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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2016	Oct. 31, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	AOS
Entity Registrant Name	SMITH A O CORP
Entity Central Index Key	0000091142
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		26,213,695
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		147,699,519

CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net sales	$ 683.9	$ 625.1	$ 1,987.8	$ 1,897.1
Cost of products sold	400.6	369.5	1,158.1	1,149.9
Gross profit	283.3	255.6	829.7	747.2
Selling, general and administrative expenses	164.7	149.0	484.1	455.6
Interest expense	2.1	1.6	5.7	6.0
Other income	(1.9)	(2.2)	(6.2)	(7.6)
Earnings before income taxes	118.4	107.2	346.1	293.2
Provision for income taxes	35.2	33.6	102.3	90.1
Net Earnings	$ 83.2	$ 73.6	$ 243.8	$ 203.1
Net Earnings Per Share of Common Stock	$ 0.48	$ 0.41	$ 1.39	$ 1.14
Diluted Net Earnings Per Share of Common Stock	0.47	0.41	1.38	1.13
Dividends Per Share of Common Stock	$ 0.120	$ 0.095	$ 0.360	$ 0.285

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net earnings	$ 83.2	$ 73.6	$ 243.8	$ 203.1
Other comprehensive (loss) earnings
Foreign currency translation adjustments	(3.5)	(17.8)	(12.0)	(28.0)
Unrealized net (losses) gains on cash flow derivative instruments, less related income tax benefit (provision) of $0.2 and $1.1 in 2016, $(0.4) and $(0.4) in 2015	(0.2)	0.6	(1.7)	0.6
Adjustment to pension liability, less related income tax provision of $(1.6) and $(1.5) in 2016 and $(1.8) and $(5.7) in 2015	2.4	2.7	2.3	8.9
Comprehensive Earnings	$ 81.9	$ 59.1	$ 232.4	$ 184.6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Unrealized net (losses)gains on cash flow derivative instruments, related income tax benefit (provision)	$ 0.2	$ (0.4)	$ 1.1	$ (0.4)
Adjustment to pension liability, related income tax provision	$ (1.6)	$ (1.8)	$ (1.5)	$ (5.7)

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 269.3	$ 323.6
Marketable securities	409.5	321.6
Receivables	517.3	501.4
Inventories	258.6	222.9
Other current assets	52.9	45.9
Total Current Assets	1,507.6	1,415.4
Property, plant and equipment	919.8	866.8
Less accumulated depreciation	(461.4)	(424.1)
Net property, plant and equipment	458.4	442.7
Goodwill	491.8	420.9
Other intangibles	311.8	291.0
Other assets	54.8	59.2
Total Assets	2,824.4	2,629.2
Liabilities
Trade payables	455.8	424.9
Accrued payroll and benefits	76.8	81.6
Accrued liabilities	97.6	90.1
Product warranties	44.6	43.7
Debt due within one year	7.3	12.9
Total Current Liabilities	682.1	653.2
Long-term debt	328.9	236.1
Pension liabilities	95.2	134.2
Other liabilities	192.6	163.4
Total Liabilities	1,298.8	1,186.9
Stockholders' Equity
Common Stock, value	164.4	164.4
Capital in excess of par value	476.1	469.3
Retained earnings	1,531.2	1,350.7
Accumulated other comprehensive loss	(324.8)	(313.4)
Treasury stock at cost	(453.1)	(360.5)
Total Stockholders' Equity	1,525.6	1,442.3
Total Liabilities and Stockholders' Equity	2,824.4	2,629.2
Common Class A
Stockholders' Equity
Common Stock, value	$ 131.8	$ 131.8

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Common Stock, par value	$ 1	$ 1
Common Stock, shares authorized	240,000,000	240,000,000
Common Stock, shares issued	164,357,392	164,334,196
Common Class A
Common Stock, par value	$ 5	$ 5
Common Stock, shares authorized	27,000,000	27,000,000
Common Stock, shares issued	26,350,200	26,373,396

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net earnings	$ 243.8	$ 203.1
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:
Depreciation and amortization	48.7	47.3
Pension (income) expense	(4.8)	0.1
Stock based compensation expense	8.1	7.8
Net changes in operating assets and liabilities, net of acquisitions:
Current assets and liabilities	(23.5)	(6.4)
Noncurrent assets and liabilities	(7.8)	(13.8)
Cash Provided by Operating Activities - continuing operations	264.5	238.1
Cash Used in Operating Activities - discontinued operations	(0.9)	(1.0)
Cash Provided by Operating Activities	263.6	237.1
Investing Activities
Capital expenditures	(58.7)	(53.1)
Acquisitions	(90.5)
Investments in marketable securities	(415.5)	(322.2)
Net proceeds from sale of marketable securities	318.2	213.8
Cash Used in Investing Activities	(246.5)	(161.5)
Financing Activities
Term debt (repaid) incurred	(13.2)	61.7
Long-term debt incurred (repaid)	99.7	(22.4)
Common stock repurchases	(100.2)	(104.3)
Net proceeds from stock option activity	5.5	3.8
Dividends paid	(63.2)	(50.9)
Cash Used in Financing Activities	(71.4)	(112.1)
Net decrease in cash and cash equivalents	(54.3)	(36.5)
Cash and cash equivalents - beginning of period	323.6	319.4
Cash and Cash Equivalents - End of Period	$ 269.3	$ 282.9

Basis of Presentation

9 Months Ended

Sep. 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 nine months ended September 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.

On April 11, 2016, the Company’s stockholders approved a proposal to increase the Company’s authorized shares of Common Stock and on September 7, 2016, 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 100 percent stock dividend to stockholders of record on September 21, 2016 and payable on October 5, 2016. All references in the financial statements and footnotes to the number of shares outstanding, price per share amounts, and stock-based compensation data have been recast to reflect the split for all periods presented.

Certain other prior period amounts have been reclassified to conform to the 2016 presentation.

Recent Accounting Pronouncements

In August 2016, the Financial Accounting Standards Board (FASB) amended Accounting Standard Codification (ASC) 230, Statement of Cash Flows (issued under Accounting Standards Update (ASU) 2016-15, “Clarification of Certain Cash Receipts and Cash Payments.”) This amendment clarifies reporting for contingent consideration payments made after a business combination depending on how soon after the acquisition the payments are made. The amendment requires adoption for periods beginning January 1, 2018 and permits early adoption. The Company is in the process of determining whether the adoption of ASU 2016-15 will have a material impact on its consolidated statements of cash flows.

In March 2016, the FASB amended ASC 718, Compensation - Stock Compensation (issued under 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 benefits or expense in the Consolidated Statement of Earnings in the periods in which they occur. The amendment also eliminated previous guidance that required unrecognized future excess income tax benefits to be considered 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 applied this guidance prospectively. As such, in the three months and nine months ended September 30, 2016, the Company recognized $0.2 million and $5.6 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 nine months ended September 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 consolidated statements of cash flows. As required, the Company applied this guidance retrospectively in the presentation of the consolidated statements of cash flows for the period beginning January 1, 2015 and, as a result, reclassified $5.8 million of cash used by operating activities to cash used by financing activities for the nine months ended September 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, consolidated statements of earnings or consolidated 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 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, consolidated statements of earnings or consolidated 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, consolidated statements of earnings or consolidated statements of cash flows.

Acquisitions

9 Months Ended

Sep. 30, 2016

Acquisitions

2.	Acquisitions

On August 8, 2016, the Company acquired 100 percent of the shares of Aquasana, Inc. (Aquasana), a Texas-based water treatment company. With the addition of Aquasana, the Company entered the U.S. water treatment market. Aquasana is included in the Company’s North America segment for reporting purposes.

The Company paid an aggregate cash purchase price of $84.8 million, net of $1.9 million of cash acquired. In addition, the Company incurred acquisition-related costs of approximately $1.2 million.

The following table summarizes the preliminary estimate of fair value of the assets acquired and liabilities assumed at the date of acquisition for purposes of allocating the purchase price. The Company is in the process of finalizing the fair value estimates, therefore the allocation of the purchase price is subject to refinement. Of the preliminary $30.0 million of acquired intangible assets, $21.5 million was assigned to trade names that are not subject to amortization, $8.3 million was assigned to customer relationships which will be amortized over ten years and the remaining $0.2 million was assigned to patents which will be amortized over three years.


August 8, 2016 (dollars in millions)
Current assets, net of cash acquired	$	7.3
Property, plant and equipment		2.7
Intangible assets		30.0
Goodwill		59.5

Total assets acquired		99.5
Current liabilities		(5.0	)
Long-term liabilities		(9.7	)

Total liabilities assumed		(14.7	)

Net assets acquired	$	84.8

The acquisition was accounted for using the purchase method of accounting, and accordingly, the results of operations have been included in the Company’s financial statements from August 8, 2016, the date of acquisition. Revenues and pre-tax loss associated with Aquasana included in the consolidated statement of earnings totaled $6.2 million and $(1.2) million, respectively which included $0.2 million of operating earnings less $1.2 million of acquisition-related costs and $0.2 of interest expense incurred by the Company resulting from the acquisition.

On August 26, 2016, the Company acquired certain assets, primarily inventory, of a small electric water heater manufacturer serving the North America market. The Company paid $5.7 million for the assets. Under the purchase agreement, the Company agreed to make additional contingent payments for the acquired assets if certain conditions are met over the next ten years. As of the acquisition date, the Company estimated the fair value of the contingent payments at $5.2 million and recorded a liability for the contingent consideration.

- 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

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+ Details

Inventories

9 Months Ended

Sep. 30, 2016

Inventories

3.	Inventories

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


(dollars in millions)
	September 30, 2016			December 31, 2015
Finished products	$	118.0		$	85.7
Work in process		12.0			13.4
Raw materials		138.3			139.6

Inventories, at FIFO cost		268.3			238.7
LIFO reserve		(9.7	)		(15.8	)

Net inventory	$	258.6		$	222.9

Product Warranties

9 Months Ended

Sep. 30, 2016

Product Warranties

4.	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 September 30,
(dollars in millions)	2016			2015
Balance at July 1,	$	141.5		$	138.3
Expense		10.4			11.7
Claims settled		(8.9	)		(11.2	)

Balance at September 30,	$	143.0		$	138.8


	Nine Months Ended September 30,
(dollars in millions)	2016			2015
Balance at January 1,	$	139.4		$	136.2
Expense		35.0			38.1
Claims settled		(31.4	)		(35.5	)

Balance at September 30,	$	143.0		$	138.8

Long-Term Debt

9 Months Ended

Sep. 30, 2016

Long-Term Debt

5.	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 September 30, 2016.

Earnings per Share of Common Stock

9 Months Ended

Sep. 30, 2016

Earnings per Share of Common Stock

6.	Earnings per Share of Common Stock

The numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Denominator for basic earnings per share - weighted average shares		174,409,789		177,396,392		175,019,605		178,177,130
Effect of dilutive stock options and share units		2,138,589		1,342,756		2,097,444		1,391,714

Denominator for diluted earnings per share		176,548,378		178,739,148		177,117,049		179,568,844

Stock Based Compensation

9 Months Ended

Sep. 30, 2016

Stock Based Compensation

7.	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 September 30, 2016 was 3,268,580. 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 September 30, 2016 and 2015 was $1.2 million and $1.0 million, respectively. Total stock based compensation expense recognized in the nine months ended September 30, 2016 and 2015 was $8.1 million and $7.8 million, respectively.

Stock Options

The stock options granted in the nine months ended September 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 nine months ended September 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 September 30, 2016 and 2015 was $0.5 million and $0.5 million, respectively. Stock based compensation expense attributable to stock options in the nine months ended September 30, 2016 and 2015 was $3.9 million and $3.6 million, respectively.

Changes in option awards, all of which relate to Common Stock, were as follows for the nine months ended September 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	$	18.03		2,653,558
Granted		32.08		553,370
Exercised		14.01		(508,022	)
Forfeited		28.99		(5,762	)

Outstanding at September 30, 2016		21.64		2,693,144			7 years	$	73.8

Exercisable at September 30, 2016	$	16.11		1,626,562			6 years	$	53.6

The weighted-average fair value per option at the date of grant during the nine months ended September 30, 2016 and 2015 using the Black-Scholes option-pricing model was $8.03 and $8.58, respectively. Assumptions were as follows:


	Nine Months Ended September 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		27.7	%		29.3	%

The expected lives of options for purposes of these models are based on historical exercise behaviors. The risk-free interest rates for purposes of these models are based on the U.S. Treasury yield curves in effect on the dates of grant for the respective expected lives of the options. The expected dividend yields for purposes of these models are based on the dividends paid on Common Stock in the preceding four quarters divided by the grant date market value of the Common Stock. The expected volatility for purposes of these models are based on the historical volatility of the 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 September 30, 2016, there were 24,940 SARs outstanding and 8,320 were exercisable. In the nine months ended September 30, 2016, 430 SARs were exercised and 860 SARs were forfeited. In the first nine months of 2015, the Company granted 26,230 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 160,428 and 152,070 share units under the Plan in the nine months ended September 30, 2016 and 2015, respectively. The share units were valued at $5.2 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 nine months ended September 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 $0.7 million and $0.5 million was recognized in the three months ended September 30, 2016 and 2015, respectively. Stock based compensation expense attributable to share units of $4.2 million was recognized in each of the nine month periods ended September 30, 2016 and 2015. 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 nine months ended September 30, 2016:


	Number of Units			Weighted-Average Grant Date Value
Issued and unvested at January 1, 2016		658,524		$	22.15
Granted		160,428			32.21
Vested		(268,306	)		17.39
Forfeited		(3,660	)		29.32

Issued and unvested at September 30, 2016		546,986		$	27.39

- 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

9 Months Ended

Sep. 30, 2016

Pensions

8.	Pensions

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


(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Service cost	$	0.4		$	0.5		$	1.3		$	1.5
Interest cost		7.7			9.4			23.0			28.2
Expected return on plan assets		(13.9	)		(14.3	)		(41.5	)		(43.1	)
Amortization of unrecognized loss		4.4			4.8			13.2			14.3
Amortization of prior service cost		(0.3	)		(0.3	)		(0.8	)		(0.8	)

Defined benefit plan (income) expense	$	(1.7	)	$	0.1		$	(4.8	)	$	0.1

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 made a voluntary $30 million contribution in the three months ended September 30, 2016.

Operations by Segment

9 Months Ended

Sep. 30, 2016

Operations by Segment

9.	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 as well as water treatment products. 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. The Company also manufactures and markets in-home air purification products in China. The following table presents the Company’s results of operations by segment:


(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net sales
North America	$	450.8		$	417.4		$	1,307.5		$	1,289.3
Rest of World		240.3			217.1			697.6			634.3
Inter-segment sales		(7.2	)		(9.4	)		(17.3	)		(26.5	)

	$	683.9		$	625.1		$	1,987.8		$	1,897.1

Operating earnings
North America	$	100.5		$	90.5		$	296.5		$	247.7
Rest of World		31.1			27.4			90.9			84.5

		131.6			117.9			387.4			332.2
Corporate expense		11.1			9.1			35.6			33.0
Interest expense		2.1			1.6			5.7			6.0

Earnings before income taxes		118.4			107.2			346.1			293.2
Provision for income taxes		35.2			33.6			102.3			90.1

Net earnings	$	83.2		$	73.6		$	243.8		$	203.1

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

Reference 3: 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
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Paragraph 26
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Fair Value Measurements

9 Months Ended

Sep. 30, 2016

Fair Value Measurements

10.

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	September 30, 2016		December 31, 2015
Quoted prices in active markets for identical assets (Level 1)	$	409.1	$	323.9
Significant other observable inputs (Level 2)		—		(0.3	)

Total assets measured at fair value	$	409.1	$	323.6

There were no changes in the Company’s valuation techniques used to measure fair values on a recurring basis during the nine months ended September 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

9 Months Ended

Sep. 30, 2016

Derivative Instruments

11.

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 are 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.


(dollars in millions)
	September 30,
	2016				2015
	Buy		Sell		Buy		Sell
British pound	$	—	$	0.2	$	—	$	1.1
Canadian dollar		—		77.2		—		64.9
Euro		6.7		0.5		9.2		1.9
Mexican peso		13.8		—		16.9		—

Total	$	20.5	$	77.9	$	26.1	$	67.9

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 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 September 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 after-tax gains and losses on 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 September 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	September 30, 2016			December 31, 2015
Foreign currency contracts	Other current assets	$	0.6		$	3.6
	Accrued liabilities		(1.2	)		(1.3	)
Commodities contracts	Other current assets		0.8			—
	Accrued liabilities		(1.1	)		(0.3	)

Total derivatives designated as hedging instruments		$	(0.9	)	$	2.0

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


Three Months Ended September 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)	Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)						Location of gain (loss) recognized in earnings on derivative (ineffective portion)	Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015				2016			2015				2016		2015
Foreign currency contracts	$	0.8		$	3.0		Cost of products sold	$	(0.3	)	$	1.9		N/A	$	—	$	—
Commodities contracts		(1.1	)		(0.2	)	Cost of products sold		0.7			(0.1	)	Cost of products sold		—		—

	$	(0.3	)	$	2.8			$	0.4		$	1.8				—		—


Nine Months Ended September 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)		Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)						Location of gain (loss) recognized in earnings on derivative (ineffective portion)		Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015					2016			2015					2016		2015
Foreign currency contracts	$	(4.1	)	$	5.7			Cost of products sold	$	(1.1	)	$	4.6			N/A	$	—	$	—
Commodities contracts		0.7			(0.5	)		Cost of products sold		0.7			(0.3	)		Cost of products sold		—		—

	$	(3.4	)	$	5.2				$	(0.4	)	$	4.3				$	—	$	—

- 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
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+ Details

Income Taxes

9 Months Ended

Sep. 30, 2016

Income Taxes

12.

Income Taxes

The effective income tax rates for the three and nine months ended September 30, 2016 were 29.7 percent and 29.6 percent, respectively. The effective income tax rates for the three and nine months ended September 30, 2015 were 31.3 percent and 30.7 percent, respectively. The lower effective income tax rate in the first nine months of 2016 compared to the prior year was primarily due to the early adoption of a new accounting standard for share based compensation beginning January 1, 2016.

As of September 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

9 Months Ended

Sep. 30, 2016

Changes in Accumulated Other Comprehensive Loss by Component

13.

Changes in Accumulated Other Comprehensive Loss by Component

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


(dollars in millions)
	Three Months Ended September 30,
	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(47.9	)	$	(6.9	)
Other comprehensive loss before reclassifications		(3.5	)		(17.8	)

Balance at end of period		(51.4	)		(24.7	)

Unrealized net (loss) gain on cash flow derivatives
Balance at beginning of period		(0.3	)		0.9
Other comprehensive loss before reclassifications		—			1.6
Realized gains on derivatives reclassified to cost of products sold (net of tax provision of $0.2 and $0.7 in 2016 and 2015, respectively)		(0.2	)		(1.0	)

Balance at end of period		(0.5	)		1.5

Pension liability
Balance at beginning of period		(275.3	)		(270.0	)
Other comprehensive loss before reclassifications		(0.1	)		—
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		2.5			2.7

Balance at end of period		(272.9	)		(267.3	)

Accumulated other comprehensive loss, end of period	$	(324.8	)	$	(290.5	)

⁽¹⁾Amortization of pension items:
Actuarial losses	$	4.4	⁽²⁾	$	4.8	⁽²⁾
Prior year service cost		(0.3	)⁽²⁾		(0.3	)⁽²⁾

		4.1			4.5
Income tax benefit		(1.6	)		(1.8	)

Reclassification net of income tax benefit	$	2.5		$	2.7


⁽²⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 8 - Pensions for additional details

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


(dollars in millions)
	Nine Months Ended September 30,
	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(39.4	)	$	3.3
Other comprehensive loss before reclassifications		(12.0	)		(28.0	)

Balance at end of period		(51.4	)		(24.7	)

Unrealized net gain on cash flow derivatives
Balance at beginning of period		1.2			0.9
Other comprehensive (loss) income before reclassifications		(1.9	)		3.2
Realized losses (gains) on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.2) and $1.7 in 2016 and 2015, respectively)		0.2			(2.6	)

Balance at end of period		(0.5	)		1.5

Pension liability
Balance at beginning of period		(275.2	)		(276.2	)
Other comprehensive (gain) loss before reclassifications		(5.3	)		0.7
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		7.6			8.2

Balance at end of period		(272.9	)		(267.3	)

Accumulated other comprehensive loss, end of period	$	(324.8	)	$	(290.5	)

⁽¹⁾Amortization of pension items:
Actuarial losses	$	13.2	⁽²⁾	$	14.3	⁽²⁾
Prior year service cost		(0.8	)⁽²⁾		(0.8	)⁽²⁾

		12.4			13.5
Income tax benefit		(4.8	)		(5.3	)

Reclassification net of income tax benefit	$	7.6		$	8.2


⁽²⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 8 - 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: 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=66004124&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

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

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2016

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Acquisitions (Tables)

9 Months Ended

Sep. 30, 2016

Summary of Preliminary Estimate of Fair Value of Assets Acquired and Liabilities Assumed at Date of Acquisition


August 8, 2016 (dollars in millions)
Current assets, net of cash acquired	$	7.3
Property, plant and equipment		2.7
Intangible assets		30.0
Goodwill		59.5

Total assets acquired		99.5
Current liabilities		(5.0	)
Long-term liabilities		(9.7	)

Total liabilities assumed		(14.7	)

Net assets acquired	$	84.8

Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Inventories

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


(dollars in millions)
	September 30, 2016			December 31, 2015
Finished products	$	118.0		$	85.7
Work in process		12.0			13.4
Raw materials		138.3			139.6

Inventories, at FIFO cost		268.3			238.7
LIFO reserve		(9.7	)		(15.8	)

Net inventory	$	258.6		$	222.9

Product Warranties (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Product Warranty Liability Activity

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


	Three Months Ended September 30,
(dollars in millions)	2016			2015
Balance at July 1,	$	141.5		$	138.3
Expense		10.4			11.7
Claims settled		(8.9	)		(11.2	)

Balance at September 30,	$	143.0		$	138.8


	Nine Months Ended September 30,
(dollars in millions)	2016			2015
Balance at January 1,	$	139.4		$	136.2
Expense		35.0			38.1
Claims settled		(31.4	)		(35.5	)

Balance at September 30,	$	143.0		$	138.8

Earnings per Share of Common Stock (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Denominator for basic earnings per share - weighted average shares		174,409,789		177,396,392		175,019,605		178,177,130
Effect of dilutive stock options and share units		2,138,589		1,342,756		2,097,444		1,391,714

Denominator for diluted earnings per share		176,548,378		178,739,148		177,117,049		179,568,844

Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Changes in Option Shares

Changes in option awards, all of which relate to Common Stock, were as follows for the nine months ended September 30, 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	$	18.03		2,653,558
Granted		32.08		553,370
Exercised		14.01		(508,022	)
Forfeited		28.99		(5,762	)

Outstanding at September 30, 2016		21.64		2,693,144			7 years	$	73.8

Exercisable at September 30, 2016	$	16.11		1,626,562			6 years	$	53.6

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


	Nine Months Ended September 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		27.7	%		29.3	%

Schedule of Share Unit Activity Under Plan

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


	Number of Units			Weighted-Average Grant Date Value
Issued and unvested at January 1, 2016		658,524		$	22.15
Granted		160,428			32.21
Vested		(268,306	)		17.39
Forfeited		(3,660	)		29.32

Issued and unvested at September 30, 2016		546,986		$	27.39

Pensions (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Components of Net Pension Expense

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


(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Service cost	$	0.4		$	0.5		$	1.3		$	1.5
Interest cost		7.7			9.4			23.0			28.2
Expected return on plan assets		(13.9	)		(14.3	)		(41.5	)		(43.1	)
Amortization of unrecognized loss		4.4			4.8			13.2			14.3
Amortization of prior service cost		(0.3	)		(0.3	)		(0.8	)		(0.8	)

Defined benefit plan (income) expense	$	(1.7	)	$	0.1		$	(4.8	)	$	0.1

Operations by Segment (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Operating Earnings


(dollars in millions)
	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Net sales
North America	$	450.8		$	417.4		$	1,307.5		$	1,289.3
Rest of World		240.3			217.1			697.6			634.3
Inter-segment sales		(7.2	)		(9.4	)		(17.3	)		(26.5	)

	$	683.9		$	625.1		$	1,987.8		$	1,897.1

Operating earnings
North America	$	100.5		$	90.5		$	296.5		$	247.7
Rest of World		31.1			27.4			90.9			84.5

		131.6			117.9			387.4			332.2
Corporate expense		11.1			9.1			35.6			33.0
Interest expense		2.1			1.6			5.7			6.0

Earnings before income taxes		118.4			107.2			346.1			293.2
Provision for income taxes		35.2			33.6			102.3			90.1

Net earnings	$	83.2		$	73.6		$	243.8		$	203.1

Fair Value Measurements (Tables)

9 Months Ended

Sep. 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	September 30, 2016		December 31, 2015
Quoted prices in active markets for identical assets (Level 1)	$	409.1	$	323.9
Significant other observable inputs (Level 2)		—		(0.3	)

Total assets measured at fair value	$	409.1	$	323.6

Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2016

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

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


Three Months Ended September 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)	Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)						Location of gain (loss) recognized in earnings on derivative (ineffective portion)	Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015				2016			2015				2016		2015
Foreign currency contracts	$	0.8		$	3.0		Cost of products sold	$	(0.3	)	$	1.9		N/A	$	—	$	—
Commodities contracts		(1.1	)		(0.2	)	Cost of products sold		0.7			(0.1	)	Cost of products sold		—		—

	$	(0.3	)	$	2.8			$	0.4		$	1.8				—		—


Nine Months Ended September 30 (dollars in millions):
Derivatives in ASC 815 cash flow hedging relationships	Amount of gain (loss) recognized in OCI on derivative (effective portion)						Location of gain (loss) reclassified from accumulated OCI into earnings (effective portion)		Amount of gain (loss) reclassified from accumulated OCI into earnings (effective portion)						Location of gain (loss) recognized in earnings on derivative (ineffective portion)		Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)
	2016			2015					2016			2015					2016		2015
Foreign currency contracts	$	(4.1	)	$	5.7			Cost of products sold	$	(1.1	)	$	4.6			N/A	$	—	$	—
Commodities contracts		0.7			(0.5	)		Cost of products sold		0.7			(0.3	)		Cost of products sold		—		—

	$	(3.4	)	$	5.2				$	(0.4	)	$	4.3				$	—	$	—

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)
	September 30,
	2016				2015
	Buy		Sell		Buy		Sell
British pound	$	—	$	0.2	$	—	$	1.1
Canadian dollar		—		77.2		—		64.9
Euro		6.7		0.5		9.2		1.9
Mexican peso		13.8		—		16.9		—

Total	$	20.5	$	77.9	$	26.1	$	67.9

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	September 30, 2016			December 31, 2015
Foreign currency contracts	Other current assets	$	0.6		$	3.6
	Accrued liabilities		(1.2	)		(1.3	)
Commodities contracts	Other current assets		0.8			—
	Accrued liabilities		(1.1	)		(0.3	)

Total derivatives designated as hedging instruments		$	(0.9	)	$	2.0

Changes in Accumulated Other Comprehensive Loss by Component (Tables)

9 Months Ended

Sep. 30, 2016

Changes to Accumulated Other Comprehensive Loss by Component

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


(dollars in millions)
	Three Months Ended September 30,
	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(47.9	)	$	(6.9	)
Other comprehensive loss before reclassifications		(3.5	)		(17.8	)

Balance at end of period		(51.4	)		(24.7	)

Unrealized net (loss) gain on cash flow derivatives
Balance at beginning of period		(0.3	)		0.9
Other comprehensive loss before reclassifications		—			1.6
Realized gains on derivatives reclassified to cost of products sold (net of tax provision of $0.2 and $0.7 in 2016 and 2015, respectively)		(0.2	)		(1.0	)

Balance at end of period		(0.5	)		1.5

Pension liability
Balance at beginning of period		(275.3	)		(270.0	)
Other comprehensive loss before reclassifications		(0.1	)		—
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		2.5			2.7

Balance at end of period		(272.9	)		(267.3	)

Accumulated other comprehensive loss, end of period	$	(324.8	)	$	(290.5	)

⁽¹⁾Amortization of pension items:
Actuarial losses	$	4.4	⁽²⁾	$	4.8	⁽²⁾
Prior year service cost		(0.3	)⁽²⁾		(0.3	)⁽²⁾

		4.1			4.5
Income tax benefit		(1.6	)		(1.8	)

Reclassification net of income tax benefit	$	2.5		$	2.7


⁽²⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 8 - Pensions for additional details

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


(dollars in millions)
	Nine Months Ended September 30,
	2016			2015
Cumulative foreign currency translation
Balance at beginning of period	$	(39.4	)	$	3.3
Other comprehensive loss before reclassifications		(12.0	)		(28.0	)

Balance at end of period		(51.4	)		(24.7	)

Unrealized net gain on cash flow derivatives
Balance at beginning of period		1.2			0.9
Other comprehensive (loss) income before reclassifications		(1.9	)		3.2
Realized losses (gains) on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $(0.2) and $1.7 in 2016 and 2015, respectively)		0.2			(2.6	)

Balance at end of period		(0.5	)		1.5

Pension liability
Balance at beginning of period		(275.2	)		(276.2	)
Other comprehensive (gain) loss before reclassifications		(5.3	)		0.7
Amounts reclassified from accumulated other comprehensive loss: ⁽¹⁾		7.6			8.2

Balance at end of period		(272.9	)		(267.3	)

Accumulated other comprehensive loss, end of period	$	(324.8	)	$	(290.5	)

⁽¹⁾Amortization of pension items:
Actuarial losses	$	13.2	⁽²⁾	$	14.3	⁽²⁾
Prior year service cost		(0.8	)⁽²⁾		(0.8	)⁽²⁾

		12.4			13.5
Income tax benefit		(4.8	)		(5.3	)

Reclassification net of income tax benefit	$	7.6		$	8.2


⁽²⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 8 - Pensions for additional details

Basis of Presentation - Additional Information (Detail) $ in Millions		3 Months Ended	9 Months Ended
	Apr. 11, 2016	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Disclosure Basis Of Presentation Details [Line Items]
Stock split ratio	2
Percentage of stock dividend to stock holders			100.00%
Dividend payable date			Oct. 05, 2016
Dividend date of record			Sep. 21, 2016
Recent accounting pronouncement, discrete income tax benefits associated with excess tax benefits on settled stock based compensation awards		$ 0.2	$ 5.6
Recent accounting pronouncement, cash used when shares directly withheld for employee income tax withholding purposes classified as financing activities in statements of cash flows				$ (5.8)
Recent accounting pronouncement effect on operating activities, cash used when shares directly withheld for employee income tax withholding purposes classified as financing activities in statements of cash flows				$ 5.8
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)

Acquisitions - Additional Information (Detail) - USD ($) $ in Millions			2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 26, 2016	Aug. 08, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Aggregate cash purchase price, net of cash acquired						$ 90.5
Operating earnings				$ 131.6	$ 117.9	387.4	$ 332.2
Interest expense				$ 2.1	$ 1.6	$ 5.7	$ 6.0
Aquasana
Business Acquisition [Line Items]
Percentage of ownership interest acquired		100.00%
Aggregate cash purchase price, net of cash acquired		$ 84.8
Cash acquired from business acquisition		1.9
Acquisition-related costs		1.2	$ 1.2
Acquired intangible assets		30.0
Revenues			6.2
Pre-tax loss			(1.2)
Operating earnings			0.2
Interest expense			$ 0.2
Aquasana \| Trade Names
Business Acquisition [Line Items]
Acquired intangible assets, not subject to amortization		21.5
Aquasana \| Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets, subject to amortization		$ 8.3
Acquired intangible assets, amortization period, in years		10 years
Aquasana \| Patents
Business Acquisition [Line Items]
Acquired intangible assets, subject to amortization		$ 0.2
Acquired intangible assets, amortization period, in years		3 years
Electric Water Heater Manufacturer
Business Acquisition [Line Items]
Aggregate cash purchase price, net of cash acquired	$ 5.7
Contingent consideration, conditions measurement period	10 years
Liability for the contingent consideration	$ 5.2

Summary of Preliminary Estimate of Fair Value of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Aug. 08, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 491.8		$ 420.9
Aquasana
Business Acquisition [Line Items]
Current assets, net of cash acquired		$ 7.3
Property, plant and equipment		2.7
Intangible assets		30.0
Goodwill		59.5
Total assets acquired		99.5
Current liabilities		(5.0)
Long-term liabilities		(9.7)
Total liabilities assumed		(14.7)
Net assets acquired		$ 84.8

Schedule of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventories
Finished products	$ 118.0	$ 85.7
Work in process	12.0	13.4
Raw materials	138.3	139.6
Inventories, at FIFO cost	268.3	238.7
LIFO reserve	(9.7)	(15.8)
Net inventory	$ 258.6	$ 222.9

Company's Warranty Liability Activity (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Product Warranties
Balance at beginning of year	$ 141.5	$ 138.3	$ 139.4	$ 136.2
Expense	10.4	11.7	35.0	38.1
Claims settled	(8.9)	(11.2)	(31.4)	(35.5)
Balance at end of year	$ 143.0	$ 138.8	$ 143.0	$ 138.8

Long-Term Debt - Additional Information (Detail)	9 Months Ended
Long-Term Debt - Additional Information (Detail)	Sep. 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

Schedule of Computation of Basic and Diluted Weighted-Average Shares Used in Earnings per Share Calculations (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share Of Common Stock
Denominator for basic earnings per share - weighted average shares	174,409,789	177,396,392	175,019,605	178,177,130
Effect of dilutive stock options and share units	2,138,589	1,342,756	2,097,444	1,391,714
Denominator for diluted earnings per share	176,548,378	178,739,148	177,117,049	179,568,844

Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation cost recognized	$ 1.2	$ 1.0	$ 8.1	$ 7.8
Stock option compensation recognized	$ 0.5	$ 0.5	$ 3.9	$ 3.6
Weighted-average fair value per option at the date of grant			$ 8.03	$ 8.58
Number of Options, outstanding	2,693,144		2,693,144		2,653,558
Number of options, exercisable at end of period	1,626,562		1,626,562
Number of options, exercised			508,022
Number of options, forfeited			5,762
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	26,230
Number of Options, outstanding	24,940		24,940
Number of options, exercisable at end of period	8,320		8,320
Number of options, exercised			430
Number of options, forfeited			860
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			160,428	152,070
Value of share units at the date of issuance			$ 5.2	$ 4.7
Share based compensation expense attributable to share units	$ 0.7	$ 0.5	$ 4.2	$ 4.2
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	3,268,580		3,268,580

Changes in Option Awards All of Which Related to Common Stock (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 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	$ 18.03
Weighted-Average Per Share Exercise Price - Granted \| $ / shares	32.08
Weighted-Average Per Share Exercise Price - Exercised \| $ / shares	14.01
Weighted-Average Per Share Exercise Price - Forfeited \| $ / shares	28.99
Weighted-Average Per Share Exercise Price, ending period \| $ / shares	21.64
Weighted-Average Per Share Exercise Price, Exercisable \| $ / shares	$ 16.11
Number of Options Outstanding, Beginning Balance \| shares	2,653,558
Number of Options, Granted \| shares	553,370
Number of Options, Exercised \| shares	(508,022)
Number of Options, Forfeited \| shares	(5,762)
Number of Options Outstanding, Ending Balance \| shares	2,693,144
Number of options, exercisable at end of period \| shares	1,626,562
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 \| $	$ 73.8
Aggregate Intrinsic Value, Exercisable at End of Period \| $	$ 53.6

Schedule of Weighted-Average Fair Value per Option at Date of Grant (Detail)	9 Months Ended
	Sep. 30, 2016	Sep. 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	27.70%	29.30%

Summary of Share Unit Activity Under Plan (Detail) - Restricted Stock And Share Units - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units Issued and unvested, Beginning of Period	658,524
Number of Units - Granted	160,428	152,070
Number of Units - Vested	(268,306)
Number of Units - Forfeited	(3,660)
Number of Units Issued and unvested, End of Period	546,986
Weighted-Average Grant Date Value, Beginning of Period	$ 22.15
Weighted-Average Grant Date Value - Granted	32.21
Weighted-Average Grant Date Value - Vested	17.39
Weighted-Average Grant Date Value - Forfeited	29.32
Weighted-Average Grant Date Value, End of Period	$ 27.39

Components of Company's Net Pension Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pensions [Abstract]
Service cost	$ 0.4	$ 0.5	$ 1.3	$ 1.5
Interest cost	7.7	9.4	23.0	28.2
Expected return on plan assets	(13.9)	(14.3)	(41.5)	(43.1)
Amortization of unrecognized loss	4.4	4.8	13.2	14.3
Amortization of prior service cost	(0.3)	(0.3)	(0.8)	(0.8)
Defined benefit plan (income) expense	$ (1.7)	$ 0.1	$ (4.8)	$ 0.1

Pensions - Additional Information (Detail) $ in Millions	3 Months Ended
Pensions - Additional Information (Detail) $ in Millions	Sep. 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)	9 Months Ended
Operations by Segment - Additional Information (Detail)	Sep. 30, 2016 Segment
Segment Reporting Information [Line Items]
Number of reporting segments	2

Schedule of Operating Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 683.9	$ 625.1	$ 1,987.8	$ 1,897.1
Operating earnings	131.6	117.9	387.4	332.2
Other expense (income)	(1.9)	(2.2)	(6.2)	(7.6)
Interest expense	2.1	1.6	5.7	6.0
Earnings before income taxes	118.4	107.2	346.1	293.2
Provision for income taxes	35.2	33.6	102.3	90.1
Net earnings	83.2	73.6	243.8	203.1
Inter-segment
Segment Reporting Information [Line Items]
Net sales	(7.2)	(9.4)	(17.3)	(26.5)
Corporate
Segment Reporting Information [Line Items]
Other expense (income)	11.1	9.1	35.6	33.0
North America \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	450.8	417.4	1,307.5	1,289.3
Operating earnings	100.5	90.5	296.5	247.7
Rest of World \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	240.3	217.1	697.6	634.3
Operating earnings	$ 31.1	$ 27.4	$ 90.9	$ 84.5

Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 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	$ 409.1	$ 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	$ 409.1	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		$ (0.3)

Schedule of Summary by Currency of Foreign Currency Forward Contracts (Detail) - Foreign currency forward contracts - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Buy
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	$ 20,500,000	$ 26,100,000
Buy \| Euro
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	6,700,000	9,200,000
Buy \| Mexican peso
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	13,800,000	16,900,000
Sell
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	77,900,000	67,900,000
Sell \| British pound
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	200,000	1,100,000
Sell \| Canadian dollar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	77,200,000	64,900,000
Sell \| Euro
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts of foreign currency forward contracts	$ 500,000	$ 1,900,000

Derivative Instruments - Additional Information (Detail)	9 Months Ended
	Sep. 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	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ (0.9)	$ 2.0
Foreign Currency Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	0.6	3.6
Foreign Currency Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(1.2)	(1.3)
Commodities Contracts \| Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	0.8
Commodities Contracts \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	$ (1.1)	$ (0.3)

Effect of Derivatives Designated as Hedging Instruments on Consolidated Statement of Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	$ (0.3)	$ 2.8	$ (3.4)	$ 5.2
Amount of gain/(loss) reclassified from accumulated OCI into earnings (effective portion)	0.4	1.8	(0.4)	4.3
Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)	0.0	0.0	0.0	0.0
Foreign Currency Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	0.8	3.0	(4.1)	5.7
Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)	0.0	0.0	0.0	0.0
Foreign Currency Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from accumulated OCI into earnings (effective portion)	(0.3)	1.9	(1.1)	4.6
Commodities Contracts
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI on derivative (effective portion)	(1.1)	(0.2)	0.7	(0.5)
Commodities Contracts \| Cost Of Products Sold
Derivative [Line Items]
Amount of gain/(loss) reclassified from accumulated OCI into earnings (effective portion)	0.7	(0.1)	0.7	(0.3)
Amount of gain (loss) recognized in earnings on a derivative (ineffective portion)	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Contingency [Line Items]
Effective tax rates	29.70%	31.30%	29.60%	30.70%
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

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

3 Months Ended

9 Months Ended

Sep. 30, 2016

Sep. 30, 2015

Sep. 30, 2016

Sep. 30, 2015

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

$ 1,442.3

Ending balance

$ 1,525.6

1,525.6

Cumulative foreign currency translation

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(47.9)

$ (6.9)

(39.4)

$ 3.3

Other comprehensive (loss) income before reclassifications

(3.5)

(17.8)

(12.0)

(28.0)

Ending balance

(51.4)

(24.7)

(51.4)

(24.7)

Unrealized net gain (loss) on cash flow derivatives

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(0.3)

0.9

1.2

0.9

Other comprehensive (loss) income before reclassifications

1.6

(1.9)

3.2

Realized (gains) losses on derivatives reclassified to cost of products sold (net of tax (benefit) provision of $0.2, $0.7 in 03 months ended September 30, 2016 and 2015 respectively and $(0.2), $1.7 in 09 months ended September 30, 2016 and 2015 respectively)

(0.2)

(1.0)

0.2

(2.6)

Ending balance

(0.5)

1.5

(0.5)

1.5

Pension liability

Accumulated Other Comprehensive Income (Loss) [Line Items]

Beginning balance

(275.3)

(270.0)

(275.2)

(276.2)

Other comprehensive (loss) income before reclassifications

(0.1)

(5.3)

0.7

Amounts reclassified from accumulated other comprehensive loss

2.5

^[1]

2.7

^[1]

7.6

^[2]

8.2

^[2]

Ending balance

(272.9)

(267.3)

(272.9)

(267.3)

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Ending balance

$ (324.8)

$ (290.5)

$ (324.8)

$ (290.5)

[1]	Amortization of pension items: Actuarial losses $ 4.4 (2) $ 4.8 (2) Prior year service cost (0.3 )(2) (0.3 )(2) 4.1 4.5 Income tax benefit (1.6 ) (1.8 ) Reclassification net of income tax benefit $ 2.5 $ 2.7
[2]	Amortization of pension items: Actuarial losses $ 13.2 (2) $ 14.3 (2) Prior year service cost (0.8 )(2) (0.8 )(2) 12.4 13.5 Income tax benefit (4.8 ) (5.3 ) Reclassification net of income tax benefit $ 7.6 $ 8.2

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

3 Months Ended

9 Months Ended

Sep. 30, 2016

Sep. 30, 2015

Sep. 30, 2016

Sep. 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

$ 0.2

$ 0.7

$ (0.2)

$ 1.7

Pension liability

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification, before income tax benefit

4.1

4.5

12.4

13.5

Income tax benefit

(1.6)

(1.8)

(4.8)

(5.3)

Reclassification net of income tax benefit

2.5

^[1]

2.7

^[1]

7.6

^[2]

8.2

^[2]

Actuarial losses

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification, before income tax benefit

^[3]

4.4

4.8

13.2

14.3

Prior year service cost

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification, before income tax benefit

^[3]

$ (0.3)

$ (0.8)

[1]	Amortization of pension items: Actuarial losses $ 4.4 (2) $ 4.8 (2) Prior year service cost (0.3 )(2) (0.3 )(2) 4.1 4.5 Income tax benefit (1.6 ) (1.8 ) Reclassification net of income tax benefit $ 2.5 $ 2.7
[2]	Amortization of pension items: Actuarial losses $ 13.2 (2) $ 14.3 (2) Prior year service cost (0.8 )(2) (0.8 )(2) 12.4 13.5 Income tax benefit (4.8 ) (5.3 ) Reclassification net of income tax benefit $ 7.6 $ 8.2
[3]	These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 8 - Pensions for additional details