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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2012	Oct. 31, 2012
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Trading Symbol	AOS
Entity Registrant Name	SMITH A O CORP
Entity Central Index Key	0000091142
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		39,542,302
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,626,068

Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Continuing Operations
Net sales	$ 462.2	$ 412.0	$ 1,415.0	$ 1,234.7
Cost of products sold	305.4	293.3	948.6	877.1
Gross profit	156.8	118.7	466.4	357.6
Selling, general and administrative expenses	111.5	92.2	325.7	266.6
Contingent consideration adjustment	(6.4)		(6.4)
Settlement income				(11.2)
Interest expense	1.9	2.5	7.1	6.4
Other income	(2.2)	(15.8)	(32.5)	(18.7)
Pre-tax earnings from acquisitions included in operations	52.0	39.8	172.5	114.5
Provision for income taxes	15.0	12.9	53.1	34.8
Earnings from continuing operations	37.0	26.9	119.4	79.7
Discontinued Operations
Earnings from discontinued EPC operations, less provision for income taxes of $0.4 and $14.9 in 2011		5.1		43.6
Gain on sale of discontinued EPC operations less provision for income taxes of $143.5 and $143.5 in 2011		150.3		150.3
Net earnings	$ 37.0	$ 182.3	$ 119.4	$ 273.6
Net Earnings Per Share of Common Stock
Continuing Operations	$ 0.80	$ 0.58	$ 2.59	$ 1.73
Discontinued Operations		3.36		4.20
Net Earnings	0.80	3.94	2.59	5.93
Diluted Net Earnings Per Share of Common Stock
Continuing Operations	0.79	0.58	2.57	1.71
Discontinued Operations		3.33		4.16
Net Earnings	0.79	3.91	2.57	5.87
Dividends per share of Common Stock	$ 0.20	$ 0.16	$ 0.52	$ 0.44

Condensed Consolidated Statements of Earnings (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Earnings from discontinued EPC operations, less provision for income taxes	$ 0.4	$ 14.9
Gain on sale of discontinued EPC operations, less provision for income taxes	$ 143.5	$ 143.5

- Definition

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.

+ References + Details

Condensed Consolidated Statements of Comprehensive Earnings - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net earnings	$ 37.0	$ 182.3	$ 119.4	$ 273.6
Other comprehensive earnings (loss)
Foreign currency translation adjustments	6.1	(16.0)	3.1	(9.6)
Unrealized net (loss) gain) on cash flow derivative instruments, less related income tax benefit (provision) of $0.1 and $(0.2) in 2012, $2.9 and $6.5 in 2011	(0.1)	(4.4)	0.3	(10.2)
Adjustment to additional minimum pension liability loss related income tax benefit of $1.5 and $1.5 in 2012	(3.4)		(3.4)
Unrealized losses on investments less related tax benefit of $0.7 in 2012 and $2.3 and $2.3 in 2011		(3.7)	(1.2)	(3.7)
Comprehensive Earnings	$ 39.6	$ 158.2	$ 118.2	$ 250.1

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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+ Details

- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Condensed Consolidated Statements of Comprehensive Earnings (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unrealized net (loss) gain) on cash flow derivative instruments, related income tax benefit (provision)	$ 0.1	$ 2.9	$ (0.2)	$ 6.5
Adjustment to additional minimum pension liability loss, related income tax benefit	1.5		$ 1.5
Unrealized gain on investments, related tax benefit	$ 0.7	$ 2.3		$ 2.3

- Definition

Tax effect, net of reclassification adjustments, of the change in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity.

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+ Details

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 279.6	$ 463.4
Marketable securities	202.6
Receivables	369.1	368.4
Inventories	178.2	168.4
Deferred income taxes	32.5	24.6
Investments		162.4
Other current assets	26.4	21.5
Total Current Assets	1,088.4	1,208.7
Property, plant and equipment	656.8	614.0
Less accumulated depreciation	325.7	298.7
Net property, plant and equipment	331.1	315.3
Goodwill	435.9	433.8
Other intangibles	342.6	352.7
Other assets	37.3	38.5
Total Assets	2,235.3	2,349.0
Liabilities
Trade payables	289.4	302.5
Accrued payroll and benefits	44.1	41.9
Accrued liabilities	62.5	74.1
Product warranties	43.9	43.7
Long-term debt due within one year	18.6	18.6
Current liabilities - discontinued EPC operations	4.3	31.5
Total Current Liabilities	462.8	512.3
Long-term debt	261.0	443.0
Pension liabilities	153.7	139.5
Other liabilities	157.5	159.7
Long-term liabilities - discontinued EPC operations	8.9	8.7
Total Liabilities	1,043.9	1,263.2
Stockholders' Equity
Class A Common Stock, $5 par value: authorized 14,000,000 shares; issued 6,659,943 and 7,250,791	33.3	36.3
Common Stock, $1 par value: authorized 60,000,000 shares; issued 41,016,968 and 40,426,119	41.0	40.4
Capital in excess of par value	653.5	652.5
Retained earnings	825.2	729.9
Accumulated other comprehensive loss	(302.1)	(300.9)
Treasury stock at cost	(59.5)	(72.4)
Total Stockholders' Equity	1,191.4	1,085.8
Total Liabilities and Stockholders' Equity	$ 2,235.3	$ 2,349.0

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2012	Dec. 31, 2011
Class A Common Stock, par value	$ 5	$ 5
Class A Common Stock, authorized	14,000,000	14,000,000
Class A Common Stock, issued	6,659,943	7,250,791
Common Stock, par value	$ 1	$ 1
Common Stock, authorized	60,000,000	60,000,000
Common Stock, shares issued	41,016,968	40,426,119

Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities
Net earnings	$ 119.4	$ 273.6
Less earnings from discontinued operations		(193.9)
Adjustments to reconcile earnings from continuing operations to cash provided by (used in) operating activities:
Depreciation and amortization	40.4	33.2
Loss on disposal of assets	0.8	0.7
Gain on sale of investments	(27.2)	(20.1)
Net changes in operating assets and liabilities, net of acquisitions:
Current assets and liabilities	(45.3)	(65.8)
Noncurrent assets and liabilities	12.6	(95.6)
Cash Provided by (Used in) Operating Activities - continuing operations	100.7	(67.9)
Cash Used in Operating Activities - discontinued operations	(27.0)	(1.5)
Cash Provided by (Used in) Operating Activities	73.7	(69.4)
Investing Activities
Capital expenditures	(44.5)	(36.7)
Acquisition of businesses		(418.1)
Investments in marketable securities	(237.8)
Net proceeds from sale of securities	227.8
Cash Used in Investing Activities - continuing operations	(54.5)	(454.8)
Cash Provided by Investing Activities - discontinued operations		727.8
Cash (Used in) Provided by Investing Activities	(54.5)	273.0
Financing Activities
Long-term debt (retired) incurred	(183.1)	134.3
Common stock repurchases	(9.7)	(5.7)
Net proceeds from stock option activity	13.8	9.8
Dividends paid	(24.0)	(20.3)
Cash (Used in) Provided by Financing Activities - continuing operations	(203.0)	118.1
Cash Provided by Financing Activities - discontinued operations
Cash (Used in) Provided by Financing Activities	(203.0)	118.1
Net (decrease) increase in cash and cash equivalents	(183.8)	321.7
Cash and cash equivalents - beginning of period	463.4	118.9
Cash and Cash Equivalents - End of Period	$ 279.6	$ 440.6

Basis of Presentation

9 Months Ended

Sep. 30, 2012

Basis of Presentation

1.	Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all of the information and footnotes required for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and nine month periods ended September 30, 2012 are not necessarily indicative of the results expected for the full year. It is suggested that the accompanying condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the company’s latest Annual Report on Form 10-K filed with the SEC on February 27, 2012.

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

Certain other prior year amounts have been reclassified to conform to the 2012 presentation.

Recent Accounting Pronouncements

In September 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-08, “Testing of Goodwill for Impairment (Topic 350)”. ASU No. 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. ASU 2011-08 will be effective for the year ending December 31, 2012. Adoption of this ASU will not have an impact on the company’s consolidated financial condition, results of operations or cash flows.

In July 2012, the FASB issued ASU 2012-02, “Testing Indefinite-Lived Intangible Assets for Impairment.” ASU 2012-02 allows an entity to first assess qualitative factors in determining whether events and circumstances indicate that it is more-likely-than not that an indefinite-lived intangible asset is impaired. If an entity determines that it is not more-likely-than not that the indefinite-lived intangible asset is impaired, then the entity is not required to perform a quantitative impairment test. ASU 2012-02 will be effective for the year ending December 31, 2013. Adoption of this ASU will not have an impact on the company’s consolidated financial condition, results of operations or cash flows.

- Definition

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

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-Publisher FASB
-Name FASB Interpretation (FIN)
-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 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

Acquisition

9 Months Ended

Sep. 30, 2012

Acquisition

2.	Acquisition

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 commercial and residential applications located in Lebanon, Tennessee. The addition of Lochinvar expanded the company’s product offerings and gave the company access to proven

high-efficiency boiler technology. Lochinvar is included in the company’s North America segment except for a relatively immaterial amount from a Lochinvar U.K. subsidiary which is included in the company’s Rest of World 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, the fair value of the contingent payment had been estimated at $16.8 million. As of September 30, 2012, the fair value of the contingent payment was estimated at $10.4 million which resulted in a pre-tax gain of $6.4 million being recorded by the company during the three months ended September 30, 2012

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 was assigned to trade names that are not subject to amortization and $152.5 million was assigned to customer lists which are being amortized over 19 years, and the remaining $2.3 million was 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 the three months ended September 30, 2012 totaled $63.4 million and $15.2 million, respectively. Revenues and pretax earnings associated with Lochinvar included in the nine months ended September 30, 2012 totaled $167.5 million and $35.7 million, respectively. Revenues and pretax net loss associated with Lochinvar included in operations from the acquisition date through September 30, 2011 totaled $20.8 million and $2.0 million, respectively which included $3.0 million of operating earnings less $4.4 million of acquisition costs and $0.6 million of interest expense.

The following table represents the pro forma unaudited results of operations for the company for three and the nine months ended September 30, 2011 assuming consummation of the purchase of Lochinvar as of January 1, 2011:


	(dollars in millions except per share data)
	Three Months Ended September 30, 2011		Nine Months Ended September 30, 2011
Net sales	$	441.1	$	1,358.1
Earnings from continuing operations		27.7		92.7
Earnings per common share:
Basic	$	0.60	$	2.01

Diluted	$	0.59	$	1.99

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 trade names, 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 purchase been made as of the beginning of the period presented or of the results of operations that may occur in the future.

- 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 Accounting Standards Codification
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-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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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-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 19: http://www.xbrl.org/2003/role/presentationRef
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-Number 141R
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-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

9 Months Ended

Sep. 30, 2012

Discontinued Operations

3.	Discontinued Operations

On August 22, 2011, the company completed the sale of its Electrical Products Company (EPC) to Regal Beloit Corporation (RBC) for $759.9 million in cash and approximately 2.83 million of RBC shares. Included in the $759.9 million of cash was a final working capital adjustment of $7.4 million which was paid to the company by RBC in January 2012. The value of the RBC shares on the date of the closing of the sale was $140.6 million. See Note 14 for further discussion regarding the company’s investment in RBC stock. The company paid $31.1 million in income taxes and $3.3 million of other sale related expenses in the nine months ended September 30, 2012 and estimates it will pay an additional $2.5 million of income taxes in 2012.

As a part of the sale of EPC, the company recorded 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 other long term liabilities in continuing operations.

The results of EPC have been reported separately as discontinued operations of the company for all periods presented.

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


	(dollars in millions)
	Three Months Ended September 30,			Nine Months Ended September 30,
	2011			2011
Net sales	$	109.5		$	531.8
Cost of products sold		87.4			415.6

Gross profit		22.1			116.2
Selling, general and administrative expenses		16.8			61.5
Interest expense		0.4			2.2
Other income		(0.6	)		(6.0	)

		5.5			58.5
Provision for income taxes		0.4			14.9

Net earnings	$	5.1		$	43.6

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

Nine months ended September 30, 2011 (dollars in millions)


Operating Activities
Earnings	$	43.6
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5
Gain on sale of assets		(4.8	)
Net changes in operating assets and liabilities
Current assets and liabilities		(55.9	)
Noncurrent assets and liabilities		0.9
Other		(1.8	)

Cash Used in Discontinued Operating Activities		(1.5	)
Investing Activities
Capital expenditures		(10.6	)
Proceeds from sale of assets		6.1
Proceeds from sale of operations		752.5
Payments associated with sale		(20.2	)

Cash Provided by Discontinued Investing Activities		727.8

Cash Flow Provided by Discontinued Operations	$	726.3

- 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 Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: 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.

+ Details

Inventories

9 Months Ended

Sep. 30, 2012

Inventories

4.	Inventories

The following table presents the components of the company’s inventory balances:


	(dollars in millions)
	September 30, 2012			December 31, 2011
Finished products	$	85.7		$	85.6
Work in process		11.6			10.6
Raw materials		106.0			98.9

		203.3			195.1
LIFO reserve		(25.1	)		(26.7	)

	$	178.2		$	168.4

Long-Term Debt

9 Months Ended

Sep. 30, 2012

Long-Term Debt

5.	Long-Term Debt

The company has a $425 million multi-currency revolving credit agreement with eight banks. The facility expires on November 13, 2013 and has an accordion provision which allows it to be increased up to $525 million if certain conditions (including lender approval) are satisfied. Interest rates on borrowings under the facility are determined in part based upon the company’s leverage ratio.

Borrowings under bank credit lines and commercial paper borrowings are supported by the company’s $425 million 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 September 30, 2012.

Product Warranties

9 Months Ended

Sep. 30, 2012

Product Warranties

6.	Product Warranties

The company offers warranties on the sales of certain of its products and records an accrual for the estimated future claims. The following table presents the company’s warranty liability activity.


	(dollars in millions)
	Nine Months Ended September 30,
	2012			2011
Balance at January 1	$	131.9		$	112.1
Lochinvar acquisition		—			5.8
Expense		42.7			49.6
Net increase in warranty reserve due to settlement		—			7.5
Claims settled		(42.0	)		(42.8	)

Balance at September 30	$	132.6		$	132.2

See Note 15 for discussion on the increase in warranty reserve due to settlement and the increase in warranty expense and reserve associated with component parts in Canada.

Earnings per Share of Common Stock

9 Months Ended

Sep. 30, 2012

Earnings per Share of Common Stock

7.	Earnings per Share of Common Stock

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:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Denominator for basic earnings per share - weighted average shares		46,193,952		46,221,603		46,190,965		46,137,918
Effect of dilutive stock options		375,140		420,920		352,883		472,871

Denominator for diluted earnings per share		46,569,092		46,642,523		46,543,848		46,610,789

Stock Based Compensation

9 Months Ended

Sep. 30, 2012

Stock Based Compensation

8.	Stock Based Compensation

The company adopted the A. O. Smith Combined Incentive Compensation Plan (the “plan”) effective January 1, 2007. The plan was reapproved on April 16, 2012. The plan is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by stockholders in 2002. The number of shares available for granting of options, restricted stock or share units under the plan at September 30, 2012 was 1,633,604. Upon stock option exercise or share unit vesting, shares are issued from treasury stock.

Total stock based compensation cost recognized in the three months ended September 30, 2012 and 2011 was $1.5 million and $1.1 million, respectively. Total stock based compensation cost recognized in the nine months ended September 30, 2012 and 2011 was $5.3 million and $4.6 million, respectively.

Stock Options

The stock options granted in the nine months ended September 30, 2012 and 2011 have 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 2012 and 2011 expire ten years after date of grant. Options are expensed ratably over the three year vesting period. Stock based compensation cost attributable to stock options in the three months ended September 30, 2012 and 2011 was $0.7 million and $0.5 million, respectively. Stock based compensation expense attributable to stock options in the nine months ended September 30, 2012 and 2011 was $2.5 million and $2.3 million, respectively. Included in the stock option expense for the nine months ended September 30, 2012 and 2011 was 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 awards, all of which relate to Common Stock, were as follows for the nine months ended September 30, 2012:


	Weighted-Average Per Share Exercise Price		Nine Months Ended September 30, 2012			Average Remaining Contractual Life		Aggregate Intrinsic Value (dollars in millions)

Outstanding at January 1, 2012	$	24.84		1,421,867

Granted		45.97		191,000

Exercised		23.10		(482,308	)

Forfeited		42.89		(4,083	)


Outstanding at September 30, 2012		29.10		1,126,476			7 years	$	32.0


Exercisable at September 30, 2012		23.14		768,995			7 years	$	26.5

The weighted-average fair value per option at the date of grant during the nine months ended September 30, 2012 and 2011 using the Black-Scholes option-pricing model was $16.52 and $16.51, respectively. Assumptions were as follows:


	Nine Months Ended September 30,
	2012			2011
Expected life (years)		6.2			6.4
Risk-free interest rate		2.0	%		3.6	%
Dividend yield		1.4	%		1.3	%
Expected volatility		39.4	%		38.4	%

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 expected life of the option. The actual dividend yield is based on the actual annual dividends divided by the grant date market value of the company’s common stock. The expected volatility is based on the historical volatility of the company’s 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 83,900 and 75,625 share units under the plan in the nine months ended September 30, 2012 and 2011, respectively. The share units were valued at $3.9 million and $3.3 million at the date of issuance in 2012 and 2011, respectively, based on the company’s stock price at the date of grant and will be recognized as compensation expense ratably over the three-year vesting period. Share based compensation expense attributable to share units of $0.8 million and $0.6 million was recognized in the three months ended September 30, 2012 and 2011, respectively. Share based compensation expense attributable to share units of $2.8 million and $2.3 million was recognized in the nine months ended September 30, 2012 and 2011, respectively. Share based compensation expense recognized in the nine months ended September 30, 2012 and 2011 included expense associated with accelerated vesting of share unit awards for certain employees who either are retirement eligible or will 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
Issued and unvested at January 1, 2012		286,554		$	27.36

Granted		83,900			45.97

Vested		(132,974	)		18.80

Forfeited		(3,004	)		37.42


Issued and unvested at September 30, 2012		234,476			38.74

- 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 Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
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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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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: 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 8: 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.

+ Details

Pensions

9 Months Ended

Sep. 30, 2012

Pensions

9.	Pensions

The following table presents the components of the company’s net pension expense:


	(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Service cost	$	1.9		$	2.2		$	5.8		$	7.1
Interest cost		10.9			10.6			32.6			33.1
Expected return on plan assets		(17.2	)		(17.8	)		(51.6	)		(52.8	)
Amortization of unrecognized loss		8.1			6.6			24.1			17.8
Amortization of prior service cost		(0.2	)		(0.2	)		(0.6	)		(0.6	)

Ongoing expense		3.5			1.4			10.3			4.6
Curtailment/settlement credit		-			(0.6	)		-			(0.6	)

Defined benefit plan expense	$	3.5		$	0.8		$	10.3		$	4.0

The company made the pension plan contributions totaling $175.0 million in 2011 and does not anticipate making a contribution in 2012. Included in the table above is $0.6 million and $1.6 million of defined benefit plan expense associated with the company’s discontinued operations for the three and nine months ended September 30, 2011, respectively.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: 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 3: 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 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-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)
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-Paragraph 5
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-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 FASB
-Name Statement of Financial Accounting Standard (FAS)
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-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
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-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
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Operations by Segment

9 Months Ended

Sep. 30, 2012

Operations by Segment

10.

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 revised its segment reporting in the fourth quarter of 2011 and determined that it was comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless 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 for China.

The company’s operations by segment are as follows:


	(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net sales
North America	$	335.7		$	310.2		$	1,054.9		$	935.5
Rest of World		133.8			110.5			385.3			326.1
Inter-segment sales		(7.3	)		(8.7	)		(25.2	)		(26.9	)

	$	462.2		$	412.0		$	1,415.0		$	1,234.7

Operating earnings
North America^{(1), (2), (3)}	$	50.7		$	30.9		$	144.1		$	107.3
Rest of World		12.7			9.0			39.2			30.8

		63.4			39.9			183.3			138.1
Corporate (expense) income ⁽⁴⁾		(9.5	)		2.4			(3.7	)		(17.2	)
Interest expense		(1.9	)		(2.5	)		(7.1	)		(6.4	)

Earnings before income taxes		52.0			39.8			172.5			114.5
Provision for income taxes		15.0			12.9			53.1			34.8

Earnings from continuing operations	$	37.0		$	26.9		$	119.4		$	79.7

⁽¹⁾ Includes settlement income of	$	-		$	-		$	-		$	11.2
⁽²⁾ Includes Canadian warranty expense of		-			-			-			(8.2	)
⁽³⁾ Includes contingent consideration adjustment of		6.4			-			6.4			-
⁽⁴⁾ Includes net gain on investments of		-			16.4			27.2			20.1

- 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
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: 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.

+ Details

Fair Value Measurements

9 Months Ended

Sep. 30, 2012

Fair Value Measurements

11.

Fair Value Measurements

The company adopted Accounting Standards Codification (ASC) 820 Fair Value Measurements and Disclosures (formerly Statement of Financial Accounting Standards (SFAS) No. 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.

Continuing 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.

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


Fair Value Measurement Using	September 30, 2012		December 31, 2011
Quoted prices in active markets for identical assets (Level 1)	$	202.7	$	144.2
Significant other observable inputs (Level 2)		-		17.8

Total assets measured at fair value	$	202.7	$	162.0

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

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-Paragraph 15B
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-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
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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+ Details

Derivative Instruments

9 Months Ended

Sep. 30, 2012

Derivative Instruments

12.

Derivative Instruments

ASC 815 Derivatives and Hedging (formerly SFAS No. 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 as well as raw materials price risk. The company had previously utilized a derivative instrument to manage 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.

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 British pound, Canadian dollar, Chinese renminbi, Euro and Mexican peso.

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 31, 2013. Contracts related to the company’s discontinued operations that expired after the closing date no longer qualified for hedge accounting; therefore, the change in valuation from January 1, 2011 through August 22, 2011 of $3.2 million was recorded as income in earnings from discontinued operations.

The following table summarizes, by currency, the contractual amounts of the company’s foreign currency forward contracts for continuing operations:


September 30, (dollars in millions)	2012						2011
	Buy			Sell			Buy			Sell
British pound		$	-		$	2.2		$	-		$	-
Canadian dollar			-			39.2			-			40.4
Chinese renminbi			4.6			-			-			-
Euro			29.9			2.3			7.8			1.8
Mexican peso			11.6			-			14.4			-

Total		$	46.1		$	43.7		$	22.2		$	42.2

Commodity Futures Contracts

In addition to entering into supply arrangements in the normal course of business, the company, primarily for its discontinued operation prior to its disposition, also entered 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 commodity futures contracts on the open market of the London Metals Exchange (LME) or over the counter contracts based on the LME.

The minimal after-tax gain on the effective portion of the contracts as of September 30, 2012 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 operations that expired after the closing date no longer qualified for hedge accounting; therefore, the change in valuation from January 1, 2011 to August 22, 2011 was minimal and was recorded in earnings from discontinued operations. Commodity hedges outstanding at September 30, 2012 involve a total of approximately 0.2 million pounds of copper.

Equity Collar Contract

As discussed in Note 3, 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 collar was $63.29 and the call strike price of the collar was $77.32. The collar did not qualify for hedge accounting and therefore was adjusted to fair value on a quarterly basis through earnings from continuing operations. The mark to market accounting for the RBC shares and hedge continued until the equity collar contract expired in March of 2012 with no value.

The impact of derivative contracts on the company’s financial statements is as follows:

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


(dollars in millions)	Balance Sheet Location	September 30, 2012				December 31, 2011

Commodities contracts	Accrued liabilities		$	-			$	(0.1	)
Foreign currency contracts	Accrued liabilities			(0.9	)			(1.6	)
	Other current assets			1.0				1.3

Total derivatives designated as hedging instruments			$	0.1			$	(0.4	)


Fair value of derivative not designated as a hedging instrument under ASC 815 in continuing operations:

(dollars in millions)	Balance Sheet Location			September 30, 2012				December 31, 2011

Equity collar contract	Investments		$	-			$	17.9

Total derivatives not designated as hedging instruments			$	-			$	17.9

The effect of derivatives designated as hedging instruments under ASC 815 on the Statement of Earnings for continuing and discontinued operations:

Three months ended September 30, (dollars in millions)


Derivatives in ASC 815 cash flow hedging relationships	Amount of gain/(loss) recognized in OCI on derivative (effective portion)						Location of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)					Location of gain/(loss) recognized in earnings on derivative (ineffective portion)	Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
	2012			2011				2012			2011			2012		2011
Commodities contracts	$	(0.1	)	$	(2.8	)	Cost of products sold	$	-		$	0.1	Cost of products sold	$	-	$	-
							Discontinued operations		-			1.0	Discontinued operations		-		-
							Gain on sale of EPC		-			1.8			-		-
Foreign currency contracts		(0.3	)		(0.1	)	Cost of products sold		(0.2	)		-	N/A		-		-
		-			-		Discontinued operations		-			2.0	Discontinued operations		-		-
		-			-		Gain on sale of EPC		-			5.2			-		-

	$	(0.4	)	$	(2.9	)		$	(0.2	)	$	10.1		$	-	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of gain/(loss) recognized in earnings from continuing operations on derivative		Amount of gain/(loss) recognized in earnings from continuing operations on derivative
				2012		2011
Equity collar contract		Other income	$	-	$	22.4

Three months ended September 30, (dollars in millions)


Derivatives in ASC 815 cash flow hedging relationships	Amount of gain/(loss) recognized in OCI on derivative (effective portion)						Location of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)					Location of gain/(loss) recognized in earnings on derivative (ineffective portion)	Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
	2012			2011				2012			2011			2012		2011
Commodities contracts	$	(0.1	)	$	(3.0	)	Cost of products sold	$	(0.1	)	$	-	Cost of products sold	$	-	$	0.1
							Discontinued operations		-			7.0	Discontinued operations		-		-
							Gain on sale of EPC		-			1.8			-		-
Foreign currency contracts		(0.4	)		4.9		Cost of products sold		(0.8	)		0.1	N/A		-		-
		-			-		Discontinued operations		-			6.9	Discontinued operations		-		-
							Gain on sale of EPC		-			5.2			-		-

	$	(0.5	)	$	(1.9	)		$	(0.9	)	$	21.0		$	-	$	0.1


Derivatives not designated as a hedging instrument under ASC 815	Location of gain/(loss) recognized in earnings from continuing operations on derivative			Amount of gain/(loss) recognized in earnings from continuing operations on derivative
					2012			2011
Equity collar contract		Other	(expense) income	$	(17.9	)	$	26.1

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 45
-Paragraph 1
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-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 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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-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

9 Months Ended

Sep. 30, 2012

Income Taxes

13.

Income Taxes

The company’s effective tax rate for the three and nine months ended September 30, 2012 was 28.8 percent and 30.8 percent, respectively. The company estimates that the tax rate for the fourth quarter of 2012 will be approximately 30.0 percent. The company’s full year effective tax rate for 2011 was 31.1 percent.

As of September 30, 2012, the company had $1.5 million of unrecognized tax benefits from continuing operations of which $1.0 million would affect its effective tax rate if recognized. The company recognizes potential interest and penalties related to unrecognized tax benefits as a component of tax expense.

The company’s U.S. federal tax returns for 2008 - 2011 are subject to audit. The company is subject to various state and local audits for tax years 2000 - 2011. The company is also 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 FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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-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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: 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.

+ Details

Investment in RBC Shares

9 Months Ended

Sep. 30, 2012

Investment in RBC Shares

14.

Investment in RBC Shares

As discussed in Note 3, the company received approximately 2.83 million of RBC shares as 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 company’s RBC shares were classified as available for sale securities and were recorded at fair value with an unrealized after-tax gain of $1.2 million included in other comprehensive earnings as of December 31, 2011. The company entered into an equity collar contract for the remaining half of its RBC shares which were classified as trading securities. Those shares were also recorded at fair value. See Note 12 for further discussion regarding the equity collar. During the first quarter of 2012, the company sold all of its RBC shares for net proceeds of $187.6 million or an average price of $66.19 per share. A pre-tax gain of $27.2 million was recorded in other income in the condensed consolidated statement of earnings in the first quarter of 2012. The $27.2 million gain was comprised of a $43.2 million gain on the sale of the RBC shares, the recognition of a $1.9 million gain previously recognized in other comprehensive earnings at December 31, 2011 and the write off of $17.9 million, the value of the collar at December 31, 2011. The $187.6 million of net proceeds received in 2012 were used to pay down debt.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-Glossary Equity Security
-URI http://asc.fasb.org/extlink&oid=6511694

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
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-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

Settlement Income

9 Months Ended

Sep. 30, 2012

Settlement Income

15.

Settlement Income

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 a 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 and satisfied in full a receivable recorded by the company. The company increased its reserve for future costs associated with the affected components on company products by $7.5 million during the second quarter of 2011 and also recorded a pretax gain of $11.2 million for the reimbursement of related costs incurred in prior years. This activity is included in the company’s 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 would 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. These provisions are also included in the company’s North America segment.

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2012

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Acquisition (Tables)

9 Months Ended

Sep. 30, 2012

Summary of Preliminary Estimate of Fair Value of the Assets Acquired and Liabilities Assumed


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


	(dollars in millions except per share data)
	Three Months Ended September 30, 2011		Nine Months Ended September 30, 2011
Net sales	$	441.1	$	1,358.1
Earnings from continuing operations		27.7		92.7
Earnings per common share:
Basic	$	0.60	$	2.01

Diluted	$	0.59	$	1.99

- 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

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Disposal Groups Including Discontinued Operations Income Statement

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


	(dollars in millions)
	Three Months Ended September 30,			Nine Months Ended September 30,
	2011			2011
Net sales	$	109.5		$	531.8
Cost of products sold		87.4			415.6

Gross profit		22.1			116.2
Selling, general and administrative expenses		16.8			61.5
Interest expense		0.4			2.2
Other income		(0.6	)		(6.0	)

		5.5			58.5
Provision for income taxes		0.4			14.9

Net earnings	$	5.1		$	43.6

Schedule of Disposal Groups Including Discontinued Operations Cash Flow Statement

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

Nine months ended September 30, 2011 (dollars in millions)


Operating Activities
Earnings	$	43.6
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5
Gain on sale of assets		(4.8	)
Net changes in operating assets and liabilities
Current assets and liabilities		(55.9	)
Noncurrent assets and liabilities		0.9
Other		(1.8	)

Cash Used in Discontinued Operating Activities		(1.5	)
Investing Activities
Capital expenditures		(10.6	)
Proceeds from sale of assets		6.1
Proceeds from sale of operations		752.5
Payments associated with sale		(20.2	)

Cash Provided by Discontinued Investing Activities		727.8

Cash Flow Provided by Discontinued Operations	$	726.3

Inventories (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Inventories

The following table presents the components of the company’s inventory balances:


	(dollars in millions)
	September 30, 2012			December 31, 2011
Finished products	$	85.7		$	85.6
Work in process		11.6			10.6
Raw materials		106.0			98.9

		203.3			195.1
LIFO reserve		(25.1	)		(26.7	)

	$	178.2		$	168.4

Product Warranties (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Product Warranty Liability Activity

The following table presents the company’s warranty liability activity.


	(dollars in millions)
	Nine Months Ended September 30,
	2012			2011
Balance at January 1	$	131.9		$	112.1
Lochinvar acquisition		—			5.8
Expense		42.7			49.6
Net increase in warranty reserve due to settlement		—			7.5
Claims settled		(42.0	)		(42.8	)

Balance at September 30	$	132.6		$	132.2

Earnings per Share of Common Stock (Tables)

9 Months Ended

Sep. 30, 2012

Schedule Of Computation Of Basic And Diluted Weighted-Average Shares Used In Earnings Per Share Calculations

The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Denominator for basic earnings per share - weighted average shares		46,193,952		46,221,603		46,190,965		46,137,918
Effect of dilutive stock options		375,140		420,920		352,883		472,871

Denominator for diluted earnings per share		46,569,092		46,642,523		46,543,848		46,610,789

Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Changes in Option Shares

Changes in option awards, all of which relate to Common Stock, were as follows for the nine months ended September 30, 2012:


	Weighted-Average Per Share Exercise Price		Nine Months Ended September 30, 2012			Average Remaining Contractual Life		Aggregate Intrinsic Value (dollars in millions)

Outstanding at January 1, 2012	$	24.84		1,421,867

Granted		45.97		191,000

Exercised		23.10		(482,308	)

Forfeited		42.89		(4,083	)


Outstanding at September 30, 2012		29.10		1,126,476			7 years	$	32.0


Exercisable at September 30, 2012		23.14		768,995			7 years	$	26.5

Schedule of Weighted-Average Fair Value Per Option at the Date of Grant


	Nine Months Ended September 30,
	2012			2011
Expected life (years)		6.2			6.4
Risk-free interest rate		2.0	%		3.6	%
Dividend yield		1.4	%		1.3	%
Expected volatility		39.4	%		38.4	%

Schedule of Share Unit Activity Under the Plan

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


	Number of Units			Weighted-Average Grant Date Value
Issued and unvested at January 1, 2012		286,554		$	27.36

Granted		83,900			45.97

Vested		(132,974	)		18.80

Forfeited		(3,004	)		37.42


Issued and unvested at September 30, 2012		234,476			38.74

Pensions (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Components of Net Pension Expense

The following table presents the components of the company’s net pension expense:


	(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Service cost	$	1.9		$	2.2		$	5.8		$	7.1
Interest cost		10.9			10.6			32.6			33.1
Expected return on plan assets		(17.2	)		(17.8	)		(51.6	)		(52.8	)
Amortization of unrecognized loss		8.1			6.6			24.1			17.8
Amortization of prior service cost		(0.2	)		(0.2	)		(0.6	)		(0.6	)

Ongoing expense		3.5			1.4			10.3			4.6
Curtailment/settlement credit		-			(0.6	)		-			(0.6	)

Defined benefit plan expense	$	3.5		$	0.8		$	10.3		$	4.0

Operations by Segment (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Operating Earnings

The company’s operations by segment are as follows:


	(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Net sales
North America	$	335.7		$	310.2		$	1,054.9		$	935.5
Rest of World		133.8			110.5			385.3			326.1
Inter-segment sales		(7.3	)		(8.7	)		(25.2	)		(26.9	)

	$	462.2		$	412.0		$	1,415.0		$	1,234.7

Operating earnings
North America^{(1), (2), (3)}	$	50.7		$	30.9		$	144.1		$	107.3
Rest of World		12.7			9.0			39.2			30.8

		63.4			39.9			183.3			138.1
Corporate (expense) income ⁽⁴⁾		(9.5	)		2.4			(3.7	)		(17.2	)
Interest expense		(1.9	)		(2.5	)		(7.1	)		(6.4	)

Earnings before income taxes		52.0			39.8			172.5			114.5
Provision for income taxes		15.0			12.9			53.1			34.8

Earnings from continuing operations	$	37.0		$	26.9		$	119.4		$	79.7

⁽¹⁾ Includes settlement income of	$	-		$	-		$	-		$	11.2
⁽²⁾ Includes Canadian warranty expense of		-			-			-			(8.2	)
⁽³⁾ Includes contingent consideration adjustment of		6.4			-			6.4			-
⁽⁴⁾ Includes net gain on investments of		-			16.4			27.2			20.1

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Assets Measured at Fair Value on a Recurring Basis

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


Fair Value Measurement Using	September 30, 2012		December 31, 2011
Quoted prices in active markets for identical assets (Level 1)	$	202.7	$	144.2
Significant other observable inputs (Level 2)		-		17.8

Total assets measured at fair value	$	202.7	$	162.0

- Definition

Tabular disclosure related to assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a recurring and/or nonrecurring basis in periods after initial recognition. Disclosures include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3) as well as transfers between levels 1 and 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a,b,bb)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2C
-URI http://asc.fasb.org/extlink&oid=7578670&loc=SL7498348-110258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-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 157
-Paragraph 33
-Subparagraph a, 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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 6
-Footnote 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

Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Effect of Derivative Instruments on the Statement of Earnings

The effect of derivatives designated as hedging instruments under ASC 815 on the Statement of Earnings for continuing and discontinued operations:

Three months ended September 30, (dollars in millions)


Derivatives in ASC 815 cash flow hedging relationships	Amount of gain/(loss) recognized in OCI on derivative (effective portion)						Location of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)					Location of gain/(loss) recognized in earnings on derivative (ineffective portion)	Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
	2012			2011				2012			2011			2012		2011
Commodities contracts	$	(0.1	)	$	(2.8	)	Cost of products sold	$	-		$	0.1	Cost of products sold	$	-	$	-
							Discontinued operations		-			1.0	Discontinued operations		-		-
							Gain on sale of EPC		-			1.8			-		-
Foreign currency contracts		(0.3	)		(0.1	)	Cost of products sold		(0.2	)		-	N/A		-		-
		-			-		Discontinued operations		-			2.0	Discontinued operations		-		-
		-			-		Gain on sale of EPC		-			5.2			-		-

	$	(0.4	)	$	(2.9	)		$	(0.2	)	$	10.1		$	-	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of gain/(loss) recognized in earnings from continuing operations on derivative		Amount of gain/(loss) recognized in earnings from continuing operations on derivative
				2012		2011
Equity collar contract		Other income	$	-	$	22.4

Three months ended September 30, (dollars in millions)


Derivatives in ASC 815 cash flow hedging relationships	Amount of gain/(loss) recognized in OCI on derivative (effective portion)						Location of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)					Location of gain/(loss) recognized in earnings on derivative (ineffective portion)	Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
	2012			2011				2012			2011			2012		2011
Commodities contracts	$	(0.1	)	$	(3.0	)	Cost of products sold	$	(0.1	)	$	-	Cost of products sold	$	-	$	0.1
							Discontinued operations		-			7.0	Discontinued operations		-		-
							Gain on sale of EPC		-			1.8			-		-
Foreign currency contracts		(0.4	)		4.9		Cost of products sold		(0.8	)		0.1	N/A		-		-
		-			-		Discontinued operations		-			6.9	Discontinued operations		-		-
							Gain on sale of EPC		-			5.2			-		-

	$	(0.5	)	$	(1.9	)		$	(0.9	)	$	21.0		$	-	$	0.1


Derivatives not designated as a hedging instrument under ASC 815	Location of gain/(loss) recognized in earnings from continuing operations on derivative			Amount of gain/(loss) recognized in earnings from continuing operations on derivative
					2012			2011
Equity collar contract		Other	(expense) income	$	(17.9	)	$	26.1

Designated as Hedging Instrument

Schedule of Summary by Currency of Foreign Currency Forward Contracts

The following table summarizes, by currency, the contractual amounts of the company’s foreign currency forward contracts for continuing operations:


September 30, (dollars in millions)	2012						2011
	Buy			Sell			Buy			Sell
British pound		$	-		$	2.2		$	-		$	-
Canadian dollar			-			39.2			-			40.4
Chinese renminbi			4.6			-			-			-
Euro			29.9			2.3			7.8			1.8
Mexican peso			11.6			-			14.4			-

Total		$	46.1		$	43.7		$	22.2		$	42.2

Schedule of Impact of Cash Flow Hedges on the Company's Financial Statements

The impact of derivative contracts on the company’s financial statements is as follows:

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


(dollars in millions)	Balance Sheet Location	September 30, 2012				December 31, 2011

Commodities contracts	Accrued liabilities		$	-			$	(0.1	)
Foreign currency contracts	Accrued liabilities			(0.9	)			(1.6	)
	Other current assets			1.0				1.3

Total derivatives designated as hedging instruments			$	0.1			$	(0.4	)

Not Designated as Hedging Instrument

Schedule of Impact of Cash Flow Hedges on the Company's Financial Statements

Fair value of derivative not designated as a hedging instrument under ASC 815 in continuing operations:

(dollars in millions)	Balance Sheet Location		September 30, 2012		December 31, 2011

Equity collar contract	Investments	$	-	$	17.9

Total derivatives not designated as hedging instruments		$	-	$	17.9

- 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

Acquisition - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Aug. 26, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Business Acquisition [Line Items]
Aggregate cash purchase price, net of cash acquired						$ 418.1
Pre-tax gain			$ 6.4		$ 6.4
Acquired intangible assets		$ 258.3
Business acquisition purchase price allocation goodwill and intangible assets deductible for income tax purposes		$ 369.7
Interest expense			1.9	$ 2.5	7.1	$ 6.4
Lochinvar Corporation
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
Contingent payment		35.0
Volume of sales required to make additional contingent payment		216.0
Estimated fair value of the contingent payment		16.8	10.4		10.4
Pre-tax gain			6.4
Acquired intangible assets		$ 258.3
Revenues from acquisitions included in operations	$ 20.8		63.4		167.5
Pre-tax earnings from acquisitions included in operations	2.0		$ 15.2		$ 35.7
Operating Earning	3.0
Acquisition Costs	4.4
Interest expense	$ 0.6
Customer Lists
Business Acquisition [Line Items]
Acquired intangible assets, amortization period in years		19 years
Customer Lists \| Lochinvar Corporation
Business Acquisition [Line Items]
Acquired intangible assets subject to amortization		$ 152.5
Non-Compete Agreements And Patents
Business Acquisition [Line Items]
Acquired intangible assets, amortization period in years		10 years
Non-Compete Agreements And Patents \| Lochinvar Corporation
Business Acquisition [Line Items]
Acquired intangible assets subject to amortization		$ 2.3
Trade Names \| Lochinvar Corporation
Business Acquisition [Line Items]
Acquired intangible assets that are not subject to amortization		$ 103.5

Summary of Preliminary Estimate of Fair Value of Assets Acquired and Liabilities Assumed (Detail) $ in Millions	Aug. 26, 2011 USD ($)
Acquisition [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

Schedule Of Pro Forma Unaudited Results Of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Acquisition [Abstract]
Net sales	$ 441.1	$ 1,358.1
Earnings from continuing operations	$ 27.7	$ 92.7
Earnings per common share, Basic	$ 0.60	$ 2.01
Earnings per common share, Diluted	$ 0.59	$ 1.99

- 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

Discontinued Operations - Additional Information (Detail) - USD ($) shares in Thousands, $ in Millions	1 Months Ended	9 Months Ended
	Aug. 22, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Discontinued Operations [Line Items]
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
EPC
Discontinued Operations [Line Items]
Proceeds from sale of business segment	$ 759.9
Proceeds from sale of business segment, shares	2,830
Working capital adjustment	$ 7.4
Value of shares from sale of business segment	$ 140.6
Income taxes paid		$ 31.1
Other sale related expenses		3.3
Income taxes payable		2.5
Additional income tax accrual		$ 56.5

Schedule of Disposal Groups Including Discontinued Operations Income Statement (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Discontinued Operations [Abstract]
Net sales	$ 109.5	$ 531.8
Cost of products sold	87.4	415.6
Gross profit	22.1	116.2
Selling, general and administrative expenses	16.8	61.5
Interest expense	0.4	2.2
Other income	(0.6)	(6.0)
Earnings before income taxes	5.5	58.5
Provision for income taxes	0.4	14.9
Net earnings	$ 5.1	$ 43.6

Schedule of Disposal Groups Including Discontinued Operations Cash Flow Statement (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Discontinued Operations
Earnings	$ 5.1		$ 43.6
Depreciation and amortization			16.5
Gain on sale of assets			(4.8)
Current assets and liabilities			(55.9)
Noncurrent assets and liabilities			0.9
Other			(1.8)
Cash Used in Discontinued Operating Activities		$ (27.0)	(1.5)
Capital expenditures			(10.6)
Proceeds from sale of assets			6.1
Proceeds from sale of operations			752.5
Payments associated with sale			(20.2)
Cash Provided by Discontinued Investing Activities			727.8
Cash Flow Provided by Discontinued Operations			$ 726.3

Schedule of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2012	Dec. 31, 2011
Inventories [Abstract]
Finished products	$ 85.7	$ 85.6
Work in process	11.6	10.6
Raw materials	106.0	98.9
Inventories, at FIFO cost	203.3	195.1
LIFO reserve	(25.1)	(26.7)
Inventories, Net	$ 178.2	$ 168.4

Long-Term Debt - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2012 USD ($)
Line of Credit Facility [Line Items]
Multi-currency revolving credit agreement	$ 425
Number of banks involved in multi-year multi-currency revolving credit agreement	8
Revolving credit facility, expiration date	Nov. 13, 2013
Multi-currency revolving credit agreement, maximum amount	$ 525

Company's Warranty Liability Activity (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	May 05, 2011	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Product Warranties [Abstract]
Balance at January 1			$ 131.9	$ 112.1
Expense			42.7	49.6
Net increase in warranty reserve due to settlement	$ 7.5	$ 8.2		7.5
Claims settled			(42.0)	(42.8)
Balance at September 30			$ 132.6	132.2
Lochinvar Corporation
Product Warranties [Abstract]
Lochinvar acquisition				$ 5.8

Schedule of Computation of Basic and Diluted Weighted-Average Shares Used in Earnings Per Share Calculations (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share Of Common Stock [Abstract]
Denominator for basic earnings per share - weighted average shares	46,193,952	46,221,603	46,190,965	46,137,918
Effect of dilutive stock options	375,140	420,920	352,883	472,871
Denominator for diluted earnings per share	46,569,092	46,642,523	46,543,848	46,610,789

- 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 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 2: 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=7655603&loc=d3e1448-109256

Reference 3: 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 4: 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.

Reference 5: 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 6: 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 7: 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.

+ Details

Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Based Compensation [Line Items]
Total stock based compensation cost recognized	$ 1.5	$ 1.1	$ 5.3	$ 4.6
Stock based compensation cost attributable to stock options	$ 0.7	0.5	$ 2.5	$ 2.3
Weighted-average fair value per option at the date of grant			$ 16.52	$ 16.51
A.O. Smith Combined Compensation Plan
Stock Based Compensation [Line Items]
Number of shares available for granting of options, restricted stock or share units	1,633,604		1,633,604
Restricted Stock And Share Units
Stock Based Compensation [Line Items]
Award vesting period			3 years	3 years
Share units granted under the plan			83,900	75,625
Value of share units at the date of issuance			$ 3.9	$ 3.3
Share based compensation expense attributable to share units	$ 0.8	$ 0.6	$ 2.8	$ 2.3
Stock Option
Stock Based Compensation [Line Items]
Award vesting period			3 years	3 years
Award expiration period			10 years	10 years

Changes in Option Awards, All of Which Relate to Common Stock (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2012 USD ($) $ / shares shares
Stock Based Compensation [Abstract]
Weighted- Avg. Per Share Exercise Price, Outstanding at Beginning of Period \| $ / shares	$ 24.84
Weighted- Avg. Per Share Exercise Price - Granted \| $ / shares	45.97
Weighted- Avg. Per Share Exercise Price - Exercised \| $ / shares	23.10
Weighted- Avg. Per Share Exercise Price - Forfeited \| $ / shares	42.89
Weighted- Avg. Per Share Exercise Price, Outstanding at End of Period \| $ / shares	29.10
Weighted- Avg. Per Share Exercise Price, Exercisable \| $ / shares	$ 23.14
Outstanding, Beginning Balance \| shares	1,421,867
Granted \| shares	191,000
Exercised \| shares	(482,308)
Forfeited \| shares	(4,083)
Outstanding, Ending Balance \| shares	1,126,476
Exercisable at End of Period \| shares	768,995
Average Remaining Contractual Life, Outstanding at End of Period, Years	7 years
Average Remaining Contractual Life, Exercisable at End of Period, Years	7 years
Aggregate Intrinsic Value, Outstanding at End of Period \| $	$ 32.0
Aggregate Intrinsic Value, Exercisable at End of Period \| $	$ 26.5

Schedule of Weighted-Average Fair Value per Option at Date of Grant (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Stock Based Compensation [Abstract]
Expected life (years)	6 years 2 months 12 days	6 years 4 months 24 days
Risk-free interest rate	2.00%	3.60%
Dividend yield	1.40%	1.30%
Expected volatility	39.40%	38.40%

Summary of Share Unit Activity Under Plan (Detail) - Restricted Stock And Share Units - $ / shares	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Stock Based Compensation [Line Items]
Number of Units Issued and unvested, Beginning of Period	286,554
Number of Units - Granted	83,900	75,625
Number of Units - Vested	(132,974)
Number of Units - Forfeited	(3,004)
Number of Units Issued and unvested, End of Period	234,476
Weighted-Average Grant Date Value, Beginning of Period	$ 27.36
Weighted-Average Grant Date Value - Granted	45.97
Weighted-Average Grant Date Value - Vested	18.80
Weighted-Average Grant Date Value - Forfeited	37.42
Weighted-Average Grant Date Value, End of Period	$ 38.74

Components of Company's Net Pension Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pensions [Abstract]
Service cost	$ 1.9	$ 2.2	$ 5.8	$ 7.1
Interest cost	10.9	10.6	32.6	33.1
Expected return on plan assets	(17.2)	(17.8)	(51.6)	(52.8)
Amortization of unrecognized loss	8.1	6.6	24.1	17.8
Amortization of prior service cost	(0.2)	(0.2)	(0.6)	(0.6)
Ongoing expense	3.5	1.4	10.3	4.6
Curtailment/settlement credit		(0.6)		(0.6)
Defined benefit plan expense	$ 3.5	$ 0.8	$ 10.3	$ 4.0

- Definition

The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Curtailment
-URI http://asc.fasb.org/extlink&oid=6520938

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 15
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

Reference 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 88
-Paragraph 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 7: 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.

+ Details

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: 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 5: 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 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.

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, 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 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.

+ Details

Pensions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items]
Contributions made by company		$ 175.0
Defined benefit plan expense associated with discontinued operations	$ 0.6	$ 1.6

Operations by Segment - Additional Information (Detail)	9 Months Ended
Operations by Segment - Additional Information (Detail)	Sep. 30, 2012 Segment
Segment Reporting Information [Line Items]
Number of reporting segments	2

Schedule of Operating Earnings (Detail) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2012

Sep. 30, 2011

Segment Reporting Information [Line Items]

Net sales

$ 462.2

$ 412.0

$ 1,415.0

$ 1,234.7

Operating earnings

63.4

39.9

183.3

138.1

Corporate (expense) income

^[1]

(9.5)

2.4

(3.7)

(17.2)

Interest expense

(1.9)

(2.5)

(7.1)

(6.4)

Earnings before income taxes

52.0

39.8

172.5

114.5

Provision for income taxes

15.0

12.9

53.1

34.8

Earnings from continuing operations

37.0

26.9

119.4

79.7

North America

Segment Reporting Information [Line Items]

Net sales

335.7

310.2

1,054.9

935.5

Operating earnings

^[2],[3],[4]

50.7

30.9

144.1

107.3

Rest of World

Segment Reporting Information [Line Items]

Net sales

133.8

110.5

385.3

326.1

Operating earnings

12.7

9.0

39.2

30.8

Inter-Segment Sales

Segment Reporting Information [Line Items]

Net sales

$ (7.3)

$ (8.7)

$ (25.2)

$ (26.9)

[1]	Includes net gain on investments of - 16.4 27.2 20.1
[2]	Includes Canadian warranty expense of - - - (8.2 )
[3]	Includes contingent consideration adjustment of 6.4 - 6.4 -
[4]	Includes settlement income of $ - $ - $ - $ 11.2

Schedule of Operating Earnings (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Settlement income			$ 11.2		$ 11.2
Warranty expense				$ (42.7)	(49.6)
Contingent consideration adjustment	$ 6.4			6.4
Gain on investments		$ 16.4		$ 27.2	20.1
CANADA
Segment Reporting Information [Line Items]
Warranty expense					$ (8.2)

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: 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),9(a))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 5

+ Details

Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 202.7	$ 162.0
Quoted Prices In Active Markets For Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 202.7	144.2
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		$ 17.8

Derivative Instruments - Additional Information (Detail) shares in Thousands, lb in Millions, $ in Millions	8 Months Ended	9 Months Ended
	Aug. 22, 2011 USD ($) shares	Sep. 30, 2012 $ / Derivative lb
Trading Activity, Gains and Losses, Net [Line Items]
Commodity hedges outstanding, total weight of copper, in pounds \| lb		0.2
Share payments for proceeds from sale of business segment \| shares	2,830
Equity collar contract, percentage of shares hedged	50.00%
Put Option
Trading Activity, Gains and Losses, Net [Line Items]
Price of the equity collar, per share		63.29
Call Option
Trading Activity, Gains and Losses, Net [Line Items]
Price of the equity collar, per share		77.32
Foreign Currency Forward Contracts
Trading Activity, Gains and Losses, Net [Line Items]
Change in foreign currency valuation from discontinued operations \| $	$ 3.2

Summary by Currency, Contractual Amounts of Company's Foreign Currency Forward Contracts for Continuing Operations (Detail) - USD ($) $ in Millions	Sep. 30, 2012	Sep. 30, 2011
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 46.1	$ 22.2
Sell	43.7	42.2
Euro
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	29.9	7.8
Sell	2.3	1.8
Canadian Dollar
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Sell	39.2	40.4
Mexican Peso
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	11.6	$ 14.4
Chinese Renminibi
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	4.6
British Pound
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Sell	$ 2.2

Impact of Derivative Contracts on Company's Financial Statements (Detail) - USD ($) $ in Millions	Sep. 30, 2012	Dec. 31, 2011
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ 0.1	$ (0.4)
Designated as Hedging Instrument \| Commodities Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities		(0.1)
Designated as Hedging Instrument \| Foreign Currency Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(0.9)	(1.6)
Designated as Hedging Instrument \| Foreign Currency Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	$ 1.0	1.3
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total		17.9
Not Designated as Hedging Instrument \| Equity Collar Contract \| Investments
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets		$ 17.9

Effect of Derivative Instruments on Statement of Earnings for Continuing and Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	$ (0.4)	$ (2.9)	$ (0.5)	$ (1.9)
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	(0.2)	10.1	(0.9)	21.0
Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)				0.1
Commodities Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	(0.1)	(2.8)	(0.1)	(3.0)
Commodities Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)		0.1	(0.1)
Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)				0.1
Commodities Contracts \| Discontinued Operations
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)		1.0		7.0
Commodities Contracts \| Gain On Sale of EPC
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)		1.8		1.8
Foreign Currency Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	(0.3)	(0.1)	(0.4)	4.9
Foreign Currency Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	$ (0.2)		(0.8)	0.1
Foreign Currency Contracts \| Discontinued Operations
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)		2.0		6.9
Foreign Currency Contracts \| Gain On Sale of EPC
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)		5.2		5.2
Equity Collar Contract \| Not Designated as Hedging Instrument \| Other Income
Derivative [Line Items]
Amount of loss recognized in earnings from continuing operations on derivative		$ 22.4	$ (17.9)	$ 26.1

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Effective tax rate		28.80%	30.80%	31.10%
Unrecognized tax benefits		$ 1.5	$ 1.5
Unrecognized tax benefits that would affect the effective tax rate if recognized		$ 1.0	$ 1.0
U.S. federal \| Minimum
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2008
U.S. federal \| Maximum
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2011
State and local \| Minimum
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2000
State and local \| Maximum
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2011
Non-U.S. \| Minimum
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2005
Non-U.S. \| Maximum
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2011
Scenario, Forecast
Income Tax Contingency [Line Items]
Effective tax rate	30.00%

Investment in RBC Shares - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Schedule of Investments [Line Items]
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		$ (3.7)	$ (1.2)	$ (3.7)	1.2
Unrealized before-tax gain on available for sale securities			1.9
Net proceeds from the sale of company shares	$ 187.6
RBC share price per share	$ 66.19
Pre-tax gain on sale of investments			27.2	$ 20.1
Net proceeds from sale of securities			227.8
Gain on sale of RBC shares			$ 43.2
Reclassification adjustment					$ 17.9

Settlement Income - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	May 05, 2011	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Component of Other Income, Nonoperating [Line Items]
Proceeds from legal settlement	$ 35.5
Increase in reserve for future costs	$ 7.5	$ 8.2		$ 7.5
Gain for reimbursement of related cost		$ 11.2		$ 11.2
Lawsuit date			Jun. 14, 2011