	1.8		$	2.0

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Operations By Segment (Tables)

12 Months Ended

Dec. 31, 2011

Operations By Segment [Abstract]

Schedule Of Operating Earnings


	Earnings									Net Sales
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
North America	$	154.0		$	91.2		$	115.8		$	1,289.5		$	1,155.4		$	1,135.9
Rest of World		42.7			42.4			33.0			455.6			368.9			256.5
Inter-segment		(0.2	)		(0.7	)		0.1			(34.6	)		(35.0	)		(17.4	)

Total segments – operating earnings	$	196.5		$	132.9		$	148.9		$	1,710.5		$	1,489.3		$	1,375.0


General corporate and research and development expenses		(25.7	)		(51.6	)		(50.3	)
Interest expense		(9.3	)		(6.9	)		(7.2	)


Earnings before income taxes		161.5			74.4			91.4
Provision for income taxes		(50.3	)		(17.3	)		(30.9	)


Earnings from continuing operations	$	111.2		$	57.1		$	60.5

Schedule Of Assets, Depreciation And Capital Expenditures By Segment


	Total Assets (December 31)						Depreciation and Amortization (Years Ended December 31)						Capital Expenditures (Years Ended December 31)
(dollars in millions)	2011		2010		2009		2011		2010		2009		2011		2010		2009
North America	$	1,319.2	$	868.3	$	826.9	$	33.9	$	30.2	$	32.2	$	31.6	$	37.8	$	26.9
Rest of World		342.4		299.7		268.5		12.4		10.0		5.6		20.5		13.8		15.1
Corporate assets		687.4		271.0		235.2		0.7		0.6		0.5		1.4		1.9		0.7
EPC discontinued operations		-		671.6		642.4		-		-		-		-		-		-

Total	$	2,349.0	$	2,110.6	$	1,973.0	$	47.0	$	40.8	$	38.3	$	53.5	$	53.5	$	42.7

Schedule Of Net Sales And Long-Lived Assets By Geographic Location


	Long-lived Assets							Net Sales
(dollars in millions)	2011		2010		2009			2011		2010		2009

United States	$	218.2	$	173.2	$	169.2	United States	$	1,094.3	$	960.4	$	959.0

China		70.7		57.1		53.3	China		382.2		304.4		222.0

Canada		20.9		22.2		22.5	Canada		160.2		160.4		150.4

Other Foreign		32.0		31.2		26.4	Other Foreign		73.8		64.1		43.6


Total	$	341.8	$	283.7	$	271.4	Total	$	1,710.5	$	1,489.3	$	1,375.0

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Quarterly Results Of Operations (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Results Of Operations [Abstract]

Schedule Of Quarterly Results Of Operations


(dollars in millions, except per share amounts)
	1st Quarter				2nd Quarter					3rd Quarter				4th Quarter
		2011		2010		2011		2010			2011		2010		2011		2010
Net sales	$	417.4	$	366.7	$	405.3	$	375.0		$	412.0	$	377.4	$	475.8	$	370.2
Gross profit		127.0		108.3		111.9		114.2			118.7		107.2		155.0		116.3
Earnings
Continuing operations		24.2		21.3		28.6		(0.9	)		26.9		16.2		31.5		20.5
Discontinued operations		16.8		9.5		21.7		17.5			155.4		15.8		0.6		11.6

Net earnings		41.0		30.8		50.3		16.6			182.3		32.0		32.1		32.1
Net loss attributable to noncontrolling interest
Continuing operations		-		0.1		-		-			-		-		-		0.1
Discontinued operations		-		-		-		-			-		-		-		-

Net earnings attributable to A. O. Smith Corporation	$	41.0	$	30.9	$	50.3	$	16.6		$	182.3	$	32.0	$	32.1	$	32.2


Basic earnings (loss) per share
Continuing operations		0.52		0.47		0.62		(0.02	)		0.58		0.35		0.68		0.45
Discontinued operations		0.37		0.21		0.47		0.38			3.36		0.35		0.01		0.25

Net		0.89		0.68		1.09		0.36			3.94		0.70		0.69		0.70

Diluted earnings (loss) per share
Continuing operations		0.52		0.46		0.62		(0.02	)		0.58		0.35		0.68		0.44
Discontinued operations		0.36		0.21		0.46		0.38			3.33		0.34		0.01		0.25

Net		0.88		0.67		1.08		0.36			3.91		0.69		0.69		0.69


Common dividends declared		0.14		0.13		0.14		0.13			0.16		0.14		0.16		0.14

Organization And Significant Accounting Policies (Narrative) (Details) shares in Thousands, $ in Millions		1 Months Ended		12 Months Ended
	Aug. 22, 2011 USD ($) $ / shares shares	Aug. 22, 2011 $ / shares shares	Aug. 22, 2011 $ / shares shares	Dec. 31, 2011 USD ($) $ / shares	Dec. 31, 2011 USD ($) years $ / shares	Dec. 31, 2011 USD ($) segments $ / shares	Dec. 31, 2011 USD ($) $ / shares	Dec. 31, 2011 USD ($) $ / shares	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Nov. 30, 2010 USD ($)
Organization And Significant Accounting Policies [Line Items]
Number of reporting segments						2	2
Proceeds from sale of segment, shares \| shares		2,830
Fair value of term notes				$ 106.7	$ 106.7	$ 106.7	$ 106.7	$ 106.7
Carrying amount of term notes				$ 97.7	$ 97.7	$ 97.7	$ 97.7	$ 97.7
Percentage of (LIFO) inventory				65.00%	65.00%	65.00%	65.00%	65.00%	60.00%
Percentage of equity collar contract purchased to protect a portion of appreciation	50.00%
After-tax loss of the effective portion of the contracts								$ 0.5	$ 21.6
Interest rate swap outstanding											$ 25.0
Derivative interest rate liabilities recorded in accrued liabilities										$ 1.0
Allowance for doubtful accounts				$ 3.4	$ 3.4	$ 3.4	$ 3.4	3.4	3.5
Advertising costs charged to operations								58.9	47.9	41.0
Amortization of total advertising costs								13.1	9.2	5.7
Research and development costs								42.7	37.1	31.0
Product warranty period, lower range (in years)							1
Product warranty period, upper range (in years)							10
Excess tax deductions recognized as financing cash flows								4.3	0.7	$ 2.9
Percentage of stock dividend to stock holders							50.00%
Commodity Futures Contracts [Member]
Organization And Significant Accounting Policies [Line Items]
Amount in excess of cash deposits on unrealized losses on commodity derivatives								10.0
After-tax loss of the effective portion of the contracts								0.1
Reclassification period for effective portion of contract, in years							1
Commodity hedges outstanding, total weight of metals, in pounds							300,000
Foreign Currency Forward Contracts [Member]
Organization And Significant Accounting Policies [Line Items]
Change in foreign currency valuation from discontinued operations								$ 3.2	$ 0.4
Put Option [Member]
Organization And Significant Accounting Policies [Line Items]
Price of the equity collar, per share \| $ / shares	63.29	63.29	63.29
Call Option [Member]
Organization And Significant Accounting Policies [Line Items]
Price of the equity collar, per share \| $ / shares	77.32	77.32	77.32
Equity Collar Contract [Member]
Organization And Significant Accounting Policies [Line Items]
Cash dividends or stock deposits on unrealized loss on equity collar, minimum	$ 25.0
Equity collar contract expiration period				March 2012
Buildings [Member]
Organization And Significant Accounting Policies [Line Items]
Estimated service lives used to compute depreciation, minimum \| years					25
Estimated service lives used to compute depreciation, maximum \| years					50
Equipment [Member]
Organization And Significant Accounting Policies [Line Items]
Estimated service lives used to compute depreciation, minimum \| years					3
Estimated service lives used to compute depreciation, maximum \| years					20
Software [Member]
Organization And Significant Accounting Policies [Line Items]
Estimated service lives used to compute depreciation, minimum \| years					3
Estimated service lives used to compute depreciation, maximum \| years					7
Customer Relationships [Member]
Organization And Significant Accounting Policies [Line Items]
Intangible assets estimated useful lives, minimum \| years					10
Intangible assets estimated useful lives, maximum \| years					25
Minimum [Member]
Organization And Significant Accounting Policies [Line Items]
Amortization of total advertising costs, months							12
Maximum [Member]
Organization And Significant Accounting Policies [Line Items]
Amortization of total advertising costs, months							24
EPC [Member]
Organization And Significant Accounting Policies [Line Items]
Proceeds from sale of segment, shares \| shares	2,830		2,830
Proceeds from sale of Electrical Products segment, cash received	$ 760.0
Regal Beloit Corporation [Member]
Organization And Significant Accounting Policies [Line Items]
RBC share price per share \| $ / shares				$ 50.97	$ 50.97	$ 50.97	$ 50.97	$ 50.97

Organization And Significant Accounting Policies (Summary Of Foreign Currency Forward Contracts By Currency) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 32.6	$ 11.2
Sell	37.8	37.6
Euro [Member]
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	16.1
Sell	1.2	2.2
Canadian Dollar [Member]
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Sell	36.6	35.4
Mexican Peso [Member]
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 16.5	$ 11.2

Organization And Significant Accounting Policies (Schedule Of Impact Of Derivative Contracts On The Company's Financial Statements) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ (0.4)	$ 1.4
Not Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	17.9
Foreign Currency Contracts [Member] \| Designated As Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	1.3	1.1
Foreign Currency Contracts [Member] \| Designated As Hedging Instrument [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(1.6)	(0.5)
Commodities Contracts [Member] \| Designated As Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets		$ 0.8
Commodities Contracts [Member] \| Designated As Hedging Instrument [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(0.1)
Equity Collar Contract [Member] \| Not Designated As Hedging Instrument [Member] \| Investments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ 17.9

Organization And Significant Accounting Policies (Schedule Of Effect Of Derivative Instruments On The Statement Of Earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)	$ 0.5	$ 21.6
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	21.0	22.0
Amount of gain recognized in earnings on a derivative (ineffective portion)	0.1
Commodities Contracts [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)	(3.0)	10.2
Commodities Contracts [Member] \| Cost Of Products Sold [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	(0.1)	1.1
Commodities Contracts [Member] \| Discontinued Operations [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	7.0	12.4
Amount of gain recognized in earnings on a derivative (ineffective portion)	0.1
Commodities Contracts [Member] \| Gain On Sale Of EPC [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	1.8
Foreign Currency Contracts [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)	3.5	11.5
Foreign Currency Contracts [Member] \| Cost Of Products Sold [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	0.2	0.6
Foreign Currency Contracts [Member] \| Discontinued Operations [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	6.9	9.0
Foreign Currency Contracts [Member] \| Gain On Sale Of EPC [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	5.2
Interest Rate Swap Contract [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)		(0.1)
Interest Rate Swap Contract [Member] \| Interest Expense [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)		$ (1.1)
Not Designated As Hedging Instrument [Member] \| Equity Collar Contract [Member] \| Other Income - Net [Member]
Derivative [Line Items]
Amount of gain recognized in earnings from continuing operations on derivative	$ 17.9

Organization And Significant Accounting Policies (Schedule Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Fair Value Measurements [Line Items]
Assets measured at fair value on recurring basis	$ 162.0	$ 1.4
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value on recurring basis	144.2	0.6
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value on recurring basis	$ 17.8	$ 0.8

Organization And Significant Accounting Policies (Schedule Of Product Warranty Liability Activity) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	May 05, 2011	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Balance at beginning of year			$ 112.2	$ 108.6
Lochinvar acquisition (see Note 3)			5.8
Expense			64.6	62.7
Net increase in warranty reserve due to settlement			7.5
Claims settled			(58.3)	(59.1)
Balance at end of year			$ 131.8	$ 112.2
Warranty Reserves [Member]
Net increase in warranty reserve due to settlement	$ 7.5	$ 8.2

Organization And Significant Accounting Policies (Schedule Of Computation Of Basic And Diluted Weighted-Average Shares Used In EPS Calculations) (Details) - shares	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Organization And Significant Accounting Policies [Abstract]
Denominator for basic earnings per share - weighted-average shares outstanding	46,119,032	45,743,246	34,289,257
Effect of dilutive stock options, restricted stock and share units	455,586	419,469	187,599
Denominator for diluted earnings per share	46,574,618	46,162,715	34,476,856

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Discontinued Operations (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions		1 Months Ended		3 Months Ended	12 Months Ended
	Aug. 22, 2011	Aug. 22, 2011	Aug. 22, 2011	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Proceeds from sale of business segment					$ 752.5
Proceeds from sale of business segment, shares		2,830
Value of shares from sale of business segment					144.4
Additional income tax accrual					56.5
Gain on sale of assets					(4.8)	(0.2)	$ (2.0)
Income taxes payable						2.5
Current liabilities-net, EPC discontinued operations					31.5	122.6
Long-term liabilities-net, EPC discontinued operations					8.7	$ 78.5
China Facility [Member]
Gain on sale of assets				$ 4.8
EPC [Member]
Proceeds from sale of business segment			$ 759.9
Proceeds from sale of business segment, shares	2,830		2,830
Working capital adjustment			$ 7.4
Value of shares from sale of business segment			$ 140.6
Income taxes paid					126.5
Commissions paid					21.4
Additional income tax accrual					56.5
Income taxes payable					34.2
Gain related to cumulative transaction adjustments					$ 10.9

Discontinued Operations (Components Of The Net Assets Of EPC Discontinued Operations) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations [Abstract]
Trade receivables		$ 110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0
Total Current Assets		272.3
Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8
Total Assets		671.6
Trade payables		89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5
Total Current Liabilities	$ 31.5	122.6
Deferred taxes		77.2
Other liabilities		1.3
Total Liabilities		201.1
Total Net Assets		$ 470.5

Discontinued Operations (Schedule Of Condensed Statement Of Earnings Of The EPC Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discontinued Operations [Abstract]
Net sales									$ 531.8	$ 701.8	$ 616.5
Cost of products sold									415.6	544.0	510.5
Gross profit									116.2	157.8	106.0
Selling, general and administrative expenses									61.5	84.2	74.8
Restructuring and other										0.1	(1.6)
Interest expense									2.2	3.6	4.7
Other (income) expense - net									(6.0)	(0.7)	0.3
Earnings before income taxes									58.5	70.6	27.8
Provision (benefit) for income taxes									15.5	16.2	(1.3)
Net earnings	$ 0.6	$ 155.4	$ 21.7	$ 16.8	$ 11.6	$ 15.8	$ 17.5	$ 9.5	$ 43.0	$ 54.4	$ 29.1

Discontinued Operations (Schedule Of The Cash Flow Provided By EPC Discontinued Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discontinued Operations [Abstract]
Earnings		$ 54.4	$ 29.1
Depreciation and amortization	$ 16.5	26.1	29.2
Gain on sale of assets	(4.8)	(0.2)	(2.0)
Current assets and liabilities	(56.2)	(23.3)	74.5
Noncurrent assets and liabilities	0.9	4.5	9.9
Other	(1.7)		(0.7)
Cash (Used in) Provided by Discontinued Operating Activities	(2.3)	61.5	140.0
Capital expenditures	(10.5)	(14.3)	(14.3)
Proceeds on sale of assets	6.1	5.5	7.6
Proceeds from sale of operations	752.5
Payments associated with sale	(147.9)
Cash Provided by (Used in) Discontinued Investing Activities	600.2	(8.8)	(6.7)
Cash Flow Provided by Discontinued Operations	$ 597.9	$ 52.7	$ 133.3

Acquisitions (Narrative) (Details) $ in Millions	1 Months Ended		3 Months Ended								4 Months Ended	12 Months Ended
Acquisitions (Narrative) (Details) $ in Millions	Aug. 26, 2011 USD ($)	Nov. 30, 2009 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2010 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Jul. 31, 2010 USD ($)	Apr. 30, 2009 USD ($)
Business Acquisition [Line Items]
Aggregate cash purchase price, net of cash acquired												$ 421.1	$ 11.8	$ 71.4
Acquired intangible assets	$ 258.3
Business acquisition purchase price allocation goodwill and intangible assets deductible for income tax purposes			$ 369.7								$ 369.7	369.7
Revenues from acquisitions included in operations			475.8	$ 412.0	$ 405.3	$ 417.4	$ 370.2	$ 377.4	$ 375.0	$ 366.7		1,710.5	1,489.3	1,375.0
Pretax earnings from acquisitions included in operations												161.5	74.4	91.8
Interest expense included in operations												9.3	$ 6.9	$ 7.2
Goodwill acquired	$ 111.4
Lochinvar Corporation [Member]
Business Acquisition [Line Items]
Percentage of shares acquired	100.00%
Cash acquired from acquisition	$ 1.5
Aggregate cash purchase price, net of cash acquired	421.1
Acquisition costs incurred	5.5		5.5								5.5	5.5
Contingent payment	35.0
Volume of sales required to make additional contingent payment	216.0
Estimated fair value of the contingent payment			16.8								16.8	16.8
Acquired intangible assets	$ 258.3
Revenues from acquisitions included in operations											75.9
Pretax earnings from acquisitions included in operations											5.6
Operating earnings from acquisitions included in operations											13.0
Interest expense included in operations											1.9
SWT [Member]
Business Acquisition [Line Items]
Percentage of shares acquired		80.00%					20.00%						20.00%
Business acquisition future fixed cash payment		$ 5.7
Cost of acquisition		$ 76.7					$ 6.0						$ 6.0
Percentage of fair value of assets and liabilities recorded from acquisition		100.00%
Percentage of equity interest acquired		20.00%					100.00%						100.00%
Excess of acquisition value over fair value of assets acquired		$ 90.6
Deferred tax liabilities associated with intangible assets acquired		7.0
Goodwill acquired		55.4
Intangible assets acquired		$ 42.2
Goodwill adjustment related to inventory valuation													$ 1.1
Takagi Industrial Co, Ltd [Member]
Business Acquisition [Line Items]
Cost of acquisition															$ 5.5
China Joint Venture [Member]
Business Acquisition [Line Items]
Percentage of shares acquired							50.00%						50.00%
Cost of acquisition							$ 0.3						$ 0.3
Applied Energy Recovery Systems Inc. [Member]
Business Acquisition [Line Items]
Contingent payment			0.0				0.0				0.0	0.0	0.0
Goodwill acquired			0.5								0.5	0.5
Cash paid for acquisition																$ 0.7
Business acquisition future fixed cash payment made in period reported							$ 0.1						$ 0.1
2010 Through 2013 [Member] \| Applied Energy Recovery Systems Inc. [Member]
Business Acquisition [Line Items]
Contingent payment			0.2								0.2	$ 0.2
Customer Lists [Member]
Business Acquisition [Line Items]
Acquired intangible assets, amortization period, in years												19
Customer Lists [Member] \| Lochinvar Corporation [Member]
Business Acquisition [Line Items]
Acquired intangible assets subject to amortization			152.5								152.5	$ 152.5
Non-Compete Agreements And Patents [Member]
Business Acquisition [Line Items]
Acquired intangible assets, amortization period, in years												10
Non-Compete Agreements And Patents [Member] \| Lochinvar Corporation [Member]
Business Acquisition [Line Items]
Acquired intangible assets subject to amortization			2.3								2.3	$ 2.3
Trade Names [Member] \| Lochinvar Corporation [Member]
Business Acquisition [Line Items]
Acquired intangible assets that are not subject to amortization			$ 103.5								$ 103.5	$ 103.5

Acquisitions (Summary Of Preliminary Estimate Of Fair Value Of The Assets Acquired And Liabilities Assumed Due To Acquisition) (Details) $ in Millions	Aug. 26, 2011 USD ($)
Acquisitions [Abstract]
Current assets, net of cash acquired	$ 54.0
Property, plant and equipment	41.9
Intangible assets	258.3
Other assets	0.1
Goodwill	111.4
Total assets acquired	465.7
Current liabilities	24.3
Long-term liabilities	3.5
Total liabilities assumed	27.8
Net assets acquired	$ 437.9

Acquisitions (Schedule Of Pro Forma Unaudited Results Of Operations Assuming Acquisition At Beginning Of Fiscal Year) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Acquisitions [Abstract]
Net sales	$ 1,835.8	$ 1,664.0
Earnings from continuing operations	$ 122.5	$ 71.5
Basic	$ 2.66	$ 1.56
Diluted	$ 2.63	$ 1.55

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

Restructuring, Impairment, Other Charges And Settlement Income (Narrative) (Details) - USD ($) $ in Millions				3 Months Ended	12 Months Ended
	May 05, 2011	Mar. 26, 2009	Oct. 11, 2005	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Recovery of costs and damages from vendors	$ 35.5
Provision for product warranty					$ 7.5
Gain recognized on legal settlement				$ 11.2
Impairment charges recognized						$ 3.3
Loss recognized upon sale of facility						14.0
Gain on settlement of disputes						5.0
Tower Automotive, Inc. [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Purchase price of facility			$ 4.5
Proceeds from sale of facility		$ 2.0
Loss recognized upon sale of facility		$ 0.9
Other Charges [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Recognized expense associated with retained liabilities of previously owned businesses							$ 0.4
SWT [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Impairment charges recognized						3.3
Restructuring charges						1.8
Gain on settlement of disputes						$ 5.0

Restructuring, Impairment, Other Charges And Settlement Income (Schedule Of Analysis Of The Company's Restructuring, Impairment And Settlement Reserve) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning	$ 1.7
Cash payments	(1.7)
Expense (Income) recognized	(11.2)	0.1
Intangible asset write-down		(3.4)
Settlement income	11.2
Settlement income		5.0
Balance, ending		1.7
Severance Costs [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning	1.1
Cash payments	(1.1)
Expense (Income) recognized		1.1
Balance, ending		1.1
Intangible Impairment [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning
Expense (Income) recognized		3.3
Intangible asset write-down		(3.3)
Settlement Income [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning
Expense (Income) recognized	(11.2)	(5.0)
Settlement income	11.2
Settlement income		5.0
Other [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning	0.6
Cash payments	$ (0.6)
Expense (Income) recognized		0.7
Intangible asset write-down		(0.1)
Balance, ending		$ 0.6

Statement Of Cash Flows (Schedule Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement Of Cash Flows [Abstract]
Receivables	$ (28.1)	$ (33.2)	$ (10.5)
Inventories	4.7	(32.0)	17.0
Other current assets	(4.5)	(1.5)	(1.0)
Trade payables	27.4	23.3	40.8
Accrued liabilities, including payroll and benefits	5.8	(0.7)	6.4
Income taxes payable	2.7	6.6	(5.9)
Net change in current assets and liabilities, net	$ 8.0	$ (37.5)	$ 46.8

Inventories (Details) - USD ($) $ in Millions	12 Months Ended
Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Inventories [Abstract]
Finished products	$ 85.6	$ 72.7
Work in process	10.6	14.4
Raw materials	98.9	82.7
Inventories, at FIFO cost	195.1	169.8
LIFO reserve	26.7	23.0
Inventories, Net	168.4	146.8
After-tax LIFO expense (income)	$ 0.4	$ 0.3	$ (0.6)

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Property, Plant And Equipment [Abstract]
Land	$ 11.7	$ 9.2
Buildings	166.8	121.8
Equipment	418.7	377.9
Software	16.8	16.0
Gross, property, plant and equipment	614.0	524.9
Less accumulated depreciation and amortization	298.7	266.5
Net property, plant and equipment	$ 315.3	$ 258.4

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References + Details

Goodwill And Other Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Goodwill And Other Intangible Assets
Amortization of other intangible assets	$ 9.6	$ 7.1	$ 3.9
Future amortization expenses	$ 14.7
Amortization of intangible assets, weighted average period, years	17
Annual impairment of goodwill	$ 0.0	0.0	$ 0.0
Intangible asset impairment charge		$ 3.3

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 47
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13854-109267

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill And Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Beginning balance	$ 323.8	$ 319.9
Acquisition of businesses	111.4	1.1
Currency translation adjustment	(1.4)	2.8
Ending balance	433.8	323.8
North America [Member]
Goodwill [Line Items]
Beginning balance	267.4	264.6
Acquisition of businesses	108.8
Currency translation adjustment	(1.3)	2.8
Ending balance	374.9	267.4
Rest Of World [Member]
Goodwill [Line Items]
Beginning balance	56.4	55.3
Acquisition of businesses	2.6	1.1
Currency translation adjustment	(0.1)
Ending balance	$ 58.9	$ 56.4

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill And Other Intangible Assets (Schedule Of Carrying Amount Of Other Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable intangible assets	$ 237.8	$ 85.1
Accumulated Amortization, Amortizable intangible assets	(31.0)	(21.4)
Net, Amortizable intangible assets	206.8	63.7
Gross Carrying Amount, Total intangible assets	383.7	128.0
Accumulated amortization, Total intangible assets	(31.0)	(21.4)
Net, Total intangible assets	352.7	106.6
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable intangible assets	6.8	6.6
Accumulated Amortization, Amortizable intangible assets	(3.6)	(2.8)
Net, Amortizable intangible assets	3.2	3.8
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable intangible assets	231.0	78.6
Accumulated Amortization, Amortizable intangible assets	(27.4)	(18.6)
Net, Amortizable intangible assets	203.6	60.0
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, indefinite-lived intangible assets	145.9	42.9
Net, Indefinite-lived intangible assets	$ 145.9	$ 42.9

Debt And Lease Commitments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Debt And Lease Commitments [Abstract]
Revolving credit agreement	$ 425.0
Number of banks involved in multi-year multi-currency revolving credit agreement	8
Revolving credit agreement, maximum borrowing capacity subject to certain conditions	$ 525.0
Revolving credit agreement expiration date	November 13, 2013
Future minimum payments under non-cancelable operating leases due, total	$ 50.5
Rent expense, including payments under operating leases	16.1	$ 13.9	$ 12.3
Interest paid including discontinued operations	$ 11.5	$ 10.5	$ 11.9

Debt And Lease Commitments (Schedule Of Debt And Lease Commitments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Debt	$ 461.6	$ 261.0
Less long-term debt due within one year	18.6	18.6
Long-term debt	443.0	242.4
Bank Credit Lines [Member]
Debt Instrument [Line Items]
Debt	$ 6.2	$ 6.5
Line of credit facility, average year-end interest rate	6.80%	5.10%
Revolving Credit Agreement Borrowings [Member]
Debt Instrument [Line Items]
Debt	$ 330.0	$ 115.0
Line of credit facility, average year-end interest rate	1.80%	1.80%
Canadian Term Notes With Insurance Companies [Member]
Debt Instrument [Line Items]
Debt	$ 29.4	$ 30.0
Average interest rate at year-end	5.30%	5.30%
Debt instrument, maturity date	2018
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt	$ 27.7
Average interest rate at year-end	1.30%
Term Notes With Insurance Companies [Member]
Debt Instrument [Line Items]
Debt	$ 68.3	$ 86.9
Average interest rate at year-end	5.90%	5.90%
Canadian Revolving Credit Agreement Borrowings [Member]
Debt Instrument [Line Items]
Debt		$ 22.6
Line of credit facility, average year-end interest rate		2.70%

Debt And Lease Commitments (Schedule Of Maturities Of Long-Term Debt) (Details) $ in Millions	Dec. 31, 2011 USD ($)
Debt And Lease Commitments [Abstract]
2012	$ 18.6
2013	382.5
2014	14.4
2015	14.4
2016	$ 14.4

Debt And Lease Commitments (Schedule Of Future Minimum Payments Under Non-Cancelable Operating Leases) (Details) $ in Millions	Dec. 31, 2011 USD ($)
Debt And Lease Commitments [Abstract]
2012	$ 12.4
2013	8.6
2014	7.5
2015	6.5
2016	4.6
Thereafter	$ 10.9

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 14, 2007
Stockholders Equity [Line Items]
Preferred Stock, shares authorized	3,000,000
Preferred Stock, par value per share	$ 1
Dividends paid	$ 0.60	$ 0.54	$ 0.51
Number of shares authorized to be repurchased				1,500,000
Shares repurchased	611,589	0	0
Shares repurchased, value	$ 23.5
Smith Investment Company [Member]
Stockholders Equity [Line Items]
Common Stock, shares authorized	10,000,000
Common Stock, par value	$ 0.10
Common Stock [Member]
Stockholders Equity [Line Items]
Common Stock, shares authorized	60,000,000
Common Stock, par value	$ 1
Treasury stock, number of shares held	1,817,815	1,811,199
Class A Common Stock [Member]
Stockholders Equity [Line Items]
Common Stock, shares authorized	14,000,000
Common Stock, par value	$ 5
Shares converted into Common Stock	230,957	364,520	4,365,845
Treasury stock, number of shares held	32,595	32,595

Stockholders' Equity (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity [Abstract]
Cumulative foreign currency translation adjustments	$ 16.5	$ 23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)	(0.3)	10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)	(318.3)	(263.8)
Unrealized net gain on investments less related income tax provision of $(0.7)	1.2
Accumulated other comprehensive loss	(300.9)	(229.4)
Unrealized net (loss) gain on cash flow derivative instruments, income tax benefit (provision)	0.1	(6.9)
Pension liability, income tax	204.1	$ 169.3
Unrealized net gain on investments, related income tax provision	$ (0.7)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

Stock Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Apr. 14, 2009 shares	Dec. 31, 2011 USD ($) $ / shares shares	Dec. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2009 USD ($) $ / shares shares
Stock Based Compensation [Line Items]
Total stock based compensation cost recognized		$ 5.7	$ 5.4	$ 5.1
Stock option compensation recognized		2.8	$ 2.2	$ 2.2
Aggregate intrinsic value for the outstanding options		20.0
Aggregate intrinsic value for the exercisable options		$ 18.2
Average remaining contractual life for outstanding options, in years		8
Average remaining contractual life for exercisable options, in years		7
Weighted-average fair value per option at the date of grant \| $ / shares		$ 16.51	$ 10.19	$ 5.47
Total compensation expense for share units not yet recognized		$ 3.2
Weighted average period over which the expense is expected to be recognized, in months		10
A.O. Smith Combined Compensation Plan [Member]
Stock Based Compensation [Line Items]
Share based compensation additional stock options approved for issuance \| shares	1,875,000
Number of shares available for granting of options, restricted stock or share units \| shares		1,918,931
Restricted Stock And Share Units [Member]
Stock Based Compensation [Line Items]
Award vesting period, in years		three	three	three
Share units granted under the plan \| shares		75,625	101,873	159,801
Value of share units at the date of issuance		$ 3.3	$ 2.9	$ 3.0
Compensation expense		$ 2.9	$ 3.2	$ 2.9
Stock Options [Member]
Stock Based Compensation [Line Items]
Award vesting period, in years		three	three	three
Options granted in 2011, 2010 and 2009, expiration period after date of grant, in years		ten years

Stock Based Compensation (Schedule Of Changes In Option Shares) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Stock Based Compensation [Line Items]
Weighted-Avg. Per Share Exercise Price, beginning period	$ 22.17
Weighted-Avg. Per Share Exercise Price - Granted		$ 27.93
Weighted-Avg. Per Share Exercise Price, ending period		$ 22.17
Weighted-Avg. Per Share Exercise Price, Exercisable	$ 22.23
Outstanding, beginning balance	1,623,101	1,630,751	1,933,601
Outstanding, ending balance		1,623,101	1,630,751	1,933,601
Exercisable at ending period	989,933	951,035	831,401
2011-$43.12 to $44.12 per share [Member]
Stock Based Compensation [Line Items]
Granted	178,200
2010-$27.93 Per Share [Member]
Stock Based Compensation [Line Items]
Granted		237,000
2009-$16.40 To $21.66 Per Share [Member]
Stock Based Compensation [Line Items]
Granted			506,400
2011-$15.99 To $27.93 Per Share [Member]
Stock Based Compensation [Line Items]
Exercised	(364,081)
Aggregate Intrinsic Value, Exercised		$ 7.7
2011-$15.99 to $44.12 Per Share [Member]
Stock Based Compensation [Line Items]
Weighted-Avg. Per Share Exercise Price, ending period	$ 24.84
Outstanding, beginning balance	1,623,101	1,630,751
Outstanding, ending balance	1,421,867	1,623,101	1,630,751
2010-$9.04 To $25.84 Per Share [Member]
Stock Based Compensation [Line Items]
Exercised		(240,801)
Aggregate Intrinsic Value, Exercised			$ 3.3
2009-$9.04 To $19.47 Per Share [Member]
Stock Based Compensation [Line Items]
Exercised			(809,250)
Aggregate Intrinsic Value, Exercised				$ 8.1
2011-$19.00 to $43.12 per share [Member]
Stock Based Compensation [Line Items]
Forfeited	(15,353)
2010-$19.00 To $27.93 Per Share [Member]
Stock Based Compensation [Line Items]
Forfeited		(3,849)
Maximum [Member]
Stock Based Compensation [Line Items]
Weighted-Avg. Per Share Exercise Price - Granted	$ 44.12		$ 21.66
Weighted-Avg. Per Share Exercise Price - Exercised	$ 27.93	$ 25.84	19.47
Weighted-Avg. Per Share Exercise Price - Forfeited	43.12	27.93
Weighted-Avg. Per Share Exercise Price, ending period	$ 44.12
Minimum [Member]
Stock Based Compensation [Line Items]
Weighted-Avg. Per Share Exercise Price - Granted	43.12		16.40
Weighted-Avg. Per Share Exercise Price - Exercised	$ 15.99	$ 9.04	$ 9.04
Weighted-Avg. Per Share Exercise Price - Forfeited	19.00	19.00
Weighted-Avg. Per Share Exercise Price, ending period	$ 15.99

Stock Based Compensation (Schedule Of Weighted-Average Information By Range Of Exercise Prices For Stock Options Outstanding And Exercisable) (Details)	12 Months Ended
	Dec. 31, 2011 $ / shares shares
Stock Based Compensation [Line Items]
Options Outstanding at December 31, 2011 \| shares	1,421,867
Options Exercisable at December 31, 2011 \| shares	989,933
$15.99 To $19.47 [Member]
Stock Based Compensation [Line Items]
Range of Exercise Prices, minimum	$ 15.99
Range of Exercise Prices, maximum	$ 19.47
Options Outstanding at December 31, 2011 \| shares	561,349
Options Outstanding, Weighted-Average Exercise Price	$ 18.86
Options Exercisable at December 31, 2011 \| shares	426,899
Options Exercisable, Weighted-Average Exercise Price	$ 18.85
Weighted-Average Remaining Contractual Life, In Years	7
$21.34 To $24.02 [Member]
Stock Based Compensation [Line Items]
Range of Exercise Prices, minimum	$ 21.34
Range of Exercise Prices, maximum	$ 24.02
Options Outstanding at December 31, 2011 \| shares	298,401
Options Outstanding, Weighted-Average Exercise Price	$ 23.18
Options Exercisable at December 31, 2011 \| shares	294,851
Options Exercisable, Weighted-Average Exercise Price	$ 23.20
Weighted-Average Remaining Contractual Life, In Years	7
$25.84 To $43.12 [Member]
Stock Based Compensation [Line Items]
Range of Exercise Prices, minimum	$ 25.84
Range of Exercise Prices, maximum	$ 43.12
Options Outstanding at December 31, 2011 \| shares	562,117
Options Outstanding, Weighted-Average Exercise Price	$ 31.67
Options Exercisable at December 31, 2011 \| shares	268,183
Options Exercisable, Weighted-Average Exercise Price	$ 26.53
Weighted-Average Remaining Contractual Life, In Years	8

Stock Based Compensation (Schedule Of Weighted-Average Fair Value Per Option At The Date Of Grant) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Based Compensation [Abstract]
Expected life (years)	6.4	6.4	6.4
Risk-free interest rate	3.60%	3.60%	2.80%
Dividend yield	1.30%	1.90%	2.80%
Expected volatility	38.40%	38.70%	35.00%

Stock Based Compensation (Schedule Of Share Unit Activity Under The Plan) (Details) - Restricted Stock And Share Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Based Compensation [Line Items]
Number of Units Outstanding, Beginning of Period	473,438
Number of Units - Granted	75,625	101,873	159,801
Number of Units - Vested	(233,702)
Number of Units - Forfeited/cancelled	(28,807)
Number of Units Outstanding, End of Period	286,554	473,438
Weighted-Average Grant Date Value, Beginning of Period	$ 22.43
Weighted-Average Grant Date Value - Granted	43.12
Weighted-Average Grant Date Value - Vested	22.72
Weighted-Average Grant Date Value - Forfeited/cancelled	25.28
Weighted-Average Grant Date Value, End of Period	$ 27.36	$ 22.43

Pension And Other Post-Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension And Other Post-Retirement Benefits [Line Items]
Percentage match of the first one percent of contributions made by participating employees		100.00%
Percentage match of the next five percent of contributions made by participating employees		50.00%
Defined benefit plan curtailments		$ 12.3
Gain on curtailments		0.0
Medical and life insurance maximum participant coverage age, in years	65
Other comprehensive loss as a result of after tax adjustments for additional minimum pension liability	$ 54.5	5.6	$ 6.7
Defined benefit plan (expense) income associated with discontinued operations	(1.6)	0.0	0.5
Defined benefit plan expense associated with discontinued operations	$ 0.9	1.2	$ 1.7
Target allocation to equity managers, approximately	50.00%
Target allocation to equity managers maximum	60.00%
Common stock included in plan assets	9,388
Total market value of common stock included in plan assets	$ 2.3
Contributions made by company	175.0
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Estimated net actuarial loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	31.8
Estimated net prior service cost that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	(0.9)
Foreign Pension Plans [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Pension plans accumulated comprehensive loss	2.1	1.9
Liability on foreign pension plan	1.6	$ 1.6
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Estimated net actuarial loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	0.3
Estimated net prior service cost that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	$ 0.3
10 Year Pension Plan [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Number of historical years for which compounded annualized returns is considered	10
Compounded annualized return of pension plan	5.50%
25 Year Pension Plan [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Number of historical years for which compounded annualized returns is considered	25
Compounded annualized return of pension plan	9.20%
Class A Common Stock [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Common stock included in plan assets	48,590
Minimum [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Percentage contributions by employer of qualifying contributions			35.00%
Maximum [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Percentage contributions by employer of qualifying contributions			140.00%

Pension And Other Post-Retirement Benefits (Schedule Of Funded Status Of Defined Benefit Pension And Post-Retirement Benefit Plans) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Pension And Other Post-Retirement Benefits [Line Items]

Plan assets at beginning of year

$ 640.3

Contribution by the company

175.0

Curtailment

$ 12.3

Plan assets at end of year

767.0

640.3

Pension Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Accumulated Benefit Obligation (ABO) at December 31

895.1

850.3

PBO at beginning of year

(862.1)

(826.7)

Service cost

(9.1)

(8.6)

Interest cost

(44.1)

(46.7)

Plan amendments

(1.6)

Actuarial (loss) gain including assumption changes

(52.0)

(38.7)

Benefits paid

60.4

58.6

PBO at end of year

(906.5)

(862.1)

Plan assets at beginning of year

640.8

594.0

Actual return on plan assets

11.3

74.8

Contribution by the company

176.9

30.6

Curtailment

2.0

Plan assets at end of year

768.6

640.8

Funded status

(137.9)

(221.3)

Non-current liabilities

(137.9)

(221.3)

Net pension liability at end of year

^[1]

(137.9)

(221.3)

Net actuarial loss (gain)

532.0

447.2

Prior service cost

(8.9)

(12.7)

Total recognized in accumulated other comprehensive loss

523.1

434.5

Post-Retirement Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

PBO at beginning of year

(14.9)

(17.0)

Service cost

(0.1)

(0.2)

Interest cost

(0.7)

(0.8)

Participant contributions

(0.3)

(0.4)

Actuarial (loss) gain including assumption changes

1.9

2.1

Benefits paid

1.4

PBO at end of year

(12.7)

(14.9)

Contribution by the company

1.1

1.0

Funded status

(12.7)

(14.9)

Current liabilities

(1.1)

(1.3)

Non-current liabilities

(11.6)

(13.6)

Net pension liability at end of year

(12.7)

(14.9)

Net actuarial loss (gain)

(2.8)

(3.3)

Total recognized in accumulated other comprehensive loss

(2.8)

(3.3)

Change In Fair Value [Member] | Pension Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Benefits paid

(60.4)

(58.6)

Change In Fair Value [Member] | Post-Retirement Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Participant contributions

0.3

0.4

Benefits paid

$ (1.4)

[1]	In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.

Pension And Other Post-Retirement Benefits (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Pension Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Service cost

$ 9.1

$ 8.6

Interest cost

44.1

46.7

Net actuarial loss (gain)

109.3

25.4

$ 34.8

Amortization of net actuarial (loss) gain

(24.4)

(17.7)

(10.6)

Prior service cost

2.8

(12.4)

Amortization of prior service cost

0.9

(0.3)

Total recognized in other comprehensive earnings

88.6

8.6

11.5

Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings

93.5

19.1

19.8

Post-Retirement Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Service cost

0.1

0.2

Interest cost

0.7

0.8

Net actuarial loss (gain)

0.2

(2.1)

Amortization of net actuarial (loss) gain

0.4

Amortization of prior service cost

(0.1)

Total recognized in other comprehensive earnings

0.5

(1.8)

Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings

(1.1)

(1.2)

1.2

Pension Benefits, Net Periodic Benefit Cost [Member] | Pension Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Service cost

9.1

8.6

8.4

Interest cost

44.2

46.7

49.8

Expected return on plan assets

(70.6)

(61.6)

(60.8)

Net actuarial loss

24.4

17.7

10.6

Prior service cost

(0.9)

0.3

Curtailment and other one-time charges

(1.3)

Defined-benefit plan cost

4.9

10.5

8.3

Various U.S. defined contribution plans cost

5.6

5.8

6.5

Total

^[1]

10.5

16.3

14.8

Post-Retirement Benefits, Net Periodic Benefit Cost [Member] | Post-Retirement Benefits [Member]

Pension And Other Post-Retirement Benefits [Line Items]

Service cost

0.2

Interest cost

0.7

0.8

1.0

Net actuarial loss

(0.4)

Curtailment and other one-time charges

(2.1)

Defined-benefit plan cost

$ (1.6)

$ 0.6

$ 1.2

[1]	Includes $(1.6) million, $0 million and $0.5 million of defined benefit plan (expense) income and $0.9 million, $1.2 million and $1.7 million of defined contribution plans expense that were included in earnings from discontinued operations for 2011, 2010 and 2009, respectively.

Pension And Other Post-Retirement Benefits (Schedule Of Actuarial Assumptions Used To Determine Benefit Obligations) (Details)	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	4.90%	5.35%
Average salary increases	4.00%	4.00%
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	4.90%	5.35%
Average salary increases	4.00%	4.00%

Pension And Other Post-Retirement Benefits (Schedule Of Actuarial Assumptions Used To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2011 $ / shares	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Expected long-term return on plan assets	8.75%	8.75%	8.75%
Rate of compensation increase	4.00%	4.00%	4.00%
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Rate of compensation increase	4.00%	4.00%	4.00%
Pension Benefits, Net Periodic Benefit Cost [Member] \| Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	5.35%	5.80%	6.60%
Post-Retirement Benefits, Net Periodic Benefit Cost [Member] \| Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	5.35%	5.80%	6.60%

Pension And Other Post-Retirement Benefits (Schedule Of Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Abstract]
Health care cost trend rate assumed for next year	10.00%	10.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2016	2015

Pension And Other Post-Retirement Benefits (Schedule Of Weighted Asset Allocations By Asset Category) (Details)	Dec. 31, 2011	Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Abstract]
Equity securities	55.00%	62.00%
Debt securities	37.00%	30.00%
Private equity	5.00%	6.00%
Other	3.00%	2.00%
Total	100.00%	100.00%

Pension And Other Post-Retirement Benefits (Schedule Of Fair Value Measurement Of Plan Assets) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	$ 767.0	$ 640.3
Non-investment plan assets	2.0	0.5
Total plan assets	769.0	640.8
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	342.4	321.3
Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	350.0	268.4
Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	74.6	50.6	$ 57.6
Other Fixed Income Securities [Member] \| Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	0.2	0.2
Short-Term Investments [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	39.7	12.8
Short-Term Investments [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments		0.1
Short-Term Investments [Member] \| Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	39.7	12.7	28.2
Private Equity [Member] \| Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	34.7	37.7	$ 29.4
Preferred Stock [Member] \| Equity Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments		0.1
Preferred Stock [Member] \| Equity Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments		0.1
Common Stock [Member] \| Equity Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	267.6	279.0
Common Stock [Member] \| Equity Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	267.6	279.0
Commingled Equity Funds [Member] \| Equity Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	146.1	121.3
Commingled Equity Funds [Member] \| Equity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	146.1	121.3
Fixed Income Securities [Member] \| U.S. Treasury Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	74.8	42.2
Fixed Income Securities [Member] \| U.S. Treasury Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	74.8	42.2
Fixed Income Securities [Member] \| Government Agency Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	3.7	6.5
Fixed Income Securities [Member] \| Government Agency Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	3.7	6.5
Fixed Income Securities [Member] \| Corporate Asset Backed Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	3.1
Fixed Income Securities [Member] \| Corporate Asset Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	3.1
Fixed Income Securities [Member] \| Corporate Collateralized Mortgage Backed Securities And Collateralized Mortgage Obligations [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	1.2	2.4
Fixed Income Securities [Member] \| Corporate Collateralized Mortgage Backed Securities And Collateralized Mortgage Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	1.2	2.4
Fixed Income Securities [Member] \| Other Fixed Income Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	92.4	31.1
Fixed Income Securities [Member] \| Other Fixed Income Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	92.2	30.9
Fixed Income Securities [Member] \| Other Fixed Income Securities [Member] \| Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	0.2
Fixed Income Securities [Member] \| Commingled Fixed Income Funds [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	106.6	104.1
Fixed Income Securities [Member] \| Commingled Fixed Income Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	106.6	104.1
Other Types Of Investments [Member] \| Private Equity [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	34.7	37.7
Other Types Of Investments [Member] \| Private Equity [Member] \| Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	$ 34.7	$ 37.7

Pension And Other Post-Retirement Benefits (Schedule Of Reconciliation Of The Fair Value Measurements Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	$ 640.3
Plan assets at end of year	767.0	$ 640.3
Short-Term Investments [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	12.8
Plan assets at end of year	39.7	12.8
Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	50.6	57.6
Relating to assets still held at the reporting date	(4.4)	4.0
Relating to assets sold during the period	9.8	(0.1)
Purchases, sales and settlements	18.6	(11.1)
Transfers in and/or out of Level 3		0.2
Plan assets at end of year	74.6	50.6
Significant Nonobservable Inputs (Level 3) [Member] \| Short-Term Investments [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	12.7	28.2
Purchases, sales and settlements	27.0	27.0
Plan assets at end of year	39.7	12.7
Significant Nonobservable Inputs (Level 3) [Member] \| Other Fixed Income Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	0.2	0.2
Relating to assets still held at the reporting date
Relating to assets sold during the period
Purchases, sales and settlements
Transfers in and/or out of Level 3		0.2
Plan assets at end of year	0.2	0.2
Significant Nonobservable Inputs (Level 3) [Member] \| Private Equity [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	37.7	29.4
Relating to assets still held at the reporting date	(4.4)	4.0
Relating to assets sold during the period	9.8	(0.1)
Purchases, sales and settlements	(8.4)	4.4
Plan assets at end of year	$ 34.7	$ 37.7

Pension And Other Post-Retirement Benefits (Schedule Of Estimated Future Payments) (Details) $ in Millions	Dec. 31, 2011 USD ($)
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
2012	$ 59.8
2013	60.1
2014	60.1
2015	60.6
2016	60.8
Years 2017 - 2021	306.9
Post-Retirement Benefits[Member]
Pension And Other Post-Retirement Benefits [Line Items]
2012	1.0
2013	1.0
2014	1.0
2015	0.9
2016	0.9
Years 2017 - 2021	$ 4.2

Investment In RBC Shares (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 22, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment In RBC Shares [Abstract]
Proceeds from sale of business segment, shares	2,830
Value of shares from sale of business segment		$ 144.4
Unrealized after-tax gain on available for sale securities		1.2
Unrealized pretax gain on trading securities		1.2
Unrealized pretax gain on trading securities		$ 1.9

- Definition

Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain (loss), net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain (loss) at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains (losses) realized upon the sale of securities, after tax; and (3) the unrealized gains (losses) realized upon the write-down of securities, after tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The increase (decrease) resulting in a gain from the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e24584-111560

+ Details

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 21
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e24584-111560

+ Details

Ashland City, TN Facility Flood (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2010
Extraordinary Item [Line Items]
Flood related expense			$ 35.4
Carrying Value of fixed assets destroyed			14.0
Expense to repair and refurbish damaged equipment to pre-flood condition			22.1
Net inventory loss			16.4
Insurance proceeds			31.9
Site cleanup and restoration			14.8
Government assistance	$ 5.6		7.0
Ashland City, TN Plant Business Interruption Insurance [Member]
Extraordinary Item [Line Items]
Insurance proceeds			30.0
Federal Flood Insurance Policies [Member]
Extraordinary Item [Line Items]
Insurance policies recovered			$ 1.9
Cost Of Goods Sold [Member]
Extraordinary Item [Line Items]
Government assistance	1.3	$ 1.4
Other Income - Net [Member]
Extraordinary Item [Line Items]
Government assistance	2.3
Flood Related Expenses [Member]
Extraordinary Item [Line Items]
Government assistance	$ 2.0

Ashland City, TN Facility Flood (Schedule Of Flood Related Expense) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2010 USD ($)
Ashland City, TN Facility Flood [Abstract]
Repair or write off of buildings and equipment	$ 36.1
Net inventory loss	16.4
Site cleanup and restoration	14.8
Flood related expense	67.3
Less: insurance proceeds	31.9
Total flood related expense	$ 35.4

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Total taxes paid	$ 117.2	$ 12.3	$ 5.6
Undistributed earnings of foreign subsidiaries	633.9
Tax provision of foreign earnings recorded in discontinued operations	56.5
Undistributed foreign earnings reinvested	377.8
Cash and cash equivalents were held by foreign subsidiaries	463.3
Income tax provision or benefits made on foreign currency translation gains or losses	0.0
Charitable contribution carryover, valuation allowance	0.0
Unrecognized tax benefits that would affect the effective tax rate, if recognized	1.3
Interest and penalties accrued	0.5
Anticipated decrease in unrecognized tax benefits	$ 0.4
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryovers, expiration date	2014 through 2019
Tax credit carryovers, expiration date	2021
Income tax years under audit	2005-2011
State And Local [Member]
Income Taxes [Line Items]
Tax credit carryovers, expiration date	2012 and 2030
Income tax years under audit	2000-2011

Income Taxes (Components Of The Provision For Income Taxes From Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current, Federal	$ (28.0)	$ (2.9)	$ 16.0
Current, State	(5.2)	2.4	2.9
Current, International	4.9	14.1	12.9
Deferred, Federal	63.3	7.0	3.2
Deferred, State	11.9	0.5	(1.1)
Deferred, International	3.4	(3.8)	(3.0)
Provision for income taxes	$ 50.3	$ 17.3	$ 30.9

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Paragraph Question 1-7

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08.(h))
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's net foreign deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of applicable enacted tax laws of countries other than the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes (Difference Between Provision For Income Taxes And U.S. Federal Statutory Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Provision at U.S. federal statutory rate	35.00%	35.00%	35.00%
State income and franchise taxes, net of federal benefit	3.20%	1.60%	2.90%
International income tax rate differential	(4.30%)	(13.40%)	(6.20%)
Research tax credits	(0.60%)	(0.40%)	(0.70%)
State tax credits	(2.30%)
Other	0.10%	0.50%	2.70%
Total	31.10%	23.30%	33.70%

Income Taxes (Components Of Earnings From Continuing Operations Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
United States	$ 117.8	$ 12.4	$ 48.9
International	43.7	62.0	42.9
Earnings before provision for income taxes	$ 161.5	$ 74.4	$ 91.8

Income Taxes (Tax Effects Of Temporary Differences Of Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Employee benefits, Assets	$ 71.5	$ 95.0
Product liability and warranties, Assets	60.6	58.9
Inventories, Liabilities	3.3	3.3
Accounts receivable, Assets	9.6	7.4
Property, plant and equipment, Liabilities	35.1	29.9
Intangibles, Liabilities	29.1	28.7
Environmental, Assets	3.3	3.5
RBC stock and collar	8.5
Undistributed foreign earnings, Liabilities	56.5
Tax loss and credit carryovers, Assets	17.0	16.0
All other, Assets	0.4
All other, Liabilities		0.1
Valuation allowance, Assets	(8.4)	(1.9)
Assets	154.0	179.0
Liabilities	132.5	62.0
Net asset	$ 21.5	$ 117.0

Income Taxes (Balance Sheet Classification Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Current deferred income tax assets	$ 24.6	$ 27.3
Long-term deferred income tax (liabilities) assets	(3.1)	89.7
Net asset	$ 21.5	$ 117.0

- Definition

For entities that net deferred tax assets and tax liabilities, represents the net amount of deferred tax assets (after reduction for valuation allowance) and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities that are classified as current in the financial statements, or that are expected to reverse in the next twelve months (or normal operating cycle, if longer). A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference.

+ References + Details

- Definition

For entities that net deferred tax assets and tax liabilities, represents the net amount of deferred tax assets (after reduction for valuation allowance) and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities that are classified as noncurrent in the financial statements, or that are expected to reverse after the next twelve months (or beyond the normal operating cycle, if longer). A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference.

+ References + Details

Income Taxes (Reconciliation Of Tax Loss Carryovers, Credit Carryovers And Valuation Allowances) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Net Operating Losses and Tax Credits, Beginning balance	$ 16.0	$ 14.1
Net Operating Losses and Tax Credits, Additions	10.3	1.9
Net Operating Losses and Tax Credits, Reductions	(9.3)
Net Operating Losses and Tax Credits, Ending balance	17.0	16.0
Balance at Beginning of Year	1.9	1.5
Valuation Allowances, Additions	6.6	0.4
Valuation Allowances, Reductions	(0.1)
Balance at End of Year	$ 8.4	$ 1.9

Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Balance at January 1	$ 2.0	$ 3.8
Additions based on tax positions related to the current year		0.1
Reductions for tax positions of prior years	(0.2)	(1.9)
Balance at December 31	$ 1.8	$ 2.0

Commitments And Contingencies (Details) $ in Millions	12 Months Ended
Commitments And Contingencies (Details) $ in Millions	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Commitments And Contingencies [Abstract]
Number of judicial and administrative proceedings for which the company is responsible	14
Product liability insurance for individual losses in excess of accrual amount	$ 125	$ 125
Amounts in excess to be covered by third party insurance	$ 5	$ 5

Operations By Segment (Narrative) (Details) $ in Millions	12 Months Ended
Operations By Segment (Narrative) (Details) $ in Millions	Dec. 31, 2011 segments	Dec. 31, 2011	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Segment Reporting Information [Line Items]
Number of reporting segments	2	2
Equity loss in joint venture					$ 0.4
Customer One [Member]
Segment Reporting Information [Line Items]
Sales percentage	16.00%	16.00%	16.00%	16.00%
Customer One [Member] \| North America [Member]
Segment Reporting Information [Line Items]
Sales to a largest customer			$ 273.1	$ 237.9
Customer Two [Member]
Segment Reporting Information [Line Items]
Sales percentage	11.00%	11.00%	11.00%	12.00%
Customer Two [Member] \| North America [Member]
Segment Reporting Information [Line Items]
Sales to a largest customer			$ 194.7	$ 177.3

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 19
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 6
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.12)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 7

+ Details

Operations By Segment (Schedule Of Operating Earnings) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net Sales	$ 475.8	$ 412.0	$ 405.3	$ 417.4	$ 370.2	$ 377.4	$ 375.0	$ 366.7	$ 1,710.5	$ 1,489.3	$ 1,375.0
Earnings									196.5	132.9	148.9
General corporate and research and development expenses									(25.7)	(51.6)	(50.3)
Interest expense									(9.3)	(6.9)	(7.2)
Earnings before income taxes									161.5	74.4	91.4
Provision for income taxes									(50.3)	(17.3)	(30.9)
Earnings from continuing operations	$ 31.5	$ 26.9	$ 28.6	$ 24.2	$ 20.5	$ 16.2	$ (0.9)	$ 21.3	111.2	57.1	60.5
North America [Member]
Segment Reporting Information [Line Items]
Net Sales									1,289.5	1,155.4	1,135.9
Earnings									154.0	91.2	115.8
Rest Of World [Member]
Segment Reporting Information [Line Items]
Net Sales									455.6	368.9	256.5
Earnings									42.7	42.4	33.0
Inter-Segment [Member]
Segment Reporting Information [Line Items]
Net Sales									(34.6)	(35.0)	(17.4)
Earnings									$ (0.2)	$ (0.7)	$ 0.1

Operations By Segment (Schedule Of Assets, Depreciation And Capital Expenditures By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Total Assets	$ 2,349.0	$ 2,110.6	$ 1,973.0
Depreciation and Amortization	47.0	40.8	38.3
Capital Expenditures	53.5	53.5	42.7
EPC Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total Assets		671.6	642.4
Depreciation and Amortization
Capital Expenditures
Corporate Assets [Member]
Segment Reporting Information [Line Items]
Total Assets	687.4	271.0	235.2
Depreciation and Amortization	0.7	0.6	0.5
Capital Expenditures	1.4	1.9	0.7
North America [Member]
Segment Reporting Information [Line Items]
Total Assets	1,319.2	868.3	826.9
Depreciation and Amortization	33.9	30.2	32.2
Capital Expenditures	31.6	37.8	26.9
Rest Of World [Member]
Segment Reporting Information [Line Items]
Total Assets	342.4	299.7	268.5
Depreciation and Amortization	12.4	10.0	5.6
Capital Expenditures	$ 20.5	$ 13.8	$ 15.1

Operations By Segment (Schedule Of Net Sales And Long-Lived Assets By Geographic Location) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 341.8				$ 283.7				$ 341.8	$ 283.7	$ 271.4
Net Sales	475.8	$ 412.0	$ 405.3	$ 417.4	370.2	$ 377.4	$ 375.0	$ 366.7	1,710.5	1,489.3	1,375.0
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	218.2				173.2				218.2	173.2	169.2
Net Sales									1,094.3	960.4	959.0
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	70.7				57.1				70.7	57.1	53.3
Net Sales									382.2	304.4	222.0
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	20.9				22.2				20.9	22.2	22.5
Net Sales									160.2	160.4	150.4
Other Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 32.0				$ 31.2				32.0	31.2	26.4
Net Sales									$ 73.8	$ 64.1	$ 43.6

Quarterly Results Of Operations (Schedule Of Quarterly Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Results Of Operations [Abstract]
Net sales	$ 475.8	$ 412.0	$ 405.3	$ 417.4	$ 370.2	$ 377.4	$ 375.0	$ 366.7	$ 1,710.5	$ 1,489.3	$ 1,375.0
Gross profit	155.0	118.7	111.9	127.0	116.3	107.2	114.2	108.3	512.6	446.0	394.9
Earnings, Continuing operations	31.5	26.9	28.6	24.2	20.5	16.2	(0.9)	21.3	111.2	57.1	60.5
Earnings, Discontinued operations	0.6	155.4	21.7	16.8	11.6	15.8	17.5	9.5	43.0	54.4	29.1
Net Earnings	32.1	182.3	50.3	41.0	32.1	32.0	16.6	30.8	305.7	111.5	89.6
Continuing operations					0.1			0.1		0.2	(9.6)
Discontinued operations											1.3
Net earnings attributable to A. O. Smith Corporation	$ 32.1	$ 182.3	$ 50.3	$ 41.0	$ 32.2	$ 32.0	$ 16.6	$ 30.9	$ 305.7	$ 111.7	$ 81.3
Basic earnings (loss) per share, Continuing operations	$ 0.68	$ 0.58	$ 0.62	$ 0.52	$ 0.45	$ 0.35	$ (0.02)	$ 0.47	$ 2.41	$ 1.25	$ 1.48
Basic earnings (loss) per share, Discontinued operations	0.01	3.36	0.47	0.37	0.25	0.35	0.38	0.21	4.22	1.19	0.89
Basic earnings (loss) per share, Net	0.69	3.94	1.09	0.89	0.70	0.70	0.36	0.68	6.63	2.44	2.37
Diluted earnings (loss) per share, Continuing operations	0.68	0.58	0.62	0.52	0.44	0.35	(0.02)	0.46	2.39	1.24	1.48
Diluted earnings (loss) per share, Discontinued operations	0.01	3.33	0.46	0.36	0.25	0.34	0.38	0.21	4.18	1.18	0.88
Diluted earnings (loss) per share, Net	0.69	3.91	1.08	0.88	0.69	0.69	0.36	0.67	$ 6.57	$ 2.42	$ 2.36
Common dividends declared	$ 0.16	$ 0.16	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.13	$ 0.13

Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 1.9	$ 1.5
Acquisition of Businesses	6.6	0.4
Deductions2	(0.1)
Balance at End of Year	8.4	1.9	$ 1.5
Valuation Allowance For Trade And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	3.5	3.4	2.8
Charged to Costs and Expenses1	0.8	0.2	1.7
Acquisition of Businesses	0.3
Deductions2	(1.2)	(0.1)	(1.1)
Balance at End of Year	3.4	3.5	3.4
Valuation Allowance For Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	1.9	1.5	0.5
Charged to Costs and Expenses1	6.6	0.4	1.0
Deductions2	(0.1)
Balance at End of Year	$ 8.4	$ 1.9	$ 1.5