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Basis of Presentation - Additional Information (Detail) - Subsequent Event	1 Months Ended	3 Months Ended
	Apr. 15, 2013	Mar. 31, 2013
Organization And Summary Of Significant Accounting Policies [Line Items]
Stock split ratio	2
Percentage of stock dividend to stock holders		100.00%
Dividend payable date		May 15, 2013
Dividend date of record		Apr. 30, 2013

Condensed Consolidated Statements Of Earnings - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 509.6	$ 468.6
Cost of products sold	330.3	319.5
Gross profit	179.3	149.1
Selling, general and administrative expenses	120.0	105.3
Restructuring, impairment and settlement expense-net	1.7
Interest expense	1.5	3.0
Other income	(1.0)	(29.1)
Earnings before provision for income taxes	57.1	69.9
Provision for income taxes	18.1	22.4
Net Earnings	$ 39.0	$ 47.5
Net Earnings Per Share of Common Stock	$ 0.42	$ 0.52
Diluted Net Earnings Per Share of Common Stock	0.42	0.51
Dividends Per Share of Common Stock	$ 0.10	$ 0.08

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 306.9	$ 266.9
Marketable securities	144.5	196.0
Receivables	423.7	425.4
Inventories	169.8	163.4
Deferred income taxes	32.6	33.2
Other current assets	28.3	22.3
Total Current Assets	1,105.8	1,107.2
Property, plant and equipment	690.5	680.7
Less accumulated depreciation	344.5	335.0
Net property, plant and equipment	346.0	345.7
Goodwill	436.0	435.4
Other intangibles	337.2	338.7
Other assets	42.1	38.2
Total Assets	2,267.1	2,265.2
Liabilities
Trade payables	306.0	328.9
Accrued payroll and benefits	40.0	46.5
Income taxes	13.4	0.2
Accrued liabilities	51.3	57.0
Product warranties	43.2	43.2
Long-term debt due within one year	18.6	18.6
Current liabilities-discontinued operations	4.6	4.6
Total Current Liabilities	477.1	499.0
Long-term debt	210.5	225.1
Pension liabilities	186.6	190.1
Other liabilities	149.4	148.3
Long-term liabilities-discontinued operations	7.8	8.6
Total Liabilities	1,031.4	1,071.1
Stockholders' Equity
Class A Common Stock, $5 par value: authorized 14,000,000 shares; issued 13,304,280 and 13,309,876	66.6	66.6
Common Stock, $1 par value: authorized 120,000,000 shares; issued 82,033,936 and 82,049,542	82.0	82.0
Capital in excess of par value	583.1	580.5
Retained earnings	884.9	855.1
Accumulated other comprehensive loss	(315.0)	(320.5)
Treasury stock at cost	(65.9)	(69.6)
Total Stockholders' Equity	1,235.7	1,194.1
Total Liabilities and Stockholders' Equity	$ 2,267.1	$ 2,265.2

Schedule of Operating Earnings (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Settlement income	$ 11.0
Restructuring and impairment expense	1.7
Gain on shares of stock		$ 27.2
Operating Income
Segment Reporting Information [Line Items]
Non-operating pension costs	(3.6)	(1.0)
Segment Reporting
Segment Reporting Information [Line Items]
Restructuring and impairment expense	(12.7)
Corporate Expense
Segment Reporting Information [Line Items]
Non-operating pension costs	$ (1.2)	$ (0.6)

- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
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-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 22
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 5

+ Details

Basis of Presentation

3 Months Ended

Mar. 31, 2013

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 month period ended March 31, 2013 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, 2013.

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

On April 15, 2013, the company’s stockholders approved a proposal to increase the company’s authorized shares of Common Stock and the company’s board of directors declared a two-for-one stock split of the company’s Class A Common Stock and Common Stock (including treasury shares) in the form of a one hundred percent stock dividend to stockholders of record on April 30, 2013 and payable on May 15, 2013. All references in the financial statements and footnotes to the number of shares outstanding, price per share, per share amounts and stock based compensation data have been recast to reflect the split for all periods presented.

Certain other prior year amounts have been reclassified to conform to the 2013 presentation.

Recent Accounting Pronouncements

In July 2012, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (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 is effective for the year ending December 31, 2013. The adoption of this ASU will not have an impact on the company’s consolidated financial condition, results of operations or cash flows.

In February 2013, the FASB issued ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” ASU No. 2013-02 sets requirements for presentation for significant items reclassified out of accumulated other comprehensive income to net income in reporting periods presented. ASU 2013-02 is effective prospectively beginning with the quarter ended March 31, 2013. The adoption of this guidance did not have an impact on the company’s financial condition or results of operations but required additional disclosure in the notes to the company’s financial statements. The company has complied with the disclosure requirements of ASU 2013-02 for the period ended March 31, 2013.

- Definition

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

+ References

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-Name Statement of Position (SOP)
-Number 94-6
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-Name Accounting Research Bulletin (ARB)
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+ Details

Components of Company's Net Pension Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pensions [Abstract]
Service cost	$ 2.3	$ 2.0
Interest cost	9.8	10.8
Expected return on plan assets	(15.4)	(17.3)
Amortization of unrecognized loss	10.4	8.0
Amortization of prior service cost	(0.2)	(0.2)
Defined benefit plan expense	$ 6.9	$ 3.3

- 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

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-Name Accounting Standards Codification
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-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=6512136

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-Name Statement of Financial Accounting Standard (FAS)
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+ 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

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+ Details

Stock Based Compensation

3 Months Ended

Mar. 31, 2013

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 is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by stockholders in 2002. At the company’s annual meeting of stockholders on April 16, 2012 the plan was reauthorized by stockholders and the number of shares available for granting of options or share units at March 31, 2013 was 2,785,974. All share references in this note give effect to a two-for-one stock split payable on May 15, 2013. Upon stock option exercise or share unit vesting, shares are issued from treasury stock.

Total stock based compensation cost recognized in the three month periods ended March 31, 2013 and 2012 was $4.0 million and $2.4 million, respectively.

Stock Options

The stock options granted in the three month periods ended March 31, 2013 and 2012, 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 2013 and 2012 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 month periods ended March 31, 2013 and 2012 was $1.8 million and $1.1 million, respectively. Included in the stock option expense for the three month periods ended March 31, 2013 and 2012 is expense associated with the accelerated vesting of stock option awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

Changes in option awards, all of which relate to Common Stock, were as follows for the three months ended March 31, 2013:


	Weighted-Avg. Per Share Exercise Price		Three Months Ended March 31, 2013			Average Remaining Contractual Life		Aggregate Intrinsic Value (dollars in millions)

Outstanding at January 1, 2013	$	16.72		1,530,734

Granted		34.96		352,200

Exercised		13.37		(221,740	)

Forfeited		30.66		(1,866	)


Outstanding at March 31, 2013		21.01		1,659,328			8 years	$	26.2


Exercisable at March 31, 2013	$	15.34		957,222			7 years	$	20.5

The weighted-average fair value per option at the date of grant during the three months ended March 31, 2013 and 2012 using the Black-Scholes option-pricing model was $12.45 and $8.26, respectively. Assumptions were as follows:


	Three Months Ended March 31,
	2013			2012
Expected life (years)		6.1			6.2
Risk-free interest rate		2.0	%		2.0	%
Dividend yield		1.1	%		1.4	%
Expected volatility		38.4	%		39.4	%

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 expected dividend yield is based on the expected annual dividends divided by the grant date market value of our common stock. The expected volatility is based on the historical volatility of our common stock.

Restricted Stock and Share Units

Participants may also be awarded shares of restricted stock or share units under the plan. The company granted 141,200 and 167,600 share units under the plan in the three month periods ended March 31, 2013 and 2012, respectively. The share units were valued at $4.9 million and $3.9 million at the date of issuance in 2013 and 2012, 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 $2.2 million and $1.3 million was recognized in the three month periods ended March 31, 2013 and 2012, respectively. Share based compensation expense recognized in the three month periods ended March 31, 2013 and 2012 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 for the three months ended March 31, 2013:


	Number of Units			Weighted-Average Grant Date Value

Issued and unvested at January 1, 2013		469,012		$	19.37

Granted		141,200			34.58

Vested		(157,732	)		13.97

Forfeited/cancelled		(8,550	)		27.23


Issued and unvested at March 31, 2013		443,930		$	25.98

- 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

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-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

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-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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-Publisher AICPA
-Name Statement of Position (SOP)
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+ Details

Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 146.7	$ 197.2
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	146.8	$ 197.2
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ (0.1)

Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2013

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Stock Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 15, 2013	Mar. 31, 2013 USD ($) $ / shares shares	Mar. 31, 2012 USD ($) $ / shares shares
Stock Based Compensation [Line Items]
Total stock based compensation cost recognized		$ 4.0	$ 2.4
Stock option compensation recognized		$ 1.8	$ 1.1
Weighted-average fair value per option at the date of grant \| $ / shares		$ 12.45	$ 8.26
Subsequent Event
Stock Based Compensation [Line Items]
Stock split ratio	2
Dividend payable date		May 15, 2013
Stock Option
Stock Based Compensation [Line Items]
Award vesting period		3 years	3 years
Award expiration period		10 years	10 years
Restricted Stock And Share Units
Stock Based Compensation [Line Items]
Award vesting period		3 years	3 years
Share units granted under the plan \| shares		141,200	167,600
Value of share units at the date of issuance		$ 4.9	$ 3.9
Share based compensation expense attributable to share units		$ 2.2	$ 1.3
A.O. Smith Combined Compensation Plan
Stock Based Compensation [Line Items]
Number of shares available for granting of options, restricted stock or share units \| shares		2,785,974

Subsequent Events

3 Months Ended

Mar. 31, 2013

Subsequent Events

16.

Subsequent Events

On April 15, 2013, the company’s stockholders approved a proposal to increase the company’s authorized shares of Common Stock and the company’s board of directors declared a two-for-one stock split of the company’s Class A Common Stock and Common Stock (including treasury shares) in the form of a one hundred percent stock dividend to stockholders of record on April 30, 2013 and payable on May 15, 2013. All references in the financial statements and footnotes to number of shares outstanding, price per share, per share amounts and stock based compensation data have been recast to reflect the split for all periods presented.

Operations by Segment - Additional Information (Detail)	3 Months Ended
Operations by Segment - Additional Information (Detail)	Mar. 31, 2013 Segment
Segment Reporting Information [Line Items]
Number of reporting segments	2

Summary by Currency, Contractual Amounts of Company's Foreign Currency Forward Contracts for Continuing Operations (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Mar. 31, 2012
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 33.8	$ 31.8
Sell	30.7	28.3
British Pound
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Sell	1.7
Canadian Dollar
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Sell	27.5	27.4
Chinese Renminibi
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy		5.7
Euro
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	17.2	12.2
Sell	1.5	0.9
Mexican Peso
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 16.6	$ 13.9

Impact of Derivative Contracts on Company's Financial Statements (Detail) - Designated as Hedging Instrument - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ 2.3	$ 1.2
Foreign Currency Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	2.4	1.7
Foreign Currency Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	$ (0.1)	$ (0.5)

Schedule of Weighted-Average Fair Value per Option at Date of Grant (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Based Compensation [Abstract]
Expected life (years)	6 years 1 month 6 days	6 years 2 months 12 days
Risk-free interest rate	2.00%	2.00%
Dividend yield	1.10%	1.40%
Expected volatility	38.40%	39.40%

Subsequent Events - Additional Information (Detail) - Subsequent Event	1 Months Ended	3 Months Ended
	Apr. 15, 2013	Mar. 31, 2013
Subsequent Event [Line Items]
Stock split ratio	2
Percentage of stock dividend to stock holders		100.00%
Dividend payable date		May 15, 2013
Dividend date of record		Apr. 30, 2013

Fair Value Measurements

3 Months Ended

Mar. 31, 2013

Fair Value Measurements

11.

Fair Value Measurements

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

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

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


Fair Value Measurement Using	March 31, 2013			December 31, 2012
Quoted prices in active markets for identical assets (Level 1)	$	146.8		$	197.2
Significant other observable inputs (Level 2)		(0.1	)		-

Total assets measured at fair value	$	146.7		$	197.2

There were no changes in our valuation techniques used to measure fair values on a recurring basis during the three months ended March 31, 2013.

- 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
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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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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+ Details

Summary of Share Unit Activity Under Plan (Detail) - Restricted Stock And Share Units - $ / shares	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Based Compensation [Line Items]
Number of Units Issued and unvested, Beginning of Period	469,012
Number of Units - Granted	141,200	167,600
Number of Units - Vested	(157,732)
Number of Units - Forfeited/cancelled	(8,550)
Number of Units Issued and unvested, End of Period	443,930
Weighted-Average Grant Date Value, Beginning of Period	$ 19.37
Weighted-Average Grant Date Value - Granted	34.58
Weighted-Average Grant Date Value - Vested	13.97
Weighted-Average Grant Date Value - Forfeited/cancelled	27.23
Weighted-Average Grant Date Value, End of Period	$ 25.98

Product Warranties

3 Months Ended

Mar. 31, 2013

Product Warranties

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)
	Three Months Ended March 31,
	2013			2012
Balance at January 1	$	129.6		$	131.9
Expense		15.0			15.4
Claims settled		(15.7	)		(15.3	)

Balance at March 31	$	128.9		$	132.0

Investment in RBC Shares

3 Months Ended

Mar. 31, 2013

Investment in RBC Shares

14.

Investment in RBC Shares

The company received approximately 2.83 million shares of RBC common stock as a part of the proceeds of its sale of EPC to RBC. One half of the 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 loss as of December 31, 2011. The company entered into an equity collar contract for the remaining half of the RBC shares that were classified as trading securities. Those shares were also recorded at fair value. See Note 12 for further discussion regarding the collar. During the first three months 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. The $27.2 million is comprised of a $43.2 million gain on the sale of the RBC shares, the recognition of a $1.9 million gain recognized in other comprehensive earnings at December 31, 2011 as partially offset by the write off of $17.9 million, the value of the collar at December 31, 2011. The $122.9 million of proceeds received during the first three months of 2012 were used to pay down debt. The remaining proceeds of $64.7 million were recorded as a receivable as of March 31, 2012.

- 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

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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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

Earnings per Share of Common Stock

3 Months Ended

Mar. 31, 2013

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 March 31,
	2013		2012
Denominator for basic earnings per share - weighted average shares		92,551,062		92,206,386
Effect of dilutive stock options		633,828		770,286

Denominator for diluted earnings per share		93,184,890		92,976,672

Basic and diluted weighted-average shares give effect to a two-for-one stock split payable on May 15, 2013.

Derivative Instruments - Additional Information (Detail) shares in Thousands, lb in Millions	1 Months Ended	3 Months Ended
	Aug. 22, 2011 shares	Mar. 31, 2013 $ / Derivative lb
Trading Activity, Gains and Losses, Net [Line Items]
Proceeds from sale of segment, shares \| shares	2,830
Equity collar contract, percentage of shares hedged	50.00%
Commodity hedges outstanding, total weight of copper, in pounds \| lb		0.4
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

Schedule of Inventories (Detail) - USD ($) $ in Millions	Mar. 31, 2013	Dec. 31, 2012
Inventories [Abstract]
Finished products	$ 78.6	$ 74.4
Work in process	13.0	12.0
Raw materials	101.2	100.0
Inventories, at FIFO cost	192.8	186.4
LIFO reserve	(23.0)	(23.0)
Inventories, Net	$ 169.8	$ 163.4

Changes in Accumulated Other Comprehensive Loss by Component (Tables)

3 Months Ended

Mar. 31, 2013

Changes to Accumulated Other Comprehensive Loss by Component

Changes to accumulated other comprehensive loss by component for the three months ended March 31, 2013 are as follows:


	(dollars in millions)
	Cumulative Foreign Currency Translation			Unrealized Net Gain (Loss) on Cash Flow Derivatives			Pension Liability			Total
Balance at December 31, 2012	$	19.5		$	0.7		$	(340.7	)	$	(320.5	)
Other comprehensive (loss) earnings before reclassifications		(1.5	)		1.1			-			(0.4	)
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		-			(0.4	)		6.3			5.9

Balance at March 31, 2013	$	18.0		$	1.4		$	(334.4	)	$	(315.0	)

⁽¹⁾ Amounts reclassified from accumulated other comprehensive loss:
Realized losses on derivatives reclassified to cost of products sold		(0.6	)
Tax benefit		0.2

Reclassification net of tax	$	(0.4	)

Amortization of pension items:
Actuarial losses	$	10.4	⁽²⁾
Prior year service cost		(0.2	)⁽²⁾

		10.2
Tax benefit		(3.9	)

Reclassification net of tax	$	6.3

⁽²⁾

These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 9 - Pensions for additional details.

Company's Warranty Liability Activity (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Product Warranties [Abstract]
Balance at January 1	$ 129.6	$ 131.9
Expense	15.0	15.4
Claims settled	(15.7)	(15.3)
Balance at March 31	$ 128.9	$ 132.0

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 30, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
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 Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,619,395
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		39,741,893

Operations by Segment (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Operating Earnings


	(dollars in millions)
	Three Months Ended March 31,
	2013			2012
Net sales
North America	$	378.7		$	353.3
Rest of World		138.3			124.2
Inter-segment sales		(7.4	)		(8.9	)

	$	509.6		$	468.6

Operating earnings
North America ^(1) (3) (4)	$	54.1		$	42.2
Rest of World		18.2			14.2

		72.3			56.4

Corporate (expense) income ^(2) (5)		(13.7	)		16.5
Interest expense		(1.5	)		(3.0	)

Earnings before income taxes		57.1			69.9
Provision for income taxes		18.1			22.4

Earnings from continuing operations	$	39.0		$	47.5

⁽¹⁾ Includes non-operating pension costs of:	$	(3.6	)	$	(1.0	)
⁽²⁾ Includes non-operating pension costs of:	$	(1.2	)	$	(0.6	)
⁽³⁾ Includes settlement income of:	$	11.0		$	-
⁽⁴⁾ Includes restructuring and impairment expense of:	$	(12.7	)	$	-
⁽⁵⁾ Includes net gain on shares of stock of:	$	-		$	27.2

- Definition

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

+ References + Details

Income Taxes

3 Months Ended

Mar. 31, 2013

Income Taxes

13.

Income Taxes

The effective tax rate for the three months ended March 31, 2013 was 31.7 percent compared to 32.0 percent for the first three months of 2012. The company estimates that its annual effective tax rate for the full year of 2013 will be between 30.0 and 30.5 percent. The full year effective tax rate in 2012 was 30.4 percent including the company’s settlement with a former supplier in 2012.

As of March 31, 2013, the company had $1.3 million of unrecognized tax benefits from continuing operations of which $0.9 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 - 2012 are subject to audit. The company is subject to state and local audits for tax years 2000 - 2012. The company is also subject to non-U.S. income tax examinations for years 2005 - 2012.

- 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
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-Name Accounting Standards Codification
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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 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: 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.

+ Details

Condensed Consolidated Statements Of Comprehensive Earnings - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net earnings	$ 39.0	$ 47.5
Other comprehensive (loss) earnings
Foreign currency translation adjustments	(1.5)	2.8
Unrealized net gain on cash flow derivative instruments, less related income tax provision of $(0.4) in 2013 and $(0.4) in 2012	0.7	0.6
Adjustment to additional minimum pension liability, less related income tax provision of $(3.9) in 2013	6.3
Reversal of unrealized gain on investments less related tax benefit of $0.7 in 2012		(1.2)
Comprehensive Earnings	$ 44.5	$ 49.7

- 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

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-Name Statement of Financial Accounting Standard (FAS)
-Number 130
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-Publisher FASB
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-Number 130
-Paragraph 121
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
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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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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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

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net earnings	$ 39.0	$ 47.5
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:
Depreciation and amortization	14.1	13.4
Pension expense	6.9	3.3
Loss on disposal of assets		0.1
Gain on sale of investments		(27.2)
Net changes in operating assets and liabilities, net of acquisitions:
Current assets and liabilities	(28.0)	(21.5)
Noncurrent assets and liabilities	4.6	(0.5)
Cash Provided by Operating Activities-continuing operations	36.6	15.1
Cash Used in Operating Activities-discontinued operations	(0.8)	(18.6)
Cash Provided by (Used in) Operating Activities	35.8	(3.5)
Investing Activities
Capital expenditures	(18.4)	(13.1)
Acquisitions	(6.1)
Investment in marketable securities	(31.7)	(60.9)
Net proceeds from sale of securities	83.0	122.9
Cash Provided by Investing Activities	26.8	48.9
Financing Activities
Long-term debt retired	(15.5)	(143.1)
Common stock repurchases	(3.5)
Net proceeds from stock option activity	5.8	8.8
Dividends paid	(9.4)	(7.3)
Cash Used in Financing Activities	(22.6)	(141.6)
Net increase (decrease) in cash and cash equivalents	40.0	(96.2)
Cash and cash equivalents-beginning of period	266.9	463.4
Cash and Cash Equivalents-End of Period	$ 306.9	$ 367.2

Schedule of Analysis of Company's Restructuring, Impairment and Settlement Reserve (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Expense (income) recognized	$ 1.7
Asset write-down	(7.5)
Settlement income	11.0
Ending Balance	5.2
Severance Costs
Restructuring Cost and Reserve [Line Items]
Expense (income) recognized	5.2
Ending Balance	5.2
Asset Impairment
Restructuring Cost and Reserve [Line Items]
Expense (income) recognized	7.5
Asset write-down	(7.5)
Settlement Income
Restructuring Cost and Reserve [Line Items]
Expense (income) recognized	(11.0)
Settlement income	$ 11.0

Restructuring, Impairment and Settlement Expense-Net (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Analysis of Company's Restructuring, Impairment and Settlement Reserve

The following table presents an analysis of the company’s restructuring, impairment and settlement reserve as of and for three months ended March 31, 2013 (dollars in millions):


	Severance Costs		Asset Impairment				Settlement Income			Total
Balance at December 31, 2012	$	-		$	-		$	-		$	-
Expense (income) recognized		5.2			7.5			(11.0	)		1.7
Asset write-down		-			(7.5	)		-			(7.5	)
Settlement income		-			-			11.0			11.0

Balance at March 31, 2013	$	5.2		$	-		$	-		$	5.2

Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Effect of Derivative Instruments on Statement of Earnings

The effect of derivatives designated as hedging instruments under ASC 815 on the Statement of Earnings:

Three Months Ended March 31:


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)
	2013			2012			2013		2012				2013		2012
Commodities contracts	$	(0.1	)	$	0.1	Cost of products sold	$	-	$	-		Cost of products sold	$	-	$	-
Foreign currency contracts		1.8			0.6	Cost of products sold		0.6		(0.3	)	N/A		-		-

	$	1.7		$	0.7		$	0.6	$	(0.3	)		$	-	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of loss recognized in earnings from operations on derivative		Amount of loss recognized in earnings from operations on derivative
				2013		2012
Equity collar contract		Other expense - net	$	-	$	17.9

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.


(dollars in millions)
	March 31,
	2013				2012
	Buy		Sell		Buy		Sell
British pound	$	-	$	1.7	$	-	$	-
Canadian dollar		-		27.5		-		27.4
Chinese renminbi		-		-		5.7		-
Euro		17.2		1.5		12.2		0.9
Mexican peso		16.6		-		13.9		-

Total	$	33.8	$	30.7	$	31.8	$	28.3

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

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

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


		Fair Value
(dollars in millions)	Balance Sheet Location	March 31, 2013			December 31, 2012
Foreign currency contracts	Other current assets	$	2.4		$	1.7
	Accrued liabilities		(0.1	)		(0.5	)

Total derivatives designated as hedging instruments		$	2.3		$	1.2

- 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

Operations by Segment

3 Months Ended

Mar. 31, 2013

Operations by Segment

10.

Operations by Segment

The company is comprised of two reporting segments: North America and Rest of World. The Rest of World segment is primarily comprised of China, India and Europe. 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 in Asia.


	(dollars in millions)
	Three Months Ended March 31,
	2013			2012
Net sales
North America	$	378.7		$	353.3
Rest of World		138.3			124.2
Inter-segment sales		(7.4	)		(8.9	)

	$	509.6		$	468.6

Operating earnings
North America ^(1) (3) (4)	$	54.1		$	42.2
Rest of World		18.2			14.2

		72.3			56.4

Corporate (expense) income ^(2) (5)		(13.7	)		16.5
Interest expense		(1.5	)		(3.0	)

Earnings before income taxes		57.1			69.9
Provision for income taxes		18.1			22.4

Earnings from continuing operations	$	39.0		$	47.5

⁽¹⁾ Includes non-operating pension costs of:	$	(3.6	)	$	(1.0	)
⁽²⁾ Includes non-operating pension costs of:	$	(1.2	)	$	(0.6	)
⁽³⁾ Includes settlement income of:	$	11.0		$	-
⁽⁴⁾ Includes restructuring and impairment expense of:	$	(12.7	)	$	-
⁽⁵⁾ Includes net gain on shares of stock of:	$	-		$	27.2

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Inventories


	(dollars in millions)
	March 31, 2013			December 31, 2012
Finished products	$	78.6		$	74.4
Work in process		13.0			12.0
Raw materials		101.2			100.0

		192.8			186.4
LIFO reserve		(23.0	)		(23.0	)

	$	169.8		$	163.4

Pensions

3 Months Ended

Mar. 31, 2013

Pensions

9.	Pensions

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


	(dollars in millions)
	Three Months Ended March 31,
	2013			2012
Service cost	$	2.3		$	2.0
Interest cost		9.8			10.8
Expected return on plan assets		(15.4	)		(17.3	)
Amortization of unrecognized loss		10.4			8.0
Amortization of prior service cost		(0.2	)		(0.2	)

Defined benefit plan expense	$	6.9		$	3.3

The company did not make a contribution to its U.S. pension plan in 2012 and does not anticipate making a contribution in 2013.

- 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

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-Number FAS88
-Paragraph 63
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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)
-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.

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-Publisher FASB
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-Number 132R
-Paragraph 8
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-Number 132R
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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 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 158
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-Publisher FASB
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-Number FAS106-2
-Paragraph 20, 21, 22
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Principles Board Opinion (APB)
-Number 30
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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

Changes in Accumulated Other Comprehensive Loss by Component

3 Months Ended

Mar. 31, 2013

Changes in Accumulated Other Comprehensive Loss by Component

15.

Changes in Accumulated Other Comprehensive Loss by Component

Changes to accumulated other comprehensive loss by component for the three months ended March 31, 2013 are as follows:


	(dollars in millions)
	Cumulative Foreign Currency Translation			Unrealized Net Gain (Loss) on Cash Flow Derivatives			Pension Liability			Total
Balance at December 31, 2012	$	19.5		$	0.7		$	(340.7	)	$	(320.5	)
Other comprehensive (loss) earnings before reclassifications		(1.5	)		1.1			-			(0.4	)
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		-			(0.4	)		6.3			5.9

Balance at March 31, 2013	$	18.0		$	1.4		$	(334.4	)	$	(315.0	)

⁽¹⁾ Amounts reclassified from accumulated other comprehensive loss:
Realized losses on derivatives reclassified to cost of products sold		(0.6	)
Tax benefit		0.2

Reclassification net of tax	$	(0.4	)

Amortization of pension items:
Actuarial losses	$	10.4	⁽²⁾
Prior year service cost		(0.2	)⁽²⁾

		10.2
Tax benefit		(3.9	)

Reclassification net of tax	$	6.3

⁽²⁾

These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 9 - Pensions for additional details.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.3-04)
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
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+ Details

Condensed Consolidated Statements Of Comprehensive Earnings (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Unrealized net gain (loss) on cash flow derivative instruments, related income tax (provision) benefit	$ (0.4)	$ (0.4)
Adjustment to additional minimum pension liability loss, related income tax benefit	$ (3.9)
Reversal of unrealized gain on investments less related tax benefit		$ 0.7

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Paragraph 1A
-Subparagraph (c)(3)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
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-Publisher AICPA
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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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 - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Effective tax rate	31.70%	32.00%		30.40%
Unrecognized tax benefits	$ 1.3
Unrecognized tax benefits that would affect the effective tax rate if recognized	$ 0.9
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	2012
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	2012
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	2012
Scenario, Forecast \| Minimum
Income Tax Contingency [Line Items]
Effective tax rate			30.00%
Scenario, Forecast \| Maximum
Income Tax Contingency [Line Items]
Effective tax rate			30.50%

Derivative Instruments

3 Months Ended

Mar. 31, 2013

Derivative Instruments

12.

Derivative Instruments

ASC 815 Derivatives and Hedging, 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, a cash flow hedge, or a hedge of a net investment in a foreign operation.

Equity Collar Contract

On August 22, 2011, the company sold its Electrical Products Company (EPC) to Regal Beloit Corporation (RBC) and received approximately 2.83 million shares of RBC common stock. The RBC share price appreciated in the first quarter of 2011 during which the company entered into an equity collar contract for 50 percent of the RBC shares to protect a portion of that appreciation. The put strike price of the equity collar 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 2012 with no value.

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 and equity investment volatility. Derivative instruments are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The company does not enter into contracts for speculative purposes. The contracts are executed with major financial institutions with no credit loss anticipated for failure of the counterparties to perform.

Foreign Currency Forward Contracts

The company is exposed to foreign currency exchange risk as a result of transactions in currencies other than the functional currency of certain subsidiaries. The company utilizes foreign currency forward purchase and sale contracts to manage the volatility associated with foreign currency purchases, sales and certain intercompany transactions in the normal course of business. Principal currencies include the Canadian dollar, 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, 2014.

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


(dollars in millions)
	March 31,
	2013				2012
	Buy		Sell		Buy		Sell
British pound	$	-	$	1.7	$	-	$	-
Canadian dollar		-		27.5		-		27.4
Chinese renminbi		-		-		5.7		-
Euro		17.2		1.5		12.2		0.9
Mexican peso		16.6		-		13.9		-

Total	$	33.8	$	30.7	$	31.8	$	28.3

Commodity Futures Contracts

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

The minimal after-tax loss of the effective portion of the contracts as of March 31, 2013 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. Commodity hedges outstanding at March 31, 2013 involve a total of approximately 0.4 million pounds of copper.

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

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


		Fair Value
(dollars in millions)	Balance Sheet Location	March 31, 2013			December 31, 2012
Foreign currency contracts	Other current assets	$	2.4		$	1.7
	Accrued liabilities		(0.1	)		(0.5	)

Total derivatives designated as hedging instruments		$	2.3		$	1.2

The effect of derivatives designated as hedging instruments under ASC 815 on the Statement of Earnings:

Three Months Ended March 31:


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)
	2013			2012			2013		2012				2013		2012
Commodities contracts	$	(0.1	)	$	0.1	Cost of products sold	$	-	$	-		Cost of products sold	$	-	$	-
Foreign currency contracts		1.8			0.6	Cost of products sold		0.6		(0.3	)	N/A		-		-

	$	1.7		$	0.7		$	0.6	$	(0.3	)		$	-	$	-


Derivatives not designated as a hedging instrument under ASC 815	Location of loss recognized in earnings from operations on derivative		Amount of loss recognized in earnings from operations on derivative
				2013		2012
Equity collar contract		Other expense - net	$	-	$	17.9

- 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
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 21: 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.

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-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

Changes in Accumulated Other Comprehensive Loss by Component (Detail)
$ in Millions

3 Months Ended

Mar. 31, 2013

USD ($)

Schedule of Amounts in Accumulated Other Comprehensive Income Loss [Line Items]

Accumulated Other Comprehensive Income loss Beginning Balance

$ (320.5)

Other comprehensive (loss) earnings before reclassifications

(0.4)

Amounts reclassified from accumulated other comprehensive loss:

5.9

^[1]

Accumulated Other Comprehensive Income loss Ending Balance

(315.0)

Cumulative Foreign Currency Translation Adjustments

Schedule of Amounts in Accumulated Other Comprehensive Income Loss [Line Items]

Accumulated Other Comprehensive Income loss Beginning Balance

19.5

Other comprehensive (loss) earnings before reclassifications

(1.5)

Accumulated Other Comprehensive Income loss Ending Balance

18.0

Unrealized Gains (Losses) on Cash Flow Hedges

Schedule of Amounts in Accumulated Other Comprehensive Income Loss [Line Items]

Accumulated Other Comprehensive Income loss Beginning Balance

0.7

Other comprehensive (loss) earnings before reclassifications

1.1

Amounts reclassified from accumulated other comprehensive loss:

(0.4)

^[1]

Accumulated Other Comprehensive Income loss Ending Balance

1.4

Pension Liabilities

Schedule of Amounts in Accumulated Other Comprehensive Income Loss [Line Items]

Accumulated Other Comprehensive Income loss Beginning Balance

(340.7)

Amounts reclassified from accumulated other comprehensive loss:

6.3

^[1]

Accumulated Other Comprehensive Income loss Ending Balance

$ (334.4)

[1]

Amounts reclassified from accumulated other comprehensive loss: Realized losses on derivatives reclassified to cost of products sold (0.6 ) Tax benefit 0.2 Reclassification net of tax $ (0.4 ) Amortization of pension items: Actuarial losses $ 10.4 (2) Prior year service cost (0.2 ) (2) 10.2 Tax benefit (3.9 ) Reclassification net of tax $ 6.3

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Earnings per Share of Common Stock (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31,
	2013		2012
Denominator for basic earnings per share - weighted average shares		92,551,062		92,206,386
Effect of dilutive stock options		633,828		770,286

Denominator for diluted earnings per share		93,184,890		92,976,672

Acquisition

3 Months Ended

Mar. 31, 2013

Acquisition

2.	Acquisition

On February 14, 2013, the company acquired 100 percent of the shares of MIM Isitma Sogutma Havalandirma ve Aritma Sistemleri San. Tic. A.S. (MIM), a privately-held Turkish water treatment company. The addition of MIM expands the company’s product offerings and gives the company access to Eastern Europe and Black Sea region water treatment markets. MIM is included in the Rest of World segment.

The company paid an aggregate cash purchase price of $6.1 million, subject to a finalization of working capital adjustments and contingent consideration, the fair value of which has been estimated at $1.0 million.

The fair value of the purchase price has preliminarily resulted in an allocation to acquired intangible assets totaling $4.8 million of which $2.0 million has been assigned to customer lists which are being amortized over ten years.

MIM’s results of operations have been included in the company’s financial statements from February 14, 2013, the date of acquisition. Revenues and pre-tax results associated with MIM included in results of operations in the quarter ended March 31, 2013 are not material to the company’s net sales or pre-tax earnings.

- 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 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph F4
-Subparagraph e
-Appendix F

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-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 19: 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.

+ Details

Inventories

3 Months Ended

Mar. 31, 2013

Inventories

4.	Inventories


	(dollars in millions)
	March 31, 2013			December 31, 2012
Finished products	$	78.6		$	74.4
Work in process		13.0			12.0
Raw materials		101.2			100.0

		192.8			186.4
LIFO reserve		(23.0	)		(23.0	)

	$	169.8		$	163.4

Investment in RBC Shares - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 22, 2011	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2011
Schedule of Investments [Line Items]
Proceeds from sale of business segment, shares	2,830
Unrealized after-tax gain on available for sale securities			$ (1.2)	$ 1.2
Net proceeds from sale of business segment			$ 187.6
RBC share price per share			$ 66.19
Net pre tax gain			$ 27.2
Proceeds from sale of shares			43.2
Gain recognized			1.9
Collar value, write off				$ 17.9
Net proceeds from sale of securities		$ 83.0	122.9
Receivable from sale of securities			$ 64.7

Changes in Option Awards All of Which Related to Common Stock (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Avg. Per Share Exercise Price, beginning period \| $ / shares	$ 16.72
Weighted- Avg. Per Share Exercise Price - Granted \| $ / shares	34.96
Weighted- Avg. Per Share Exercise Price - Exercised \| $ / shares	13.37
Weighted- Avg. Per Share Exercise Price - Forfeited \| $ / shares	30.66
Weighted-Avg. Per Share Exercise Price, ending period \| $ / shares	21.01
Weighted- Avg. Per Share Exercise Price, Exercisable \| $ / shares	$ 15.34
Outstanding, Beginning Balance \| shares	1,530,734
Granted \| shares	352,200
Exercised \| shares	(221,740)
Forfeited \| shares	(1,866)
Outstanding, Ending Balance \| shares	1,659,328
Exercisable at End of Period \| shares	957,222
Average Remaining Contractual Life, Outstanding at End of Period, Years	8 years
Average Remaining Contractual Life, Exercisable at End of Period, Years	7 years
Aggregate Intrinsic Value, Outstanding at End of Period \| $	$ 26.2
Aggregate Intrinsic Value, Exercisable at End of Period \| $	$ 20.5

Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Changes in Option Shares

Changes in option awards, all of which relate to Common Stock, were as follows for the three months ended March 31, 2013:


	Weighted-Avg. Per Share Exercise Price		Three Months Ended March 31, 2013			Average Remaining Contractual Life		Aggregate Intrinsic Value (dollars in millions)

Outstanding at January 1, 2013	$	16.72		1,530,734

Granted		34.96		352,200

Exercised		13.37		(221,740	)

Forfeited		30.66		(1,866	)


Outstanding at March 31, 2013		21.01		1,659,328			8 years	$	26.2


Exercisable at March 31, 2013	$	15.34		957,222			7 years	$	20.5

Schedule of Weighted Average Fair Value per Option at Date of Grant


	Three Months Ended March 31,
	2013			2012
Expected life (years)		6.1			6.2
Risk-free interest rate		2.0	%		2.0	%
Dividend yield		1.1	%		1.4	%
Expected volatility		38.4	%		39.4	%

Schedule of Share Unit Activity Under Plan

A summary of share unit activity under the plan is as follows for the three months ended March 31, 2013:


	Number of Units			Weighted-Average Grant Date Value

Issued and unvested at January 1, 2013		469,012		$	19.37

Granted		141,200			34.58

Vested		(157,732	)		13.97

Forfeited/cancelled		(8,550	)		27.23


Issued and unvested at March 31, 2013		443,930		$	25.98

Effect of Derivative Instruments on Statement of Earnings for Continuing and Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	$ 1.7	$ 0.7
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	0.6	(0.3)
Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
Commodities Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	(0.1)	0.1
Commodities Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
Foreign Currency Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	1.8	0.6
Amount of gain/(loss) recognized in earnings on a derivative (ineffective portion)
Foreign Currency Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from Accumulated OCI into earnings (effective portion)	$ 0.6	(0.3)
Not Designated as Hedging Instrument \| Equity Collar Contract \| Other Expense - Net
Derivative [Line Items]
Amount of loss recognized in earnings from continuing operations on derivative		$ 17.9

Product Warranties (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Product Warranty Liability Activity

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)
	Three Months Ended March 31,
	2013			2012
Balance at January 1	$	129.6		$	131.9
Expense		15.0			15.4
Claims settled		(15.7	)		(15.3	)

Balance at March 31	$	128.9		$	132.0

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2013	Dec. 31, 2012
Class A Common Stock, par value	$ 5	$ 5
Class A Common Stock, authorized	14,000,000	14,000,000
Class A Common Stock, issued	13,304,280	13,309,876
Common Stock, par value	$ 1	$ 1
Common Stock, authorized	120,000,000	120,000,000
Common Stock, shares issued	82,033,936	82,049,542

Long-Term Debt - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Line of Credit Facility [Line Items]
Multi-currency revolving credit agreement	$ 400
Number of banks involved in multi-year multi-currency revolving credit agreement	8
Revolving credit facility, expiration date	Dec. 12, 2017
Multi-currency revolving credit agreement, maximum amount	$ 500

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Assets Measured at Fair Value on Recurring Basis

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


Fair Value Measurement Using	March 31, 2013			December 31, 2012
Quoted prices in active markets for identical assets (Level 1)	$	146.8		$	197.2
Significant other observable inputs (Level 2)		(0.1	)		-

Total assets measured at fair value	$	146.7		$	197.2

- Definition

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

+ References + Details

Schedule of Computation of Basic and Diluted Weighted-Average Shares Used in Earnings per Share Calculations (Detail) - shares	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share Of Common Stock [Abstract]
Denominator for basic earnings per share -weighted average shares	92,551,062	92,206,386
Effect of dilutive stock options	633,828	770,286
Denominator for diluted earnings per share	93,184,890	92,976,672

- 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
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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
-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)
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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 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: 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 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.

+ Details

Acquisition - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Apr. 14, 2013	Feb. 14, 2013
Customer Lists
Business Acquisition [Line Items]
Acquired intangible assets, amortization period, in years	10 years
MIM Isitma Sogutma Havalandirma ve Aritma Sistemleri San Tic A S
Business Acquisition [Line Items]
Percentage of shares acquired		100.00%
Cash acquired from acquisition	$ 6.1
Estimated fair value of the contingent payment	1.0
Acquired intangible assets	4.8
MIM Isitma Sogutma Havalandirma ve Aritma Sistemleri San Tic A S \| Customer Lists
Business Acquisition [Line Items]
Acquired intangible assets subject to amortization	$ 2.0

- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: 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.

+ Details

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

1 Months Ended

3 Months Ended

Mar. 11, 2013

Mar. 31, 2013

Mar. 31, 2012

Segment Reporting Information [Line Items]

Net sales

$ 509.6

$ 468.6

Operating earnings

72.3

56.4

Corporate income (expense)

^[1],[2]

(13.7)

16.5

Interest expense

(1.5)

(3.0)

Earnings before income taxes

57.1

69.9

Provision for income taxes

$ 4.2

18.1

22.4

Earnings from continuing operations

39.0

47.5

North America

Segment Reporting Information [Line Items]

Net sales

378.7

353.3

Operating earnings

^[3],[4],[5]

54.1

42.2

Rest of World

Segment Reporting Information [Line Items]

Net sales

138.3

124.2

Operating earnings

18.2

14.2

Inter-Segment Sales

Segment Reporting Information [Line Items]

Net sales

$ (7.4)

$ (8.9)

[1]	Includes net gain on shares of stock of: $ - $ 27.2
[2]	Includes non-operating pension costs of: $ (1.2 ) $ (0.6 )
[3]	Includes non-operating pension costs of: $ (3.6 ) $ (1.0 )
[4]	Includes restructuring and impairment expense of: $ (12.7 ) $ -
[5]	Includes settlement income of: $ 11.0 $ -

Changes in Accumulated Other Comprehensive Loss by Component (Parenthetical) (Detail) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Schedule of Amounts in Accumulated Other Comprehensive Income Loss [Line Items]

Reclassification net of tax

$ 0.6

$ (0.3)

Actuarial losses

(10.4)

(8.0)

Prior year service cost

0.2

$ 0.2

Reclassification net of tax

6.3

Reclassification out of Accumulated Other Comprehensive Income

Schedule of Amounts in Accumulated Other Comprehensive Income Loss [Line Items]

Realized losses on derivatives reclassified to cost of products sold

(0.6)

Tax benefit

0.2

Reclassification net of tax

(0.4)

Actuarial losses

^[1]

10.4

Prior year service cost

^[1]

(0.2)

Other Comprehensive Income Defined Benefit Plans Adjustment Change In Period

10.2

Tax benefit

(3.9)

Reclassification net of tax

$ 6.3

[1]	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 9-Pensions for additional details.

Restructuring, Impairment and Settlement Expense-Net

3 Months Ended

Mar. 31, 2013

Restructuring, Impairment and Settlement Expense-Net

3.	Restructuring, Impairment and Settlement Expense - Net

In the first quarter 2013, the company announced a move of manufacturing operations from its Fergus, Ontario facility to other North American facilities and recognized $12.7 million of restructuring and impairment expenses, comprised of $5.2 million of severance costs and impairment charges related to long-lived assets totaling $7.5 million and a corresponding $3.2 million tax benefit related to the charge. The company anticipates the transition will be substantially completed by July 1, 2013.

On March 11, 2013, the company entered into a settlement agreement with a former supplier of a North American subsidiary regarding previous overcharges and warranty costs. The terms of the settlement agreement resulted in an $11.0 million cash payment to the company, a pre-tax gain of $11.0 million and a related $4.2 million tax expense.

The following table presents an analysis of the company’s restructuring, impairment and settlement reserve as of and for three months ended March 31, 2013 (dollars in millions):


	Severance Costs		Asset Impairment				Settlement Income			Total
Balance at December 31, 2012	$	-		$	-		$	-		$	-
Expense (income) recognized		5.2			7.5			(11.0	)		1.7
Asset write-down		-			(7.5	)		-			(7.5	)
Settlement income		-			-			11.0			11.0

Balance at March 31, 2013	$	5.2		$	-		$	-		$	5.2

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Restructuring, Impairment and Settlement Expense-Net - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 11, 2013	Mar. 31, 2013	Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment expense		$ 12.7
Severance costs and impairment expense		5.2
Impairment charges related to long-lived asset		7.5
Tax benefit related to charge		3.2
Recovery of costs and damages from vendors	$ 11.0
Gain recognized on legal settlement	11.0
Related tax expense	$ 4.2	$ 18.1	$ 22.4

- Definition

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

+ References

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-Publisher SEC
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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+ Details

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

+ References

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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Pensions (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31,
	2013			2012
Service cost	$	2.3		$	2.0
Interest cost		9.8			10.8
Expected return on plan assets		(15.4	)		(17.3	)
Amortization of unrecognized loss		10.4			8.0
Amortization of prior service cost		(0.2	)		(0.2	)

Defined benefit plan expense	$	6.9		$	3.3

Long-Term Debt

3 Months Ended

Mar. 31, 2013

Long-Term Debt

5.	Long-Term Debt

The company has a $400 million multi-currency revolving credit agreement with eight banks. The facility expires on December 12, 2017 and has an accordion provision which allows it to be increased up to $500 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 $400 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 March 31, 2013.

Earnings Per Share Common Stock - Additional Information (Detail) - Subsequent Event	1 Months Ended	3 Months Ended
	Apr. 15, 2013	Mar. 31, 2013
Earnings Per Share Disclosure [Line Items]
Stock split ratio	2
Dividend payable date		May 15, 2013