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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2016	Aug. 02, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
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 Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		13,112,042
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		74,134,191

CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net sales	$ 667.0	$ 653.5	$ 1,303.9	$ 1,272.0
Cost of products sold	383.3	391.1	757.5	780.4
Gross profit	283.7	262.4	546.4	491.6
Selling, general and administrative expenses	160.0	159.4	319.4	306.6
Interest expense	1.9	2.5	3.6	4.4
Other income	(2.3)	(2.7)	(4.3)	(5.4)
Earnings before income taxes	124.1	103.2	227.7	186.0
Provision for income taxes	37.0	32.1	67.1	56.5
Net Earnings	$ 87.1	$ 71.1	$ 160.6	$ 129.5
Net Earnings Per Share of Common Stock	$ 1.00	$ 0.80	$ 1.83	$ 1.45
Diluted Net Earnings Per Share of Common Stock	0.98	0.79	1.81	1.44
Dividends Per Share of Common Stock	$ 0.24	$ 0.19	$ 0.48	$ 0.38

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net earnings	$ 87.1	$ 71.1	$ 160.6	$ 129.5
Other comprehensive (loss) earnings
Foreign currency translation adjustments	(17.1)	(0.9)	(8.5)	(10.2)
Unrealized net gains (losses) on cash flow derivative instruments, less related income tax (provision) benefit of $(0.3) and $0.9 in 2016, $0.8 and $- in 2015	0.5	(1.2)	(1.5)
Adjustment to pension liability, less related income tax benefit (provision) of $1.7 and $0.2 in 2016 and $(2.3) and $(3.9) in 2015	(2.6)	3.7	(0.1)	6.2
Comprehensive Earnings	$ 67.9	$ 72.7	$ 150.5	$ 125.5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Unrealized net gains (losses) on cash flow derivative instruments, related income tax provision	$ (0.3)	$ 0.8	$ 0.9
Adjustment to pension liability, related income tax benefit (provision)	$ 1.7	$ (2.3)	$ 0.2	$ (3.9)

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 287.4	$ 323.6
Marketable securities	379.8	321.6
Receivables	493.9	501.4
Inventories	237.8	222.9
Other current assets	50.1	45.9
Total Current Assets	1,449.0	1,415.4
Property, plant and equipment	899.5	866.8
Less accumulated depreciation	(447.8)	(424.1)
Net property, plant and equipment	451.7	442.7
Goodwill	423.4	420.9
Other intangibles	285.4	291.0
Other assets	62.7	59.2
Total Assets	2,672.2	2,629.2
Liabilities
Trade payables	402.0	424.9
Accrued payroll and benefits	68.7	81.6
Accrued liabilities	92.7	90.1
Product warranties	44.8	43.7
Debt due within one year	7.4	12.9
Total Current Liabilities	615.6	653.2
Long-term debt	274.6	236.1
Pension liabilities	131.2	134.2
Other liabilities	170.1	163.4
Total Liabilities	1,191.5	1,186.9
Stockholders' Equity
Common Stock, value	82.2	82.2
Capital in excess of par value	622.6	617.4
Retained earnings	1,469.1	1,350.7
Accumulated other comprehensive loss	(323.5)	(313.4)
Treasury stock at cost	(435.6)	(360.5)
Total Stockholders' Equity	1,480.7	1,442.3
Total Liabilities and Stockholders' Equity	2,672.2	2,629.2
Common Class A
Stockholders' Equity
Common Stock, value	$ 65.9	$ 65.9

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Common Stock, par value	$ 1	$ 1
Common Stock, shares authorized	120,000,000	120,000,000
Common Stock, shares issued	82,176,304	82,167,098
Common Class A
Common Stock, par value	$ 5	$ 5
Common Stock, shares authorized	14,000,000	14,000,000
Common Stock, shares issued	13,177,492	13,186,698

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities
Net earnings	$ 160.6	$ 129.5
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:
Depreciation and amortization	32.1	31.6
Pension income	(3.1)
Stock based compensation expense	6.9	6.8
Loss on disposal of assets		0.2
Net changes in operating assets and liabilities:
Current assets and liabilities	(44.8)	(94.3)
Noncurrent assets and liabilities	4.1	(12.0)
Cash Provided by Operating Activities - continuing operations	155.8	61.8
Cash Used in Operating Activities - discontinued operations	(0.7)	(0.6)
Cash Provided by Operating Activities	155.1	61.2
Investing Activities
Capital expenditures	(37.7)	(31.0)
Investments in marketable securities	(310.1)	(237.7)
Net proceeds from sale of marketable securities	244.2	156.1
Cash Used in Investing Activities	(103.6)	(112.6)
Financing Activities
Term debt (repaid) incurred	(10.5)	64.4
Long-term debt incurred (repaid)	42.6	(7.2)
Common stock repurchases	(82.2)	(47.3)
Net proceeds from stock option activity	4.6	4.2
Dividends paid	(42.2)	(34.0)
Cash Used in Financing Activities	(87.7)	(19.9)
Net decrease in cash and cash equivalents	(36.2)	(71.3)
Cash and cash equivalents - beginning of period	323.6	319.4
Cash and Cash Equivalents - End of Period	$ 287.4	$ 248.1

Basis of Presentation

6 Months Ended

Jun. 30, 2016

Basis of Presentation

1.	Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all of the information and footnotes required for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2016 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 Annual Report on Form 10-K for the year ended December 31, 2015 filed with the SEC on February 17, 2016.

Recent Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (FASB) amended Accounting Standard Codification (ASC) 718, Compensation - Stock Compensation (issued under Accounting Standards Update (ASU) 2016-09). This amendment simplified several aspects of the accounting for share-based payment transactions. The amendment required adoption for periods beginning January 1, 2017 and permitted early adoption. The Company adopted this amendment effective January 1, 2016.

The amendment required the benefits or deficiencies of tax deductions in excess of or less than the recognized compensation cost to be recorded as income tax benefit or expense in the income statement in the period in which they occurred. The amendment also eliminated previous guidance that required unrecognized future excess income tax benefits to be used to repurchase shares in the calculation of diluted shares which resulted in lower diluted shares outstanding than the calculation under the amendment. The Company elected to apply this guidance prospectively. As such, in the second quarter and first six months of 2016, the Company recognized $2.9 million and $5.4 million, respectively, of discrete income tax benefits associated with excess tax benefits on settled stock based compensation awards and the Company’s diluted shares outstanding for the three and six months ended June 30, 2016 increased as compared to the way it was calculated under previous guidance.

The amendment also required that cash paid by an employer to a taxing authority when shares are directly withheld for employee income tax withholding purposes be classified as financing activities in the statements of cash flows. As required, the Company applied this guidance retrospectively in the presentation of the consolidated statements of cash flows for the periods beginning January 1, 2015 and, as a result, reclassified $3 million of cash paid from operating activities to cash paid from financing activities for the six months ended June 30, 2015.

In February 2016, the FASB amended ASC 842, Leases (issued under ASU 2016-02). This amendment requires the recognition of lease assets and lease liabilities on the balance sheet for most leasing arrangements currently classified as operating leases. This amendment is effective for periods beginning January 1, 2019 and early adoption is permitted. The Company is in the process of determining whether the adoption of ASU 2016-02 will have a material impact on its consolidated balance sheets, statements of earnings or statements of cash flows.

In November 2015, the FASB amended ASC 740, Income Taxes (issued under ASU 2015-17). This amendment required that deferred tax assets and liabilities be classified as noncurrent on the balance sheet. The amendment was effective for periods beginning January 1, 2016 and allowed for either prospective adoption or retrospective adoption. The Company adopted ASU 2015-17 retrospectively and, as a result, has classified all deferred tax assets and liabilities as non-current on the Company’s consolidated balance sheets for all periods presented. Current deferred taxes of $40.5 million as of December 31, 2015 were reclassified to non-current deferred taxes on the Company’s consolidated balance sheet.

In July 2015, the FASB amended ASC 330, Inventory (issued under ASU 2015-11, “Simplifying the Measurement of Inventory.”) This amendment requires inventory that is recorded using the first-in, first-out method to be measured at the lower of cost or net realizable value. ASU 2015-11 will be effective prospectively for the Company beginning January 1, 2017. The Company does not expect the adoption of ASU 2015-11 to have a significant impact on its consolidated balance sheets, statements of earnings or statements of cash flows.

In May 2014, the FASB issued ASC 606-10, Revenue from Contracts with Customers (issued under ASU 2014-09). ASC 606-10 will replace all existing revenue recognition guidance when effective. In July 2015, the FASB approved a one year deferral of the effective date to periods beginning January 1, 2018, with early application permitted as of January 1, 2017. Either full retrospective adoption or modified retrospective adoption is allowed under ASC 606-10. The Company is in the process of determining whether the adoption of ASC 606-10 will have an impact on its consolidated balance sheets, statements of earnings or statements of cash flows.

Inventories

6 Months Ended

Jun. 30, 2016

Inventories

2.	Inventories

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


(dollars in millions)	June 30, 2016			December 31, 2015
Finished products	$	101.3		$	85.7
Work in process		12.2			13.4
Raw materials		134.0			139.6

Inventories, at FIFO cost		247.5			238.7
LIFO reserve		(9.7	)		(15.8	)

Net inventory	$	237.8		$	222.9

Product Warranties

6 Months Ended

Jun. 30, 2016

Product Warranties

3.	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.


	Three Months Ended June 30,
(dollars in millions)	2016			2015
Balance at April 1,	$	140.6		$	137.2
Expense		16.0			15.3
Claims settled		(15.1	)		(14.2	)

Balance at June 30,	$	141.5		$	138.3


	Six Months Ended June 30,
(dollars in millions)	2016			2015
Balance at January 1,	$	139.4		$	136.2
Expense		32.3			32.5
Claims settled		(30.2	)		(30.4	)

Balance at June 30,	$	141.5		$	138.3

Long-Term Debt

6 Months Ended

Jun. 30, 2016

Long-Term Debt

4.	Long-Term Debt

The Company has a $400 million multi-currency revolving credit agreement with eight banks, which expires on December 12, 2017. The facility has an accordion provision which allows it to be increased up to $500 million if certain conditions (including lender approval) are satisfied.

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 Company’s commercial paper and credit line borrowings are classified as long-term debt at June 30, 2016.

On January 15, 2015, the Company issued $75 million in term notes to an insurance company. Principal payments commence in 2020 and the notes mature in 2030. The notes have an interest rate of 3.52 percent. Proceeds of the notes were used to pay down borrowings under the Company’s revolving credit facility.

Earnings per Share of Common Stock

6 Months Ended

Jun. 30, 2016

Earnings per Share of Common Stock

5.	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 June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Denominator for basic earnings per share – weighted average shares		87,480,860		89,139,114		87,663,931		89,286,984
Effect of dilutive stock options and share units		1,018,500		686,041		1,038,392		708,193

Denominator for diluted earnings per share		88,499,360		89,825,155		88,702,323		89,995,177

Stock Based Compensation

6 Months Ended

Jun. 30, 2016

Stock Based Compensation

6.	Stock Based Compensation

The Company adopted the A. O. Smith Combined Incentive Compensation Plan (the “Plan”) effective January 1, 2007. The Plan was reapproved by stockholders on April 16, 2012. The Plan is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by stockholders in 2002. The number of shares available for granting of options or share units at June 30, 2016 was 1,644,845. Upon stock option exercise or share unit vesting, shares are issued from treasury stock.

Total stock based compensation expense recognized in the three months ended June 30, 2016 and 2015 was $1.8 million and $1.1 million, respectively. Total stock based compensation expense recognized in the six months ended June 30, 2016 and 2015 was $6.9 million and $6.8 million, respectively.

Stock Options

The stock options granted in the six months ended June 30, 2016 and 2015 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 2016 and 2015 expire ten years after date of grant. The Company’s stock options are expensed ratably over the three-year vesting period; however, included in the stock option expense for the three and six months ended June 30, 2016 and 2015 was expense associated with the accelerated vesting of stock option awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period. Stock based compensation expense attributable to stock options in the three months ended June 30, 2016 and 2015 was $0.9 million and $0.5 million, respectively. Stock based compensation expense attributable to stock options in the six months ended June 30, 2016 and 2015 was $3.4 million and $3.1 million, respectively.

Changes in option awards, all of which relate to Common Stock, were as follows for the six months ended June 30, 2016:


	Weighted-Avg. Per Share Exercise Price		Number of Options			Average Remaining Contractual Life		Aggregate Intrinsic Value (dollars in millions)
Outstanding at January 1, 2016	$	36.05		1,326,779
Granted		63.06		266,885
Exercised		27.04		(231,602	)
Forfeited		56.38		(1,533	)

Outstanding at June 30, 2016		42.86		1,360,529			7 years	$	61.6

Exercisable at June 30, 2016	$	32.40		834,556			6 years	$	46.5

The weighted-average fair value per option at the date of grant during the six months ended June 30, 2016 and 2015 using the Black-Scholes option-pricing model was $15.78 and $17.17, respectively. Assumptions were as follows:


	Six Months Ended June 30,
	2016			2015
Expected life (years)		5.8			5.9
Risk-free interest rate		1.7	%		2.0	%
Dividend yield		1.3	%		1.0	%
Expected volatility		27.8	%		29.3	%

The expected life of options for purposes of this model is based on historical exercise behavior. The risk-free interest rate for purposes of this model is based on the U.S. Treasury yield curve in effect on the date of grant for the respective expected life of the option. The expected dividend yield for purposes of this model is based on the dividends paid on Common Stock in the preceding four quarters divided by the grant date market value of the Company’s Common Stock. The expected volatility for purposes of this model is based on the historical volatility of the Company’s Common Stock.

Stock Appreciations Rights (SAR)

Certain non-U.S.-based employees have been granted SARs. Each SAR award grants the employee the right to receive cash equal to the excess of the share price of the Common Stock on the date that a participant exercises such right over the grant date price of the stock. SARs granted have three year pro rata vesting from the date of grant. SARs were issued at exercise prices equal to the fair value of Common Stock on the date of grant and expire ten years from the date of grant. Compensation expense for SARs is initially measured based on the fair value on the date of grant using the Black-Scholes option-pricing model, using assumptions similar to stock option awards. SARs are subsequently remeasured at each reporting period based on a revised Black-Scholes value. No SARs were granted in 2016. As of June 30, 2016, there were 12,470 SARs outstanding and 4,163 were exercisable. In the six months ended June 30, 2016, 215 SARs were exercised and 430 SARs were forfeited. In the first six months of 2015, the Company granted 13,115 cash-settled SARs.

Restricted Stock and Share Units

Participants may also be awarded shares of restricted stock or share units under the Plan. The Company granted 77,740 and 76,035 share units under the Plan in the six months ended June 30, 2016 and 2015, respectively. The share units were valued at $4.9 million and $4.7 million at the dates of issuance in 2016 and 2015, respectively, based on the prices of the Common Stock at the dates of grant. The share units are recognized as compensation expense ratably over the three-year vesting period; however, included in share unit expense in the three and six months ended June 30, 2016 and 2015 was 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. Stock based compensation expense attributable to share units of $0.9 million and $0.6 million was recognized in the three months ended June 30, 2016 and 2015, respectively. Stock based compensation expense attributable to share units of $3.5 million and $3.7 million was recognized in the six months ended June 30, 2016 and 2015, respectively. Certain non-U.S.-based employees receive the cash value of vested shares at the vesting date in lieu of shares.

A summary of share unit activity under the Plan for the six months ended June 30, 2016:


	Number of Units			Weighted-Average Grant Date Value
Issued and unvested at January 1, 2016		329,262		$	44.30
Granted		77,740			63.47
Vested		(132,953	)		34.71
Forfeited		(1,030	)		59.17

Issued and unvested at June 30, 2016		273,019		$	54.59

- 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 + Details

Pensions

6 Months Ended

Jun. 30, 2016

Pensions

7.	Pensions

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


	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in millions)	2016			2015			2016			2015
Service cost	$	0.4		$	0.5		$	0.9		$	1.0
Interest cost		7.7			9.4			15.3			18.8
Expected return on plan assets		(13.8	)		(14.5	)		(27.6	)		(28.8	)
Amortization of unrecognized loss		4.5			4.8			8.8			9.5
Amortization of prior service cost		(0.2	)		(0.2	)		(0.5	)		(0.5	)

Defined benefit plan income	$	(1.4	)	$	—		$	(3.1	)	$	—

The Company did not make a contribution to its U.S. pension plan in 2015. The Company is not required to make a contribution in 2016 but does plan to make a voluntary $30 million contribution in the second half of 2016.

Operations by Segment

6 Months Ended

Jun. 30, 2016

Operations by Segment

8.	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, Europe and India. Both segments manufacture and market comprehensive lines of residential and commercial gas, gas tankless and electric water heaters. Both segments primarily manufacture and market in their respective regions of the world. The North America segment also manufactures and globally markets specialty commercial water heating equipment, condensing and non-condensing boilers and water system tanks. Primarily for Asia, the Rest of World segment also manufactures and markets water treatment products. The Company also markets in-home air purification products in China. The following table presents the Company’s results of operations by segment:



	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in millions)	2016			2015			2016			2015
Net sales
North America	$	432.8		$	442.7		$	856.7		$	871.9
Rest of World		239.8			221.3			457.3			417.2
Inter-segment sales		(5.6	)		(10.5	)		(10.1	)		(17.1	)

	$	667.0		$	653.5		$	1,303.9		$	1,272.0

Operating earnings
North America	$	104.2		$	86.0		$	196.1		$	157.2
Rest of World		33.0			30.9			59.8			57.1

		137.2			116.9			255.9			214.3

Corporate expense		(11.2	)		(11.2	)		(24.6	)		(23.9	)
Interest expense		(1.9	)		(2.5	)		(3.6	)		(4.4	)

Earnings before income taxes		124.1			103.2			227.7			186.0
Provision for income taxes		37.0			32.1			67.1			56.5

Net earnings	$	87.1		$	71.1		$	160.6		$	129.5

- 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
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599

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-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

+ Details

Fair Value Measurements

6 Months Ended

Jun. 30, 2016

Fair Value Measurements

9.	Fair Value Measurements

ASC 820, Fair Value Measurements, 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.

The following table presents assets measured at fair value on a recurring basis:


(dollars in millions)
Fair Value Measurement Using	June 30, 2016			December 31, 2015
Quoted prices in active markets for identical assets (Level 1)	$	379.6		$	323.9
Significant other observable inputs (Level 2)		(0.1	)		(0.3	)

Total assets measured at fair value	$	379.5		$	323.6

There were no changes in the Company’s valuation techniques used to measure fair values on a recurring basis during the six months ended June 30, 2016.

- 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 + Details

Derivative Instruments

6 Months Ended

Jun. 30, 2016

Derivative Instruments

10.

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.

The Company designates that all of its hedging instruments 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 loss, 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. 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. Currencies for which the Company utilizes foreign currency forward contracts include the British pound, Canadian dollar, 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.

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



	June 30,
(dollars in millions)	2016				2015
	Buy		Sell		Buy		Sell
British pound	$	—	$	0.5	$	—	$	0.5
Canadian dollar		—		62.7		—		66.7
Euro		12.9		0.9		18.4		0.5
Mexican peso		13.2		—		13.6		—

Total	$	26.1	$	64.1	$	32.0	$	67.7

Commodity Futures Contracts

In addition to entering into supply arrangements in the normal course of business, the Company also entered into futures contracts to fix the cost of certain raw material purchases, principally copper and steel, with the objective of minimizing changes in cost due to market price fluctuations. The Company’s 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 for copper. The Company purchased steel futures contracts on the New York Metals Exchange (NYMEX).

With NYMEX, the Company is required to make cash deposits on unrealized losses on steel derivative contracts.

The after-tax gains and losses on the effective portion of the copper and steel hedge contracts as of June 30, 2016 were recorded in accumulated other comprehensive loss and will be reclassified into cost of products sold in the periods in which the underlying transactions are recorded in earnings. The effective portion of the contracts will be reclassified within one year. Contractual amounts of the Company’s commodities futures contracts were immaterial as of June 30, 2016.

The following tables present the impact of derivative contracts on the Company’s financial statements.

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



(dollars in millions)	Balance Sheet Location	June 30, 2016			December 31, 2015
Foreign currency contracts	Other current assets	$	0.7		$	3.6
	Accrued liabilities		(2.5	)		(1.3	)
Commodities contracts	Other current assets		1.5			—
	Accrued liabilities		(0.1	)		(0.3	)

Total derivatives designated as hedging instruments		$	(0.4	)	$	2.0

The effect of derivatives designated as hedging instruments on the statement of earnings is as follows:


Three Months Ended June 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)		Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)					Location of gain (loss) recognized in earnings on derivative (ineffective portion)		Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015					2016			2015				2016		2015
Foreign currency contracts	$	(1.1	)	$	(0.8	)		Cost of products sold	$	(1.0	)	$	1.2		N/A	$	—	$	—
Commodities contracts		0.8			(0.1	)		Cost of products sold		—			—		Cost of products sold		—		0.1

	$	(0.3	)	$	(0.9	)			$	(1.0	)	$	1.2			$	—	$	0.1


Six Months Ended June 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)		Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)						Location of gain (loss) recognized in earnings on derivative (ineffective portion)		Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015					2016			2015					2016		2015
Foreign currency contracts	$	(4.8	)	$	2.7			Cost of products sold	$	(0.7	)	$	2.7			N/A	$	—	$	—
Commodities contracts		1.7			(0.3	)		Cost of products sold		—			(0.1	)		Cost of products sold		—		—

	$	(3.1	)	$	2.4				$	(0.7	)	$	2.6				$	—	$	—

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

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

Income Taxes

6 Months Ended

Jun. 30, 2016

Income Taxes

11.

Income Taxes

The effective income tax rates for the three and six months ended June 30, 2016 were 29.8 percent and 29.5 percent, respectively. The Company estimates that its annual effective income tax rate for the full year of 2016 will be approximately 30 percent. The effective income tax rates for the three and six months ended June 30, 2015 were 31.1 percent and 30.4 percent, respectively. The full year effective income tax rate in 2015 was 29.7 percent. The lower effective income tax rates in the second quarter and first six months of 2016 compared to the prior year periods were primarily due to the early adoption of a new accounting standard for share based compensation beginning January 1, 2016.

As of June 30, 2016, the Company had $2.6 million of unrecognized tax benefits of which $0.5 million would affect its effective income 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 income tax returns for 2014 and 2015 are subject to audit. The Company is subject to state and local audits for tax years 2000-2015. The Company is also subject to non-U.S. income tax examinations for years 2007-2015.

Changes in Accumulated Other Comprehensive Loss by Component

6 Months Ended

Jun. 30, 2016

Changes in Accumulated Other Comprehensive Loss by Component

12.

Changes in Accumulated Other Comprehensive Loss by Component

Changes to accumulated other comprehensive loss by component are as follows:



	Three Months Ended June 30,
(dollars in millions)	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(30.8	)	$	(6.0	)
Other comprehensive loss before reclassifications		(17.1	)		(0.9	)

Balance at end of period		(47.9	)		(6.9	)

Unrealized net gain (loss) on cash flow derivatives
Balance at beginning of period		(0.8	)		2.1
Other comprehensive loss before reclassifications		(0.1	)		(0.5	)
Realized (gains) losses on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.4) and $0.5 in 2016 and 2015, respectively)		0.6			(0.7	)

Balance at end of period		(0.3	)		0.9

Pension liability
Balance at beginning of period		(272.7	)		(273.7	)
Other comprehensive (loss) income before reclassifications		(5.2	)		0.6
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		2.6			3.1

Balance at end of period		(275.3	)		(270.0	)

Accumulated other comprehensive loss, end of period	$	(323.5	)	$	(276.0	)

⁽¹⁾	Amortization of pension items:


Actuarial losses	$	4.5	⁽²⁾	$	5.3	⁽²⁾
Prior year service cost		(0.2	)⁽²⁾		(0.2	)⁽²⁾

		4.3			5.1
Income tax benefit		(1.7	)		(2.0	)

Reclassification net of income tax benefit	$	2.6		$	3.1

⁽²⁾	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 7 - Pensions for additional details

Changes to accumulated other comprehensive loss by component are as follows:



	Six Months Ended June 30,
(dollars in millions)	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(39.4	)	$	3.3
Other comprehensive loss before reclassifications		(8.5	)		(10.2	)

Balance at end of period		(47.9	)		(6.9	)

Unrealized net gain on cash flow derivatives
Balance at beginning of period		1.2			0.9
Other comprehensive (loss) income before reclassifications		(1.9	)		1.6
Realized losses (gains) on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.3) and $1.0 in 2016 and 2015, respectively)		0.4			(1.6	)

Balance at end of period		(0.3	)		0.9

Pension liability
Balance at beginning of period		(275.2	)		(276.2	)
Other comprehensive (loss) income before reclassifications		(5.2	)		0.7
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		5.1			5.5

Balance at end of period		(275.3	)		(270.0	)

Accumulated other comprehensive loss, end of period	$	(323.5	)	$	(276.0	)

⁽¹⁾	Amortization of pension items:


Actuarial losses	$	8.8	⁽²⁾	$	9.5	⁽²⁾
Prior year service cost		(0.5	)⁽²⁾		(0.5	)⁽²⁾

		8.3			9.0
Income tax benefit		(3.2	)		(3.5	)

Reclassification net of income tax benefit	$	5.1		$	5.5

⁽²⁾	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 7 - 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Subsequent Event

6 Months Ended

Jun. 30, 2016

Subsequent Event

13.

Subsequent Event

On August 8, 2016, the Company purchased 100 percent of the stock of the parent company of Aquasana, a water filtration company based in Austin, Texas, for $87 million.

Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2016

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Inventories (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Inventories

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


(dollars in millions)	June 30, 2016			December 31, 2015
Finished products	$	101.3		$	85.7
Work in process		12.2			13.4
Raw materials		134.0			139.6

Inventories, at FIFO cost		247.5			238.7
LIFO reserve		(9.7	)		(15.8	)

Net inventory	$	237.8		$	222.9

Product Warranties (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Product Warranty Liability Activity

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


	Three Months Ended June 30,
(dollars in millions)	2016			2015
Balance at April 1,	$	140.6		$	137.2
Expense		16.0			15.3
Claims settled		(15.1	)		(14.2	)

Balance at June 30,	$	141.5		$	138.3


	Six Months Ended June 30,
(dollars in millions)	2016			2015
Balance at January 1,	$	139.4		$	136.2
Expense		32.3			32.5
Claims settled		(30.2	)		(30.4	)

Balance at June 30,	$	141.5		$	138.3

Earnings per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Computation of Basic and Diluted Weighted Average Shares Used in EPS 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 June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Denominator for basic earnings per share – weighted average shares		87,480,860		89,139,114		87,663,931		89,286,984
Effect of dilutive stock options and share units		1,018,500		686,041		1,038,392		708,193

Denominator for diluted earnings per share		88,499,360		89,825,155		88,702,323		89,995,177

Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Changes in Option Shares

Changes in option awards, all of which relate to Common Stock, were as follows for the six months ended June 30, 2016:


	Weighted-Avg. Per Share Exercise Price		Number of Options			Average Remaining Contractual Life		Aggregate Intrinsic Value (dollars in millions)
Outstanding at January 1, 2016	$	36.05		1,326,779
Granted		63.06		266,885
Exercised		27.04		(231,602	)
Forfeited		56.38		(1,533	)

Outstanding at June 30, 2016		42.86		1,360,529			7 years	$	61.6

Exercisable at June 30, 2016	$	32.40		834,556			6 years	$	46.5

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


	Six Months Ended June 30,
	2016			2015
Expected life (years)		5.8			5.9
Risk-free interest rate		1.7	%		2.0	%
Dividend yield		1.3	%		1.0	%
Expected volatility		27.8	%		29.3	%

Schedule of Share Unit Activity Under Plan

A summary of share unit activity under the Plan for the six months ended June 30, 2016:


	Number of Units			Weighted-Average Grant Date Value
Issued and unvested at January 1, 2016		329,262		$	44.30
Granted		77,740			63.47
Vested		(132,953	)		34.71
Forfeited		(1,030	)		59.17

Issued and unvested at June 30, 2016		273,019		$	54.59

Pensions (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Components of Net Pension Expense

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


	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in millions)	2016			2015			2016			2015
Service cost	$	0.4		$	0.5		$	0.9		$	1.0
Interest cost		7.7			9.4			15.3			18.8
Expected return on plan assets		(13.8	)		(14.5	)		(27.6	)		(28.8	)
Amortization of unrecognized loss		4.5			4.8			8.8			9.5
Amortization of prior service cost		(0.2	)		(0.2	)		(0.5	)		(0.5	)

Defined benefit plan income	$	(1.4	)	$	—		$	(3.1	)	$	—

Operations by Segment (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Operating Earnings



	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in millions)	2016			2015			2016			2015
Net sales
North America	$	432.8		$	442.7		$	856.7		$	871.9
Rest of World		239.8			221.3			457.3			417.2
Inter-segment sales		(5.6	)		(10.5	)		(10.1	)		(17.1	)

	$	667.0		$	653.5		$	1,303.9		$	1,272.0

Operating earnings
North America	$	104.2		$	86.0		$	196.1		$	157.2
Rest of World		33.0			30.9			59.8			57.1

		137.2			116.9			255.9			214.3

Corporate expense		(11.2	)		(11.2	)		(24.6	)		(23.9	)
Interest expense		(1.9	)		(2.5	)		(3.6	)		(4.4	)

Earnings before income taxes		124.1			103.2			227.7			186.0
Provision for income taxes		37.0			32.1			67.1			56.5

Net earnings	$	87.1		$	71.1		$	160.6		$	129.5

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Assets Measured at Fair Value on Recurring Basis

The following table presents assets measured at fair value on a recurring basis:


(dollars in millions)
Fair Value Measurement Using	June 30, 2016			December 31, 2015
Quoted prices in active markets for identical assets (Level 1)	$	379.6		$	323.9
Significant other observable inputs (Level 2)		(0.1	)		(0.3	)

Total assets measured at fair value	$	379.5		$	323.6

Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Effect of Derivatives Designated as Hedging Instruments on Statement of Earnings

The effect of derivatives designated as hedging instruments on the statement of earnings is as follows:


Three Months Ended June 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)		Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)					Location of gain (loss) recognized in earnings on derivative (ineffective portion)		Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015					2016			2015				2016		2015
Foreign currency contracts	$	(1.1	)	$	(0.8	)		Cost of products sold	$	(1.0	)	$	1.2		N/A	$	—	$	—
Commodities contracts		0.8			(0.1	)		Cost of products sold		—			—		Cost of products sold		—		0.1

	$	(0.3	)	$	(0.9	)			$	(1.0	)	$	1.2			$	—	$	0.1


Six Months Ended June 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)		Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)						Location of gain (loss) recognized in earnings on derivative (ineffective portion)		Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015					2016			2015					2016		2015
Foreign currency contracts	$	(4.8	)	$	2.7			Cost of products sold	$	(0.7	)	$	2.7			N/A	$	—	$	—
Commodities contracts		1.7			(0.3	)		Cost of products sold		—			(0.1	)		Cost of products sold		—		—

	$	(3.1	)	$	2.4				$	(0.7	)	$	2.6				$	—	$	—

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.



	June 30,
(dollars in millions)	2016				2015
	Buy		Sell		Buy		Sell
British pound	$	—	$	0.5	$	—	$	0.5
Canadian dollar		—		62.7		—		66.7
Euro		12.9		0.9		18.4		0.5
Mexican peso		13.2		—		13.6		—

Total	$	26.1	$	64.1	$	32.0	$	67.7

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

The following tables present the impact of derivative contracts on the Company’s financial statements.

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



(dollars in millions)	Balance Sheet Location	June 30, 2016			December 31, 2015
Foreign currency contracts	Other current assets	$	0.7		$	3.6
	Accrued liabilities		(2.5	)		(1.3	)
Commodities contracts	Other current assets		1.5			—
	Accrued liabilities		(0.1	)		(0.3	)

Total derivatives designated as hedging instruments		$	(0.4	)	$	2.0

Changes in Accumulated Other Comprehensive Loss by Component (Tables)

6 Months Ended

Jun. 30, 2016

Changes to Accumulated Other Comprehensive Loss by Component

Changes to accumulated other comprehensive loss by component are as follows:



	Three Months Ended June 30,
(dollars in millions)	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(30.8	)	$	(6.0	)
Other comprehensive loss before reclassifications		(17.1	)		(0.9	)

Balance at end of period		(47.9	)		(6.9	)

Unrealized net gain (loss) on cash flow derivatives
Balance at beginning of period		(0.8	)		2.1
Other comprehensive loss before reclassifications		(0.1	)		(0.5	)
Realized (gains) losses on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.4) and $0.5 in 2016 and 2015, respectively)		0.6			(0.7	)

Balance at end of period		(0.3	)		0.9

Pension liability
Balance at beginning of period		(272.7	)		(273.7	)
Other comprehensive (loss) income before reclassifications		(5.2	)		0.6
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		2.6			3.1

Balance at end of period		(275.3	)		(270.0	)

Accumulated other comprehensive loss, end of period	$	(323.5	)	$	(276.0	)

⁽¹⁾	Amortization of pension items:


Actuarial losses	$	4.5	⁽²⁾	$	5.3	⁽²⁾
Prior year service cost		(0.2	)⁽²⁾		(0.2	)⁽²⁾

		4.3			5.1
Income tax benefit		(1.7	)		(2.0	)

Reclassification net of income tax benefit	$	2.6		$	3.1

⁽²⁾	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 7 - Pensions for additional details

Changes to accumulated other comprehensive loss by component are as follows:



	Six Months Ended June 30,
(dollars in millions)	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(39.4	)	$	3.3
Other comprehensive loss before reclassifications		(8.5	)		(10.2	)

Balance at end of period		(47.9	)		(6.9	)

Unrealized net gain on cash flow derivatives
Balance at beginning of period		1.2			0.9
Other comprehensive (loss) income before reclassifications		(1.9	)		1.6
Realized losses (gains) on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.3) and $1.0 in 2016 and 2015, respectively)		0.4			(1.6	)

Balance at end of period		(0.3	)		0.9

Pension liability
Balance at beginning of period		(275.2	)		(276.2	)
Other comprehensive (loss) income before reclassifications		(5.2	)		0.7
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		5.1			5.5

Balance at end of period		(275.3	)		(270.0	)

Accumulated other comprehensive loss, end of period	$	(323.5	)	$	(276.0	)

⁽¹⁾	Amortization of pension items:


Actuarial losses	$	8.8	⁽²⁾	$	9.5	⁽²⁾
Prior year service cost		(0.5	)⁽²⁾		(0.5	)⁽²⁾

		8.3			9.0
Income tax benefit		(3.2	)		(3.5	)

Reclassification net of income tax benefit	$	5.1		$	5.5

⁽²⁾	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 7 - Pensions for additional details

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Disclosure Basis Of Presentation Details [Line Items]
Recent accounting pronouncement, discrete income tax benefits associated with excess tax benefits on settled stock based compensation awards	$ 2.9	$ 5.4
Recent accounting pronouncement, cash paid when shares directly withheld for employee income tax withholding purposes classified as financing activities in statements of cash flows			$ (3.0)
Recent accounting pronouncement effect on operating activities, cash paid when shares directly withheld for employee income tax withholding purposes classified as financing activities in statements of cash flows			$ 3.0
Recent accounting pronouncement, deferred tax assets and liabilities classified as noncurrent				$ 40.5
Recent accounting pronouncement effect on deferred tax asset current, deferred tax assets and liabilities classified as noncurrent				$ (40.5)

Schedule of Inventories (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Inventories
Finished products	$ 101.3	$ 85.7
Work in process	12.2	13.4
Raw materials	134.0	139.6
Inventories, at FIFO cost	247.5	238.7
LIFO reserve	(9.7)	(15.8)
Net inventory	$ 237.8	$ 222.9

Company's Warranty Liability Activity (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Product Warranties
Balance at beginning of year	$ 140.6	$ 137.2	$ 139.4	$ 136.2
Expense	16.0	15.3	32.3	32.5
Claims settled	(15.1)	(14.2)	(30.2)	(30.4)
Balance at end of year	$ 141.5	$ 138.3	$ 141.5	$ 138.3

Long-Term Debt - Additional Information (Detail)		6 Months Ended
Long-Term Debt - Additional Information (Detail)	Jan. 15, 2015 USD ($)	Jun. 30, 2016 USD ($) lender
Debt Instrument [Line Items]
Multi-currency revolving credit agreement		$ 400,000,000
Number of banks involved in multi-year multi-currency revolving credit agreement \| lender		8
Revolving credit facility, expiration date		Dec. 12, 2017
Multi-currency revolving credit agreement, maximum amount		$ 500,000,000
Term Notes With Insurance Companies
Debt Instrument [Line Items]
Debt instrument, issued	$ 75,000,000
Debt instrument, principle repayment commencement year	2020
Debt instrument, interest rate	3.52%
Debt instrument, maturity year	2030

Schedule of Computation of Basic and Diluted Weighted-Average Shares Used in Earnings per Share Calculations (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share Of Common Stock
Denominator for basic earnings per share - weighted average shares	87,480,860	89,139,114	87,663,931	89,286,984
Effect of dilutive stock options and share units	1,018,500	686,041	1,038,392	708,193
Denominator for diluted earnings per share	88,499,360	89,825,155	88,702,323	89,995,177

Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation cost recognized	$ 1.8	$ 1.1	$ 6.9	$ 6.8
Stock option compensation recognized	$ 0.9	$ 0.5	$ 3.4	$ 3.1
Weighted-average fair value per option at the date of grant			$ 15.78	$ 17.17
Number of Options, outstanding	1,360,529		1,360,529		1,326,779
Number of options, exercisable at end of period	834,556		834,556
Number of options, exercised			231,602
Number of options, forfeited			1,533
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years	3 years
Award expiration period			10 years	10 years
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Award expiration period			10 years
Number of Options, granted			0	12,470
Number of Options, outstanding	13,115		13,115
Number of options, exercisable at end of period	4,163		4,163
Number of options, exercised			215
Number of options, forfeited			430
Restricted Stock And Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years	3 years	3 years	3 years
Number of Units - Granted			77,740	76,035
Value of share units at the date of issuance			$ 4.9	$ 4.7
Share based compensation expense attributable to share units	$ 0.6	$ 0.9	$ 3.5	$ 3.7
A.O. Smith Combined Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for granting of options, restricted stock or share units	1,644,845		1,644,845

Changes in Option Awards All of Which Related to Common Stock (Detail) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Per Share Exercise Price, beginning period \| $ / shares	$ 36.05
Weighted-Average Per Share Exercise Price - Granted \| $ / shares	63.06
Weighted-Average Per Share Exercise Price - Exercised \| $ / shares	27.04
Weighted-Average Per Share Exercise Price - Forfeited \| $ / shares	56.38
Weighted-Average Per Share Exercise Price, ending period \| $ / shares	42.86
Weighted-Average Per Share Exercise Price, Exercisable \| $ / shares	$ 32.40
Number of Options Outstanding, Beginning Balance \| shares	1,326,779
Number of Options, Granted \| shares	266,885
Number of Options, Exercised \| shares	(231,602)
Number of Options, Forfeited \| shares	(1,533)
Number of Options Outstanding, Ending Balance \| shares	1,360,529
Number of options, exercisable at end of period \| shares	834,556
Average Remaining Contractual Life, Outstanding at End of Period, Years	7 years
Average Remaining Contractual Life, Exercisable at End of Period, Years	6 years
Aggregate Intrinsic Value, Outstanding at End of Period \| $	$ 61.6
Aggregate Intrinsic Value, Exercisable at End of Period \| $	$ 46.5

Schedule of Weighted-Average Fair Value per Option at Date of Grant (Detail)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Stock Based Compensation [Abstract]
Expected life (years)	5 years 9 months 18 days	5 years 10 months 24 days
Risk-free interest rate	1.70%	2.00%
Dividend yield	1.30%	1.00%
Expected volatility	27.80%	29.30%

Summary of Share Unit Activity Under Plan (Detail) - Restricted Stock And Share Units - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units Issued and unvested, Beginning of Period	329,262
Number of Units - Granted	77,740	76,035
Number of Units - Vested	(132,953)
Number of Units - Forfeited	(1,030)
Number of Units Issued and unvested, End of Period	273,019
Weighted-Average Grant Date Value, Beginning of Period	$ 44.30
Weighted-Average Grant Date Value - Granted	63.47
Weighted-Average Grant Date Value - Vested	34.71
Weighted-Average Grant Date Value - Forfeited	59.17
Weighted-Average Grant Date Value, End of Period	$ 54.59

Components of Company's Net Pension Expense (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pensions [Abstract]
Service cost	$ 0.4	$ 0.5	$ 0.9	$ 1.0
Interest cost	7.7	9.4	15.3	18.8
Expected return on plan assets	(13.8)	(14.5)	(27.6)	(28.8)
Amortization of unrecognized loss	4.5	4.8	8.8	9.5
Amortization of prior service cost	(0.2)	$ (0.2)	(0.5)	$ (0.5)
Defined benefit plan income	$ (1.4)		$ (3.1)

Pensions - Additional Information (Detail) $ in Millions	3 Months Ended
Pensions - Additional Information (Detail) $ in Millions	Jun. 30, 2016 USD ($)
United States Pension Plan of US Entity
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntary pension contribution	$ 30

Operations by Segment - Additional Information (Detail)	6 Months Ended
Operations by Segment - Additional Information (Detail)	Jun. 30, 2016 Segment
Segment Reporting Information [Line Items]
Number of reporting segments	2

Schedule of Operating Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 667.0	$ 653.5	$ 1,303.9	$ 1,272.0
Operating earnings	137.2	116.9	255.9	214.3
Other income (expense)	2.3	2.7	4.3	5.4
Interest expense	(1.9)	(2.5)	(3.6)	(4.4)
Earnings before income taxes	124.1	103.2	227.7	186.0
Provision for income taxes	37.0	32.1	67.1	56.5
Net earnings	87.1	71.1	160.6	129.5
Inter-segment
Segment Reporting Information [Line Items]
Net sales	(5.6)	(10.5)	(10.1)	(17.1)
Corporate
Segment Reporting Information [Line Items]
Other income (expense)	(11.2)	(11.2)	(24.6)	(23.9)
North America \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	432.8	442.7	856.7	871.9
Operating earnings	104.2	86.0	196.1	157.2
Rest of World \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	239.8	221.3	457.3	417.2
Operating earnings	$ 33.0	$ 30.9	$ 59.8	$ 57.1

Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on recurring basis	$ 379.5	$ 323.6
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 on recurring basis	379.6	323.9
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on recurring basis	$ (0.1)	$ (0.3)

Schedule of Summary by Currency of Foreign Currency Forward Contracts (Detail) - Foreign currency forward contracts - USD ($)	Jun. 30, 2016	Jun. 30, 2015
Buy
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	$ 26,100,000	$ 32,000,000
Buy \| Euro
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	12,900,000	18,400,000
Buy \| Mexican peso
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	13,200,000	13,600,000
Sell
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	64,100,000	67,700,000
Sell \| British pound
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	500,000	500,000
Sell \| Canadian dollar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	62,700,000	66,700,000
Sell \| Euro
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	$ 900,000	$ 500,000

Derivative Instruments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016
Commodity Futures Contracts
Trading Activity, Gains and Losses, Net [Line Items]
Reclassification period for effective portion of contract, in years	1 year

Impact of Derivative Contracts on Company's Financial Statements (Detail) - Designated as Hedging Instrument - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ (0.4)	$ 2.0
Foreign Currency Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	0.7	3.6
Foreign Currency Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(2.5)	(1.3)
Commodities Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	1.5
Commodities Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	$ (0.1)	$ (0.3)

Effect of Derivatives Designated as Hedging Instruments on Statement of Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	$ (0.3)	$ (0.9)	$ (3.1)	$ 2.4
Amount of gain/(loss) reclassified from accumulated OCI into earnings (effective portion)	(1.0)	1.2	(0.7)	2.6
Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)		0.1
Foreign Currency Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	(1.1)	(0.8)	(4.8)	2.7
Foreign Currency Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from accumulated OCI into earnings (effective portion)	(1.0)	1.2	(0.7)	2.7
Commodities Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	$ 0.8	(0.1)	$ 1.7	(0.3)
Commodities Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from accumulated OCI into earnings (effective portion)				$ (0.1)
Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)		$ 0.1

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Effective tax rates	29.80%	31.10%	29.50%	30.40%		29.70%
Unrecognized tax benefits	$ 2.6		$ 2.6
Unrecognized tax benefits that would affect the effective tax rate, if recognized	$ 0.5		$ 0.5
Earliest Tax Year \| U.S. federal
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2014
Latest Tax Year \| U.S. federal
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2015
State and local \| Earliest Tax Year
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2000
State and local \| Latest Tax Year
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2015
Non-U.S. \| Earliest Tax Year
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2007
Non-U.S. \| Latest Tax Year
Income Tax Contingency [Line Items]
Income tax examinations, years under examination			2015
Scenario, Forecast
Income Tax Contingency [Line Items]
Effective tax rates					30.00%

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

3 Months Ended

6 Months Ended

Jun. 30, 2016

Jun. 30, 2015

Jun. 30, 2016

Jun. 30, 2015

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

$ 1,442.3

Ending balance

$ 1,480.7

1,480.7

Cumulative foreign currency translation

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(30.8)

$ (6.0)

(39.4)

$ 3.3

Other comprehensive (loss) income before reclassifications

(17.1)

(0.9)

(8.5)

(10.2)

Ending balance

(47.9)

(6.9)

(47.9)

(6.9)

Unrealized net gain (loss) on cash flow derivatives

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(0.8)

2.1

1.2

0.9

Other comprehensive (loss) income before reclassifications

(0.1)

(0.5)

(1.9)

1.6

Realized (gains) losses on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.4), $0.5 in 03 months ended June 30, 2016 and 2015 respectively and $(0.3), $1.0 in 06 months ended June 30, 2016 and 2015 respectively)

0.6

(0.7)

0.4

(1.6)

Ending balance

(0.3)

0.9

(0.3)

0.9

Pension liability

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(272.7)

(273.7)

(275.2)

(276.2)

Other comprehensive (loss) income before reclassifications

(5.2)

0.6

(5.2)

0.7

Amounts reclassified from accumulated other comprehensive loss

2.6

^[1]

3.1

^[1]

5.1

^[2]

5.5

^[2]

Ending balance

(275.3)

(270.0)

(275.3)

(270.0)

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Ending balance

$ (323.5)

$ (276.0)

$ (323.5)

$ (276.0)

[1]	Amortization of pension items: Actuarial losses $ 4.5 (2) $ 5.3 (2) Prior year service cost (0.2 )(2) (0.2 )(2) 4.3 5.1 Income tax benefit (1.7 ) (2.0 ) Reclassification net of income tax benefit $ 2.6 $ 3.1
[2]	Amortization of pension items: Actuarial losses $ 8.8 (2) $ 9.5 (2) Prior year service cost (0.5 )(2) (0.5 )(2) 8.3 9.0 Income tax benefit (3.2 ) (3.5 ) Reclassification net of income tax benefit $ 5.1 $ 5.5

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

3 Months Ended

6 Months Ended

Jun. 30, 2016

Jun. 30, 2015

Jun. 30, 2016

Jun. 30, 2015

Unrealized net gain (loss) on cash flow derivatives

Accumulated Other Comprehensive Income (Loss) [Line Items]

Realized losses (gains) on derivatives reclassified to cost of products sold, tax (benefit)provision

$ (0.4)

$ 0.5

$ (0.3)

$ 1.0

Pension liability

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification, before income tax benefit

4.3

5.1

8.3

9.0

Income tax benefit

(1.7)

(2.0)

(3.2)

(3.5)

Reclassification net of income tax benefit

2.6

^[1]

3.1

^[1]

5.1

^[2]

5.5

^[2]

Actuarial losses

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification, before income tax benefit

^[3]

4.5

5.3

8.8

9.5

Prior year service cost

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification, before income tax benefit

^[3]

$ (0.2)

$ (0.5)

[1]	Amortization of pension items: Actuarial losses $ 4.5 (2) $ 5.3 (2) Prior year service cost (0.2 )(2) (0.2 )(2) 4.3 5.1 Income tax benefit (1.7 ) (2.0 ) Reclassification net of income tax benefit $ 2.6 $ 3.1
[2]	Amortization of pension items: Actuarial losses $ 8.8 (2) $ 9.5 (2) Prior year service cost (0.5 )(2) (0.5 )(2) 8.3 9.0 Income tax benefit (3.2 ) (3.5 ) Reclassification net of income tax benefit $ 5.1 $ 5.5
[3]	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 7 - Pensions for additional details

Subsequent Event - Additional Information (Detail) - Aquasana - Subsequent Event $ in Millions	Aug. 08, 2016 USD ($)
Subsequent Event [Line Items]
Percentage of ownership interest acquired	100.00%
Total purchase price consideration	$ 87