Armstrong World Industries (AWI) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 21, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	ARMSTRONG WORLD INDUSTRIES INC
Entity Central Index Key	7431
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		55,276,151
Trading Symbol	awi

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Earnings And Comprehensive Income (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements Of Earnings And Comprehensive Income [Abstract]
Net sales	$551.40	$590
Cost of goods sold	421.9	447.9
Gross profit	129.5	142.1
Selling, general and administrative expenses	103	103.1
Separation costs	4.3
Equity earnings from joint venture	-13.6	-14.8
Operating income	35.8	53.8
Interest expense	11.2	11.6
Other non-operating expense	1.3	5.4
Other non-operating (income)	-0.6	-0.6
Earnings from continuing operations before income taxes	23.9	37.4
Income tax expense	20.1	19.3
Earnings from continuing operations	3.8	18.1
Net loss from discontinued operations, net of tax benefit of ($-) and ($-)		-1.2
Earnings from disposal of discontinued business, net of tax benefit of ($43.4) and ($-)	42.8
Net earnings (loss) from discontinued operations	42.8	-1.2
Net earnings	46.6	16.9
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	-15.3	-0.4
Derivative loss	-0.5	-0.6
Pension and postretirement adjustments	11.9	7.1
Total other comprehensive (loss) income	-3.9	6.1
Total comprehensive income	$42.70	$23
Earnings per share of common stock, continuing operations:
Basic	$0.07	$0.33
Diluted	$0.07	$0.33
Earnings (loss) per share of common stock, discontinued operations:
Basic	$0.77	($0.02)
Diluted	$0.76	($0.02)
Net earnings per share of common stock:
Basic	$0.84	$0.31
Diluted	$0.83	$0.30
Average number of common shares outstanding:
Basic	55.3	54.8
Diluted	55.7	55.3

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements Of Earnings And Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Condensed Consolidated Statements Of Earnings And Comprehensive Income [Abstract]
Earnings from sale of discontinued business, tax benefit	($43.40)

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$132	$185.30
Accounts and notes receivable, net	215.8	195.2
Inventories, net	351.4	335.5
Deferred income taxes	20.4	31.4
Income tax receivable	14.3	5.3
Other current assets	57.9	58.8
Total current assets	791.8	811.5
Property, plant, and equipment, less accumulated depreciation and amortization of $661.5 and $644.3, respectively	1,053.30	1,062.40
Prepaid pension costs	6.9	7.4
Investment in joint venture	127.3	129
Intangible assets, net	499.5	501.4
Deferred income taxes	26.9	26.6
Other non-current assets	68.1	67.9
Total assets	2,573.80	2,606.20
Current liabilities:
Current installments of long-term debt	42.8	39.6
Accounts payable and accrued expenses	325.5	345.5
Income tax payable	2	2.5
Deferred income taxes	0.5	0.5
Total current liabilities	370.8	388.1
Long-term debt, less current installments	992.5	1,003
Postretirement benefit liabilities	200.5	201.5
Pension benefit liabilities	100.5	115.5
Other long-term liabilities	50.8	53.2
Income tax payable	53.7	51.1
Deferred income taxes	107.8	144.7
Total noncurrent liabilities	1,505.80	1,569
Shareholders' equity:
Common stock, $0.01 par value per share, 200 million shares authorized, 60,330,506 shares issued, and 55,273,124 shares outstanding at March 31, 2015 and 60,183,535 shares issued and 55,126,153 shares outstanding at December 31, 2014	0.6	0.6
Capital in excess of par value	1,139.80	1,134.40
Retained earnings	317.6	271
Treasury stock, at cost, 5,057,382 shares	-261.4	-261.4
Accumulated other comprehensive loss	-499.4	-495.5
Total shareholders' equity	697.2	649.1
Total liabilities and shareholders' equity	$2,573.80	$2,606.20

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
Condensed Consolidated Balance Sheets [Abstract]
Property, plant and equipment, accumulated depreciation and amortization	$661.50	$644.30
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	60,330,506	60,183,535
Common stock, shares outstanding	55,273,124	55,126,153
Treasury stock, shares	5,057,382	5,057,382

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Shareholders' Equity (USD $)	Common Stock [Member]	Capital In Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
In Millions, except Share data
Balance at Dec. 31, 2013	$0.60	$1,098.40	$207.20	($261.40)	($371.60)	$673.20
Treasury stock shares, balance at Dec. 31, 2013				5,057,382
Common stock shares, balance at Dec. 31, 2013	54,406,927
Stock issuance, net	400,098
Share-based employee compensation		14				14
Net earnings			16.9			16.9
Other comprehensive (loss) income					6.1	6.1
Balance at Mar. 31, 2014	0.6	1,112.40	224.1	-261.4	-365.5	710.2
Treasury stock shares, balance at Mar. 31, 2014				5,057,382
Common stock shares, balance at Mar. 31, 2014	54,807,025
Balance at Dec. 31, 2014	0.6	1,134.40	271	-261.4	-495.5	649.1
Treasury stock shares, balance at Dec. 31, 2014				5,057,382		5,057,382
Common stock shares, balance at Dec. 31, 2014	55,126,153					55,126,153
Stock issuance, net	146,971
Share-based employee compensation		5.4				5.4
Net earnings			46.6			46.6
Other comprehensive (loss) income					-3.9	-3.9
Balance at Mar. 31, 2015	$0.60	$1,139.80	$317.60	($261.40)	($499.40)	$697.20
Treasury stock shares, balance at Mar. 31, 2015				5,057,382		5,057,382
Common stock shares, balance at Mar. 31, 2015	55,273,124					55,273,124

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net earnings	$46.60	$16.90
Adjustments to reconcile net earnings to net cash used for operating activities:
Depreciation and amortization	28.5	30
Deferred income taxes	-32	11.8
Share-based compensation	4.2	5.1
Equity earnings from joint venture	-13.6	-14.8
U.S. pension expense	6.3	0.2
Non-cash foreign currency translation on intercompany loans	-0.6	6.6
Other, non-cash adjustments, net	-1.1
Changes in operating assets and liabilities:
Receivables	-25.4	-22.9
Inventories	-19.4	-47.2
Other current assets	1.9	-9.9
Other non-current assets	-3	-2.6
Accounts payable and accrued expenses	-22	-6.1
Income taxes payable	-6.9	5.8
Other long-term liabilities	-1.9	-7
Other, net	4.3	1.2
Net cash (used for) operating activities	-34.1	-32.9
Cash flows from investing activities:
Purchases of property, plant and equipment	-26.2	-40.9
Return of investment from joint venture	15.3	18.2
Payment of company owned life insurance, net		-0.2
Proceeds from the sale of assets	2.8	0.9
Net cash (used for) investing activities	-8.1	-22
Cash flows from financing activities:
Proceeds from revolving credit facility and other short-term debt		67.8
Payments of revolving credit facility and other short-term debt		-25
Payments of long-term debt	-7.4	-1.2
Special dividends paid	-1.2	-1.2
Proceeds from exercised stock options	3.2	8.8
Excess tax benefits from stock-based compensation		2.7
Payment of company owned life insurance loans, net	-0.1
Net cash provided by (used for) financing activities	-5.5	51.9
Effect of exchange rate changes on cash and cash equivalents	-5.6	-1.2
Net (decrease) in cash and cash equivalents	-53.3	-4.2
Cash and cash equivalents at beginning of year	185.3	135.2
Cash and cash equivalents at end of period	132	131
Cash and cash equivalents at end of year of continuing operations	132	128.3
Supplemental Cash Flow Disclosures:
Interest paid	10	10
Income taxes paid, net	15.6	1.7
Amounts in accounts payable for capital expenditures	$20.20	$16.80

Business_And_Basis_Of_Presenta

Business And Basis Of Presentation	3 Months Ended
	Mar. 31, 2015
Nature Of Operations [Abstract]
Business And Basis Of Presentation	NOTE 1.  BUSINESS AND BASIS OF PRESENTATION
	Armstrong World Industries, Inc. (“AWI”) is a Pennsylvania corporation incorporated in 1891. When we refer to "we," "our" and "us" in these notes, we are referring to AWI and its subsidiaries.  We use the term “AWI” when we are referring solely to Armstrong World Industries, Inc.
	On February 19, 2015, our Board of Directors approved a plan to separate our flooring business from our ceilings (building products) business through a spinoff, which would result in two independent, publicly-traded companies.  Separation costs of $4.3 million in the first quarter of 2015 primarily relate to outside professional services and employee retention accruals incurred in conjunction with this initiative.  The separation is expected to be completed in the first quarter of 2016.
	In December 2000, AWI filed a voluntary petition for relief (the “Filing”) under Chapter 11 of the U.S. Bankruptcy Code (the “Bankruptcy Code”) in the United States Bankruptcy Court for the District of Delaware (the “Bankruptcy Court”) in order to use the court-supervised reorganization process to achieve a resolution of AWI’s asbestos-related liability.  In  October 2006, AWI’s court-approved plan of reorganization became effective and AWI emerged from Chapter 11.  All claims in AWI’s Chapter 11 case have been resolved and closed.
	In  October 2006,  the Armstrong World Industries, Inc. Asbestos Personal Injury Settlement Trust (the “Asbestos PI Trust”) was created to address AWI’s personal injury (including wrongful death) asbestos-related liability.  All present and future asbestos-related personal injury claims against AWI, including contribution claims of co-defendants but excluding certain foreign claims against subsidiaries, arising directly or indirectly out of AWI’s pre-Filing use of, or other activities involving, asbestos are channeled to the Asbestos PI Trust.
	From the fourth quarter of 2012 through the fourth quarter of 2014, the Asbestos PI Trust sold 20,448,362 shares of our common stock.  In the first quarter of 2015, the Asbestos Trust sold 2,739,944 shares of our common stock.  See Note 9 for discussion of the related income tax impact.  We did not sell any shares and did not receive any proceeds from these transactions.  As a result of these transactions the Asbestos PI Trust held approximately 12% of our outstanding shares as of March 31, 2015.
	The accounting policies used in preparing the Condensed Consolidated Financial Statements in this Form 10-Q are the same as those used in preparing the Consolidated Financial Statements for the year ended December 31, 2014.  These statements should therefore be read in conjunction with the Consolidated Financial Statements and notes that are included in the Form 10-K for the fiscal year ended December 31, 2014.  In the opinion of management, all adjustments of a normal recurring nature have been included to provide a fair statement of the results for the reporting periods presented.  Quarterly results are not necessarily indicative of annual earnings, primarily due to the different level of sales in each quarter of the year and the possibility of changes in general economic conditions.
	These Condensed Consolidated Financial Statements are prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).  The statements include management estimates and judgments, where appropriate.  Management utilizes estimates to record many items including certain asset values, allowances for bad debts, inventory obsolescence and lower of cost or market charges, warranty reserves, workers’ compensation, general liability and environmental claims and income taxes.  When preparing an estimate, management determines the amount based upon the consideration of relevant information.  Management may confer with outside parties, including outside counsel.  Actual results may differ from these estimates.
	Operating results for the first quarter of 2015 and 2014 included in this report are unaudited.  However, these Condensed Consolidated Financial Statements have been reviewed by an independent registered public accounting firm in accordance with standards of the Public Company Accounting Oversight Board (United States) for a limited review of interim financial information.
	Certain amounts in the prior year’s Condensed Consolidated Financial Statements have been recast to conform to the 2015 presentation.
	Recently Adopted Accounting Standards
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08 “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity” which is part of Accounting Standards Codification (“ASC”) 205: Presentation of Financial Statements and ASC 360: Property, Plant and Equipment. The amendments in this guidance change the requirements for reporting discontinued operations. Under the new guidance a disposal of a component of an entity or a group of components is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results. The guidance is effective prospectively for disposals that occur within annual periods beginning on or after December 15, 2014. There was no impact on our financial condition, results of operations or cash flows as a result of the adoption of this guidance.
	Recently Issued Accounting Standards
	In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers”. The guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to a customer. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, January 1, 2017. On April 1, 2015, the FASB tentatively agreed to propose a one-year deferral of the effective date for ASU 2014-09, but would permit  public business entities to adopt the standard as of the original effective date.  We are currently evaluating the impact this guidance will have on our financial condition, results of operations and cash flows.
	In June 2014, the FASB issued ASU 2014-12 “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period” which is part of ASC 718: Compensation-Stock Compensation. The guidance requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition and should not be reflected in the estimate of the grant-date fair value of the award. The guidance is effective for annual periods beginning after December 15, 2015. The guidance can be applied prospectively for all awards granted or modified after the effective date or retrospectively to all awards with performance targets outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. We do not expect a material impact on our financial condition, results of operations or cash flows from the adoption of this guidance.
	In April 2015, the FASB issued ASU 2015-03, "Simplifying the Presentation of Debt Issuance Costs." This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of a deferred charge. The new guidance is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We are currently evaluating the impact the adoption of this standard would have on our financial condition, results of operations and cash flows.

Segment_Results

Segment Results	3 Months Ended
	Mar. 31, 2015
Segment Results [Abstract]
Segment Results
	NOTE 2.  SEGMENT RESULTS
		Three Months Ended
		March 31,
		2015	2014
	Net sales to external customers
	Building Products	$	$
		292.0	308.2
	Resilient Flooring	156.8	163.7
	Wood Flooring	102.6	118.1
	Total net sales to external customers	$	$
		551.4	590.0
		Three Months Ended
		March 31,
		2015	2014
	Segment operating income (loss)
	Building Products	$	$
		59.8	57.8
	Resilient Flooring	5.9	10.4
	Wood Flooring	-1.2	5.1
	Unallocated Corporate	-28.7	-19.5
	Total consolidated operating income	$	$
		35.8	53.8
		Three Months Ended
		March 31,
		2015	2014
	Total consolidated operating income	$	$
		35.8	53.8
	Interest expense	11.2	11.6
	Other non-operating expense	1.3	5.4
	Other non-operating income	-0.6	-0.6
	Earnings from continuing operations before income taxes	$	$
		23.9	37.4
		31-Mar-15	31-Dec-14
	Segment assets
	Building Products	$	$
		1,069.1	1,079.7
	Resilient Flooring	510.4	492.7
	Wood Flooring	342.5	329.8
	Unallocated Corporate	651.8	704.0
	Total consolidated assets	$	$
		2,573.8	2,606.2
	Impairment testing of our tangible assets occurs whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable.

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2015
Discontinued Operations [Abstract]
Discontinued Operations	NOTE 3. DISCONTINUED OPERATIONS
	On December 4, 2014, our Board of Directors approved the cessation of funding to our DLW subsidiary, which at that time was our European flooring business. As a result, DLW management filed for insolvency in Germany on December 11, 2014. The German insolvency court subsequently appointed an administrator (the “Administrator”) to oversee DLW operations through the preliminary insolvency period. As a result of the insolvency filing, the appointment of the Administrator and our resulting loss of control of DLW’s operations to the German insolvency court and the Administrator, effective December 11, 2014, we deconsolidated DLW from our financial statements and presented DLW for all historical periods as a discontinued operation.
	The financial results of the DLW business have been reclassified as discontinued operations for all periods presented.
	The following is a summary of the results related to the DLW business, (previously shown within the Resilient Flooring reporting segment), which are included in discontinued operations.
		Three Months Ended
		31-Mar-15
	Loss before income tax	($0.60)
	Income tax benefit	43.4
	Net earnings from disposal of discontinued business	$
		42.8
		Three Months Ended
		31-Mar-14
	Net Sales	$
		44.4
	Loss before income tax	-1.2
	Income tax benefit	-
	Net loss from discontinued operations	($1.20)
	Based on the progress of DLW’s bankruptcy proceedings in Germany, we recorded a non-cash income tax benefit of $43.4 million during the first quarter of 2015.  The tax benefit resulted from DLW’s excess of liabilities over assets, combined with AWI’s foreign and U.S. federal income tax basis in DLW at the time of disposition.  Based on the U.S. federal income tax planning strategies employed by AWI related to DLW and the applicable U.S. federal income tax regulations, the tax benefit associated with the disposition of DLW was not available until certain procedural elements surrounding DLW’s bankruptcy process were complete.  Such procedural activities occurred during the first quarter of 2015.
	At deconsolidation, DLW had a net liability of $12.9 million, representing assets of $151.9 million and liabilities of $164.8 million, which were removed from our balance sheet. This net liability of $12.9 million was recognized as a contingent liability on our consolidated balance sheet pending the closure and results of the insolvency proceedings. Any shortfall will be recognized immediately when identified and any excess will be reflected when insolvency proceedings are finalized, all through discontinued operations.
	The Condensed Consolidated Statement of Cash Flows does not separately report the cash flows of the discontinued operation.
	We have agreed with the Administrator to continue to purchase linoleum and homogenous flooring products for sale in the Americas and the Pacific Rim, and to provide administrative support services to DLW for information technology and accounts receivables and payables for a limited transition period. These agreements are not material.

Accounts_And_Notes_Receivable

Accounts And Notes Receivable	3 Months Ended
	Mar. 31, 2015
Accounts And Notes Receivable [Abstract]
Accounts And Notes Receivable
	NOTE 4. ACCOUNTS AND NOTES RECEIVABLE
		31-Mar-15	31-Dec-14
	Customer receivables	$	$
		229.1	209.7
	Customer notes	2.2	1.3
	Miscellaneous receivables	8.8	9.3
	Less allowance for warranties, discounts and losses	-24.3	-25.1
	Accounts and notes receivable, net	$	$
		215.8	195.2
	Generally, we sell our products to select, pre-approved customers whose businesses are affected by changes in economic and market conditions.  We consider these factors and the financial condition of each customer when establishing our allowance for losses from doubtful accounts.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventories [Abstract]
Inventories
	NOTE 5.  INVENTORIES
		31-Mar-15	31-Dec-14
	Finished goods	$	$
		250.1	243.2
	Goods in process	26.0	23.0
	Raw materials and supplies	138.9	133.9
	Less LIFO and other reserves	-63.6	-64.6
	Total inventories, net	$	$
		351.4	335.5

Other_Current_Assets

Other Current Assets	3 Months Ended
	Mar. 31, 2015
Other Current Assets [Abstract]
Other Current Assets	NOTE 6. OTHER CURRENT ASSETS
		31-Mar-15	31-Dec-14
	Prepaid expenses	$	$
		42.6	47.6
	Fair value of derivative assets	7.6	5.7
	Other	7.7	5.5
	Total other current assets	$	$
		57.9	58.8

Equity_Investments

Equity Investments	3 Months Ended
	Mar. 31, 2015
Equity Investments [Abstract]
Equity Investments	NOTE 7.  EQUITY INVESTMENT
	Investment in joint venture at March 31, 2015 reflected our 50% equity interest in our Worthington Armstrong Venture (“WAVE”) joint venture with Worthington Industries, Inc.  Condensed income statement data for WAVE is summarized below:
		Three Months Ended
		March 31,
		2015	2014
	Net sales	$	$
		86.6	92.3
	Gross profit	40.8	43.5
	Net earnings	30.5	32.2

Intangible_Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2015
Intangible Assets [Abstract]
Intangible Assets
	NOTE 8.  INTANGIBLE ASSETS
	The following table details amounts related to our intangible assets as of March 31, 2015 and December 31, 2014.
			31-Mar-15		31-Dec-14
		Estimated Useful Life	Gross Carrying Amount	Accumulated Amortization	Gross Carrying Amount	Accumulated Amortization
	Amortizing intangible assets
	Customer relationships	20 years	$	$	$	$
			165.4	70.5	165.4	68.4
	Developed technology	15 years	86.1	46.6	84.9	45.1
	Other	Various	21.1	2.4	21.3	2.4
	Total		$	$	$	$
			272.6	119.5	271.6	115.9
	Non-amortizing intangible assets
	Trademarks and brand names	Indefinite	346.4		345.7
	Total intangible assets		$		$
			619.0		617.3
		Three Months Ended
		March 31,
		2015	2014
	Amortization expense	$	$
		3.6	3.6

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Taxes [Abstract]
Income Taxes	NOTE 9.  INCOME TAX EXPENSE
		Three Months Ended
		March 31,
		2015	2014
	Earnings from continuing operations before income taxes	$	$
		23.9	37.4
	Income tax expense	20.1	19.3
	Effective tax rate	84.1%	51.6%
	The effective tax rate for the first quarter of 2015 was higher than the comparable period of 2014 primarily due to $3.2 million of state net operating loss write-offs as a result of a change in ownership under Section 382 of the Internal Revenue Code in the first quarter of 2015, and a higher rate impact of unbenefitted foreign losses due to lower pretax income than in the first quarter of 2014.
	We do not expect to record any material changes during 2015 to unrecognized tax benefits that were claimed on tax returns covering tax years ending on or before December 31, 2014.
	As of March 31, 2015, we consider foreign unremitted earnings to be permanently reinvested.

Pensions_And_Other_Benefit_Pro

Pensions And Other Benefit Programs	3 Months Ended
	Mar. 31, 2015
Pensions And Other Benefit Programs [Abstract]
Pensions And Other Benefit Programs	NOTE 10.  PENSIONS AND OTHER BENEFIT PROGRAMS
	Following are the components of net periodic benefit costs:
		Three Months Ended
		March 31,
		2015	2014
	U.S. defined-benefit plans:
	Pension benefits
	Service cost of benefits earned during the period	$	$
		4.1	3.6
	Interest cost on projected benefit obligation	20.2	21.4
	Expected return on plan assets	-35.1	-34.8
	Amortization of prior service cost	0.5	0.5
	Amortization of net actuarial loss	18.2	10.6
	Net periodic pension cost	$	$
		7.9	1.3
	Retiree health and life insurance benefits
	Service cost of benefits earned during the period	$	$
		0.2	0.2
	Interest cost on projected benefit obligation	2.0	2.7
	Amortization of prior service credit	-0.2	-0.1
	Amortization of net actuarial gain	-1.9	-1
	Net periodic postretirement benefit cost	$	$
		0.1	1.8
	Non-U.S. defined-benefit pension plans
	Service cost of benefits earned during the period	$	$
		0.6	0.6
	Interest cost on projected benefit obligation	2.1	2.7
	Expected return on plan assets	-2.3	-2.9
	Amortization of net actuarial loss	0.7	0.5
	Net periodic pension cost	$	$
		1.1	0.9

Financial_Instruments

Financial Instruments	3 Months Ended
	Mar. 31, 2015
Financial Instruments [Abstract]
Financial Instruments	NOTE 11. FINANCIAL INSTRUMENTS
	We do not hold or issue financial instruments for trading purposes.  The estimated fair values of our financial instruments are as follows:
		31-Mar-15		31-Dec-14
		Carrying amount	Estimated fair value	Carrying amount	Estimated fair value
	Assets (Liabilities), net:
	Total long-term debt, including current portion	($1,035.30)	($1,032.90)	($1,042.60)	($1,028.20)
	Foreign currency contracts	8.5	8.5	5.4	5.4
	Natural gas contracts	-2.7	-2.7	-3	-3
	Interest rate swap contracts	-13.3	-13.3	-9.3	-9.3
	The carrying amounts of cash and cash equivalents, receivables, accounts payable, accrued expenses, and short-term debt approximate fair value because of the short-term maturity of these instruments.  The fair value estimates of long-term debt were based upon quotes from a major financial institution of recently observed trading levels of our Term Loan B debt.  The fair value estimates of foreign currency contract obligations are estimated from market quotes provided by a well-recognized national market data provider.  The fair value estimates of natural gas contracts are estimated using internal valuation models with verification by obtaining quotes from major financial institutions.  For natural gas swap transactions, fair value is calculated using NYMEX market quotes provided by a well-recognized national market data provider.  For natural gas option based strategies, fair value is calculated using an industry standard Black-Scholes model with market based inputs, including but not limited to, underlying asset price, strike price, implied volatility, discounted risk free rate and time to expiration, provided by a well-recognized national market data provider.  The fair value estimates for interest rate swap contracts are estimated by obtaining quotes from major financial institutions with verification by internal valuation models.
	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date.  Three levels of inputs may be used to measure fair value:
		Level 1 — Quoted prices in active markets for identical assets or liabilities.
		Level 2 — Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
		Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.  This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.
	Assets and liabilities measured at fair value on a recurring basis are summarized below:
		31-Mar-15		31-Dec-14
		Fair value based on		Fair value based on
		Quoted,     active     markets	Other observable inputs	Quoted,     active     markets	Other observable inputs
		Level 1	Level 2	Level 1	Level 2
	Assets (Liabilities), net:
	Total long-term debt, including current portion	($464.30)	($568.60)	($459.80)	($568.40)
	Foreign currency contracts	8.5	-	5.4	-
	Natural gas contracts	-	-2.7	-	-3
	Interest rate swap contracts	-	-13.3	-	-9.3
	We do not have any financial assets or liabilities that are valued using Level 3 (unobservable) inputs.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments
	NOTE 12.  DERIVATIVE FINANCIAL INSTRUMENTS
	We are exposed to market risk from changes in foreign exchange rates, interest rates and commodity prices that could impact our results of operations, cash flows and financial condition.  We use forward swaps and option contracts to hedge these exposures.  Exposure to individual counterparties is controlled and derivative financial instruments are entered into with a diversified group of major financial institutions.  Forward swaps and option contracts are entered into for periods consistent with underlying exposure and do not constitute positions independent of those exposures.  At inception, hedges that we designate as hedging instruments are formally documented as either (1) a hedge of a forecasted transaction or “cash flow” hedge, or (2) a hedge of the fair value of a recognized liability or asset or “fair value” hedge.  We also formally assess both at inception and at least quarterly thereafter, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in either the fair value or cash flows of the hedged item.  If it is determined that a derivative ceases to be a highly effective hedge, or if the anticipated transaction is no longer probable of occurring, we discontinue hedge accounting, and any future mark-to-market adjustments are recognized in earnings.  We use derivative financial instruments as risk management tools and not for speculative trading purposes.
	Counterparty Risk
	We only enter into derivative transactions with established counterparties having a credit rating of BBB or better.  We monitor counterparty credit default swap levels and credit ratings on a regular basis.  All of our derivative transactions with counterparties are governed by master International Swap and Derivatives Association agreements (“ISDAs”) with netting arrangements.  These agreements can limit our exposure in situations where we have gain and loss positions outstanding with a single counterparty.  We do not post nor do we receive cash collateral with any counterparty for our derivative transactions.  These ISDAs do not have any credit contingent features; however, a default under our bank credit facility would trigger a default under these agreements.  Exposure to individual counterparties is controlled, and thus we consider the risk of counterparty default to be negligible.
	Commodity Price Risk
	We purchase natural gas for use in the manufacturing process and to heat many of our facilities.  As a result, we are exposed to fluctuations in the price of natural gas.  We have a policy to reduce cost volatility for North American natural gas purchases by purchasing natural gas forward contracts and swaps, purchased call options, and zero-cost collars up to 24 months forward.  The contracts are based on forecasted usage of natural gas measured in mmBtu’s.  There is a high correlation between the hedged item and the hedge instrument.  The gains and losses on these instruments offset gains and losses on the transactions being hedged.  These instruments are designated as cash flow hedges.  At March 31, 2015 and December 31, 2014, the notional amount of these hedges was $10.1 million and $14.6 million, respectively.  The mark-to-market gain or loss on qualifying hedges is included in other comprehensive income to the extent effective, and reclassified into cost of goods sold in the period during which the underlying gas is consumed.  The mark-to-market gains or losses on ineffective portions of hedges are recognized in cost of goods sold immediately.  The earnings impact of the ineffective portion of these hedges was not material for the first quarters of 2015 and 2014.
	Currency Rate Risk – Sales and Purchases
	We manufacture and sell our products in a number of countries throughout the world and, as a result, we are exposed to movements in foreign currency exchange rates.  To a large extent, our global manufacturing and sales provide a natural hedge of foreign currency exchange rate movement, as foreign currency expenses generally offset foreign currency revenues.  We manage our cash flow exposures on a net basis and use derivatives to hedge the majority of our unmatched foreign currency cash inflows and outflows.  As of March 31, 2015, our major, pre-hedging foreign currency exposures are to the Canadian dollar, the Chinese Renminbi and the Euro.
	We use foreign currency forward exchange contracts to reduce our exposure to the risk that the eventual net cash inflows and outflows resulting from the sale of products to foreign customers and purchases from foreign suppliers will be adversely affected by changes in exchange rates.  These derivative instruments are used for forecasted transactions and are classified as cash flow hedges.  Cash flow hedges are executed quarterly, generally up to 15 months forward, and allow us to further reduce our overall exposure to exchange rate movements, since gains and losses on these contracts offset gains and losses on the transactions being hedged.  The notional amount of these hedges was $101.7 million and $102.4 million at March 31, 2015 and December 31, 2014, respectively.  Gains and losses on these instruments are recorded in other comprehensive income, to the extent effective, until the underlying transaction is recognized in earnings.  The earnings impact of the ineffective portion of these hedges was not material for the first quarters of 2015 and 2014.
	Currency Rate Risk - Intercompany Loans and Dividends
	We may use foreign currency forward exchange contracts to hedge exposures created by cross-currency intercompany loans and dividends.  The translation adjustments related to these loans are recorded in other non-operating income or expense.  The offsetting gains or losses on the related derivative contracts are also recorded in other non-operating income or expense.  These contracts are decreased or increased as repayments are made or additional intercompany loans are extended or adjusted for intercompany dividend activity as necessary.  The notional amount of these hedges was $21.2 million at December 31, 2014.  We did not have any open hedges related to intercompany loans and dividends as of March 31, 2015.
	Interest Rate Risk
	We utilize interest rate swaps to minimize the fluctuations in earnings caused by interest rate volatility. Interest expense on variable-rate liabilities increases or decreases as a result of interest rate fluctuations. The following table summarizes our interest rate swaps:
	Trade Date		Notional Amount		Interest Rate Paid			Coverage Period	Risk Coverage
	31-Mar-11		$100.00		2.303%			March 2011 to November 2015	Term Loan A
	31-Mar-11		$200.00		2.523%			March 2011 to November 2015	Term Loan B
	27-Mar-12		$250.00		1.928%			March 2012 to March 2018	Term Loan B
	27-Mar-12		$200.00		2.810%			November 2015 to March 2018	Term Loan B
	16-Apr-13		$250.00		1.398%			November 2015 to March 2018	Term Loan A
	Under the terms of the Term Loan A swaps we receive 3-month LIBOR and pay a fixed rate over the hedged period.  Under the terms of the Term Loan B swaps, we receive the greater of 3-month LIBOR or the 1% LIBOR Floor and pay a fixed rate over the hedged period.  These swaps are designated as cash flow hedges against changes in LIBOR for a portion of our variable rate debt.
	Financial Statement Impacts
	The following tables detail amounts related to our derivatives as of March 31, 2015 and December 31, 2014.  Our derivative liabilities not designated as hedging instruments were $0.5 million at December 31, 2014.  We had no derivative assets not designated as hedging instruments at March 31, 2015 and December 31, 2014 and no derivative liabilities not designated as hedging instruments at March 31, 2015. The derivative asset and liability amounts below are shown in gross amounts; we have not netted assets with liabilities.
		Derivative Assets					Derivative Liabilities
			Fair Value					Fair Value
		Balance Sheet   Location	31-Mar-15		31-Dec-14		Balance Sheet   Location	31-Mar-15	31-Dec-14
	Derivatives designated as hedging instruments
	Natural gas commodity contracts	Other current assets	-		-		Accounts payable and accrued expenses	$	$
								2.5	3.0
	Foreign exchange contracts	Other current assets	$		$		Accounts payable and accrued expenses	1.1	0.7
			7.6		5.6
	Interest rate swap contracts	Other current assets	-		-		Accounts payable and accrued expenses	3.3	-
	Natural gas commodity contracts	Other non-current assets	-		-		Other long-term liabilities	0.2	-
	Foreign exchange contracts	Other non-current assets	2.2		0.9		Other long-term liabilities	0.2	0.1
	Interest rate swap contracts	Other non-current assets	-		1.9		Other long-term liabilities	10.0	11.2
	Total derivatives designated as hedging instruments		$		$			$	$
			9.8		8.4			17.3	15.0
		Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)(a)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
		Three Months Ended				Three Months Ended
		March 31,				March 31,
		2015		2014		2015		2014
	Derivatives in Cash Flow Hedging Relationships
	Natural gas commodity contracts	($2.70)		$	Cost of goods sold	($1.50)		$
				0.6				0.7
	Foreign exchange contracts – purchases	1.0		1.2	Cost of goods sold	0.1		0.5
	Foreign exchange contracts – sales	7.4		4.8	Net sales	2.3		1.5
	Interest rate swap contracts	-13.3		-7.9	Interest expense	-		-
	Total	($7.60)		($1.30)		$		$
						0.9		2.7
		(a)		As of March 31, 2015 the amount of existing gains in AOCI expected to be recognized in earnings over the next twelve months is $0.6 million.
		Location of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) (a)
	Derivatives in Cash Flow Hedging Relationships
	Natural gas commodity contracts	Cost of goods sold
	Foreign exchange contracts – purchases and sales	SG&A expense
	Interest rate swap contracts	Interest expense
		(a)		The amount recognized in income related to the ineffective portion of the hedging relationships was immaterial for the first quarters of 2015 and 2014.  No gains or losses are excluded from the assessment of the hedge effectiveness.
	The amount of pre-tax gain recognized in income for derivative instruments not designated as hedging instruments was $0.1 million and $2.7 million for the first quarters of 2015 and 2014, respectively.

Product_Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2015
Product Warranties [Abstract]
Product Warranties	NOTE 13.  PRODUCT WARRANTIES
	We provide direct customer and end-user warranties for our products.  These warranties cover manufacturing defects that would prevent the product from performing in line with its intended and marketed use.  The terms of these warranties vary by product.  We collect and analyze warranty claims data with a focus on the historic amount of claims, the products involved, the amount of time between the warranty claims and their respective sales and the amount of current sales.  The following table summarizes the activity for the accrual of product warranties for the first three months of 2015 and 2014:
		2015	2014
	Balance at January 1,	$	$
		7.9	7.4
	Reductions for payments	-3.1	-2.9
	Current year warranty accruals	2.7	2.3
	Balance at March 31,	$	$
		7.5	6.8
	The warranty provision and related reserve are recorded as a reduction of sales and accounts receivable, respectively.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income	NOTE 14. ACCUMULATED OTHER COMPREHENSIVE INCOME
		Foreign Currency Translation Adjustments (1)	Derivative Adjustments (1)	Pension and Postretirement Adjustments (1)	Total Accumulated Other Comprehensive Loss (1)
	Balance, December 31, 2014	($8.30)	($4.00)	($483.20)	($495.50)
	Other comprehensive (loss) income before reclassifications, net of tax (expense) benefit of $ -, $0.3,  ($0.2), and $0.1	-15.3	0.1	0.7	-14.5
	Amounts reclassified from accumulated other comprehensive (loss)	-	-0.6	11.2	10.6
	Net current period other comprehensive (loss) income	-15.3	-0.5	11.9	-3.9
	Balance at March 31, 2015	($23.60)	($4.50)	($471.30)	($499.40)
		Foreign Currency Translation Adjustments (1)	Derivative Adjustments (1)	Pension and Postretirement Adjustments (1)	Total Accumulated Other Comprehensive Loss (1)
	Balance, December 31, 2013	$	($0.70)	($392.20)	($371.60)
		21.3
	Other comprehensive (loss) income before reclassifications, net of tax (expense) of $ -, ($1.8),  ($0.1), and ($1.9)	-0.4	1.2	0.3	1.1
	Amounts reclassified from accumulated other comprehensive (loss) income	-	-1.8	6.8	5.0
	Net current period other comprehensive (loss) income	-0.4	-0.6	7.1	6.1
	Balance at March 31, 2014	$	($1.30)	($385.10)	($365.50)
		20.9
	(1) Amounts are net of tax
		Amounts Reclassified from Accumulated Other Comprehensive Income		Affected Line Item in the Condensed Consolidated Statement of Earnings and Comprehensive Income
		Three Months Ended March 31,
		2015	2014
	Derivative Adjustments:
	Natural gas commodity contracts	$	($0.70)	Cost of goods sold
		1.5
	Foreign exchange contracts - purchases	-0.1	-0.5	Cost of goods sold
	Foreign exchange contracts - sales	-2.3	-1.5	Net sales
	Total income before tax	-0.9	-2.7
	Tax impact	0.3	0.9	Income tax expense
	Total income, net of tax	-0.6	-1.8
	Pension and Postretirement Adjustments:
	Prior service cost amortization	0.1	0.2	Cost of goods sold
	Prior service cost amortization	0.2	0.2	SG&A expense
	Amortization of net actuarial loss	8.9	5.4	Cost of goods sold
	Amortization of net actuarial loss	8.1	4.7	SG&A expense
	Total expense before tax	17.3	10.5
	Tax impact	-6.1	-3.7	Income tax expense
	Total expense, net of tax	11.2	6.8
	Total reclassifications for the period	$	$
		10.6	5.0

Litigation_And_Related_Matters

Litigation And Related Matters	3 Months Ended
	Mar. 31, 2015
Litigation And Related Matters [Abstract]
Litigation And Related Matters	NOTE 15. LITIGATION AND RELATED MATTERS
	ENVIRONMENTAL MATTERS
	Environmental Compliance
	Our manufacturing and research facilities are affected by various federal, state and local requirements relating to the discharge of materials and the protection of the environment.  We make expenditures necessary for compliance with applicable environmental requirements at each of our operating facilities.  These regulatory requirements continually change, therefore we cannot predict with certainty future expenditures associated with compliance with environmental requirements.
	Environmental Sites
	Summary
	We are actively involved in the investigation, closure and/or remediation of existing or potential environmental contamination under the Comprehensive Environmental Response, Compensation and Liability Act, and state or international Superfund and similar type environmental laws at several domestically- and internationally-owned, formerly owned and non-owned locations allegedly resulting from past industrial activity.  In a few cases, we are one of several potentially responsible parties and have agreed to jointly fund the required investigation and remediation, while preserving our defenses to the liability.  We may also have rights of contribution or reimbursement from other parties or coverage under applicable insurance policies.  We are currently pursuing coverage and recoveries under those policies with respect to certain of the sites, but we are unable to predict the outcome or costs of these proceedings.
	Estimates of our future liability at the environmental sites are based on evaluations of currently available facts regarding each individual site.  We consider factors such as our activities associated with the site, existing technology, presently enacted laws and regulations and prior company experience in remediating contaminated sites.  Although current law imposes joint and several liability on all parties at Superfund sites, our contribution to the remediation of these sites is expected to be limited by the number of other companies potentially liable for site remediation.  As a result, our estimated liability reflects only our expected share.  In determining the probability of contribution, we consider the solvency of other parties, the site activities of other parties, whether liability is being disputed, the terms of any existing agreements and experience with similar matters, and the effect of our Chapter 11 reorganization upon the validity of the claim.
	Specific Material Events
	St Helens, OR
	In August 2010, we entered into a Consent Order (the “Consent Order”) with the Oregon Department of Environmental Quality (“ODEQ”), along with Kaiser Gypsum Company, Inc. (“Kaiser”), and Owens Corning Sales LLC (“OC”), with respect to our St. Helens, OR Building Products facility, which was previously owned by Kaiser and then OC.  The Consent Order, which replaces a previous order of the ODEQ requiring us to investigate and remediate hazardous substances present at the facility, requires that we and Kaiser complete a remedial investigation and feasibility study (“RI/FS”) on the portion of the site owned by us (“Owned Property”), which is comprised of Upland and Lowland areas.  The Consent Order further requires us, Kaiser and OC to conduct an RI/FS in the In-Water area of the adjacent Scappoose Bay.  We are currently in an investigation phase for both the Owned Property and the Scappoose Bay and are working with ODEQ, Kaiser and OC to finalize the reports to move to the Feasibility Study phase.  We have determined that it is probable that remedial action for certain portions of the Owned Property will be required.  The current estimate of our future liability at the site includes the known investigation work required by the Consent Order and the current projected cost of possible remedies for certain portions of the Owned Property.  At this time, we are unable to reasonably estimate any remediation costs that we may ultimately incur with respect to other portions of the Owned Property or the Scappoose Bay, although such costs may be material.  If additional investigative or remedial action is required by ODEQ, it could result in additional costs greater than the amounts currently estimated and those costs may be material.
	Costs and responsibilities for investigation, including the current RI/FS for the Owned Property continue to be shared with Kaiser pursuant to a cost sharing agreement with Kaiser.  Contemporaneously with the execution of the Consent Order, we, Kaiser and OC also entered into a separate cost sharing agreement for both the investigation and possible remediation of the Scappoose Bay. Kaiser’s shares under the cost sharing agreements are being funded by certain insurance policies, which comprise substantially all of Kaiser’s assets. If Kaiser and OC are unwilling or unable to fulfill their obligations under the cost sharing agreements, or seek to contest or challenge the allocations, or if Kaiser’s insurance policies are unable to fund Kaiser’s shares, it could result in additional cost to us greater than the amounts currently estimated and those costs may be material.
	The principal contaminants at the St. Helens site are arsenic and dioxin compounds from historic operations by prior owners of the plant.  As part of the investigation on the site pursuant to the Consent Order, we conducted an analysis of the raw materials used in our manufacturing processes at the St. Helens facility to identify possible sources of these same contaminants. Our testing found low levels of naturally occurring dioxin in sourced clay, known as ball clay, used in the production of some of our fire-retardant products at our St. Helens manufacturing facility. Based on the data from the soil and sediment samples from our St. Helens property and the data from the ball clay, we do not believe that the presence of dioxin in our raw material will have a material impact on our ultimate liability at the site. In addition, consistent with our health and safety policies, we tested employee exposure levels at two facilities representative of our handling procedures at all plants that use this ball clay and, as a result of such testing, do not believe that the ball clay poses a hazard to our employees based on applicable regulatory standards.  Based on the manufacturing process and the amount of raw material utilized, we also believe that the dioxin levels in our finished products do not pose a hazard to installers or consumers. While we have not received any claims related to this raw material or our fire-retardant products, there can be no assurance that the raw material or the finished products will not become the subject of legal claims or regulatory actions or that such claims or actions will not have a material adverse effect on our financial condition or results of operations.
	Macon, GA
	The U.S. Environmental Protection Agency (“EPA”) has listed two landfills located on a portion of our Building Products facility in Macon, GA, along with the former Macon Naval Ordnance Plant landfill adjacent to our property, and portions of Rocky Creek (collectively, the “Macon Site”) as a Superfund site on the National Priorities List due to the presence of contaminants, most notably PCBs.
	In September 2010, we entered into an Administrative Order on Consent for a Removal Action with the EPA to investigate PCB contamination in one of the landfills on our property, the Wastewater Treatment Plant Landfill (the “WWTP Landfill”).  We concluded the investigative phase of the Removal Action for the WWTP Landfill and submitted our final Engineering Evaluation/Cost Analysis (“EE/CA”) to the EPA in 2013.  The EPA subsequently approved the EE/CA and issued an Action Memorandum in July 2013 selecting our recommended remedy for the Removal Action.  In July 2014, we entered into an Administrative Order on Consent for Removal Action with the EPA for the WWTP Landfill.  The EPA approved the Removal Action Work Plan on March 30, 2015 and the removal work will commence in 2015.  Our estimate of future liability includes estimated costs for the Removal Action for the WWTP Landfill.
	It is probable that we will incur field investigation, engineering and oversight costs associated with a RI/FS with respect to the remainder of the Superfund site, which includes the other landfill on our property, as well as areas on and adjacent to Armstrong’s property and Rocky Creek (the “Remaining Site”).  We have not yet entered into an Order with the EPA for the Remaining Site and, as a result, have not yet commenced an investigation of this portion of the site.  Accordingly, we are able to estimate only a small portion of the probable costs that may be associated with the RI/FS for the Remaining Site.  We anticipate, however, that the EPA may require significant investigative work for the Remaining Site and that we may ultimately incur costs in remediating any contamination discovered during the RI/FS.  We are unable to reasonably estimate the total costs associated with the investigation work or any resulting remediation therefrom, although such amounts may be material.
	Elizabeth City, NC
	This site is a former cabinet manufacturing facility that was operated by Triangle Pacific Corporation, now known as Armstrong Wood Products, Inc. (“Triangle Pacific”) from 1977 until 1996.  The site was formerly owned by the U.S. Navy (“Navy”) and Westinghouse, now CBS Corporation (“CBS”).  We assumed ownership of the site when we acquired the stock of Triangle Pacific in 1998. Prior to our acquisition, the NC Department of Environment and Natural Resources listed the site as a hazardous waste site.  In 1997, Triangle Pacific entered into a cost sharing agreement with Westinghouse whereby the parties agreed to share equally in costs associated with investigation and potential remediation.  In 2000, we and CBS entered into an RI/FS with the EPA for the site.  In 2007, we and CBS entered into an agreement with the Navy whereby the Navy agreed to pay one third of defined past and future investigative costs up to a certain amount, which has now been exhausted.   Although the parties initially submitted the RI/FS work plan to the EPA in 2004, the EPA did not approve the RI/FS work plan until August 2011. We submitted the draft Remedial Investigative and Risk Assessments in the first quarter of 2014, conducted supplemental investigative work based upon agency comments to those reports and are awaiting further agency comment. We are unable to reasonably estimate any additional investigative costs or determine whether remediation will be required. If remediation is required, the related costs may be material, although we expect these costs to be shared with CBS and the Navy.
	Summary of Financial Position
	Liabilities of $4.3 million at March 31, 2015 and  $4.4 million at December 31, 2014 were recorded for potential environmental liabilities, on a global basis, that we consider probable and for which a reasonable estimate of the probable liability could be made.  Where existing data is sufficient to estimate the liability, that estimate has been used; where only a range of probable liabilities is available and no amount within that range is more likely than any other, the lower end of the range has been used.  As assessments and remediation activities progress at each site, these liabilities are reviewed to reflect new information as it becomes available.  These liabilities are undiscounted.
	The estimated liabilities above do not take into account any claims for recoveries from insurance or third parties.  It is our policy to record probable recoveries that are either available through settlement or anticipated to be recovered through negotiation or litigation as assets in the Condensed Consolidated Balance Sheets.  No material amounts were recorded for probable recoveries at March 31, 2015 or December 31, 2014.
	Actual costs to be incurred at identified sites may vary from our estimates.  Based on our knowledge of the identified sites, it is not possible to reasonably estimate future costs in excess of amounts already recognized.
	ANTIDUMPING AND COUNTERVAILING DUTY CASES
	In October 2010, a coalition of U.S. producers of multilayered wood flooring (not including Armstrong) filed petitions seeking antidumping (“AD”) and countervailing duties (“CVD”) with the United States Department of Commerce (“DOC”) and the United States International Trade Commission (“ITC”) against imports of multilayered hardwood flooring from China.  The AD petition requested duties of up to 269% on imports of multilayered hardwood flooring, which it claimed were needed to offset unfair pricing from Chinese imports that injure the U.S. industry.  The CVD petition requested an unspecified level of duties be imposed on importers to offset alleged unfair subsidies provided by the Chinese government.
	We produce multilayered wood flooring domestically and import multilayered wood flooring from third party suppliers in China.  Until October 2014, we also operated a plant in Kunshan China (“Armstrong Kunshan”) that manufactured multilayered wood flooring for export to the U.S.  We were specifically mentioned in the earlier AD and CVD petitions as an importer.  Under the U.S. AD and CVD laws, a U.S. importer may ultimately be responsible for the payment of any antidumping and countervailing duties.
	In response to the petitions, the DOC conducted its initial original investigations and issued CVD and AD orders in December 2011. Pursuant to the orders, Armstrong Kunshan’s final initial rates were 1.5% (CVD) and 3.31% (AD).  These rates became effective in the form of additional duty deposits and applied retroactively as of April 6, 2011 (CVD) and May 26, 2011 (AD).
	Following the issuance of the CVD and AD orders, appeals were filed by several parties challenging various aspects of the determinations by both the DOC and the ITC, including certain aspects that may impact the validity of the orders and the applicable rates. We are participating in the last remaining appeal of the original investigation, which is expected to result in an additional court decision and orders in 2015.  The most recent court decision, on January 23, 2015, upheld DOC’s latest determination to apply an AD rate to us and the other “separate rate” respondents in the original investigation.
	Additionally, the DOC is currently conducting annual administrative reviews of the CVD and AD final rates. In 2013, in connection with the first annual administrative review, Armstrong Kunshan was selected for individual review as a mandatory respondent. As a result of its review, Armstrong Kushan received a final AD rate of 0.00% and a final CVD rate of 0.98%, effective May 9, 2014 and August 4, 2014, respectively. As a result, Armstrong Kushan’s individual AD and CVD rates applied retrospectively to the DOC’s preliminary determinations in the original investigation. We expect to receive a partial refund in 2015 of amounts earlier deposited that were covered by the first DOC administrative review.
	The DOC is currently conducting its second and third annual administrative reviews.  The second administrative reviews are scheduled for final determination in 2015. Armstrong Kunshan was not selected as a mandatory respondent for either the second or third AD reviews and therefore, is not subject to individual mandatory review. As part of these reviews, Armstrong Kunshan’s individual CVD and AD assessment rates may be changed and the revised rates applicable to participants that were not individually reviewed will apply to imports of multilayered wood flooring made between December 1, 2012 and November 30, 2013 (AD) and between January 1, 2012 and December 31, 2012 (CVD) for the second reviews and between December 1, 2013 and November 30, 2014 (AD) and between January 1, 2013 and December 31, 2013 (CVD) for the third reviews.
	On January 9, 2015, the DOC issued a preliminary AD determination for the second administrative review. It claimed a preliminary dumping rate of 18.27% by a single mandatory respondent and then preliminarily assigned this rate to all “separate rate respondents” that were not individually investigated, including Armstrong Kunshan. On January 7, 2015, the DOC issued a preliminary “All Others” CVD rate of 0.97% that also preliminarily applies to Armstrong Kunshan as part of the second CVD administrative review. These preliminary review rates are estimates only and do not change the currently applicable deposit rates. We expect that the DOC will issue final AD and CVD rates for the second administrative reviews in mid-2015. While we are unable to predict the final rates, if the final determination in the second AD review remains at or near the preliminary rate claimed by the DOC and such rate is ultimately upheld after all court appeals are exhausted, the estimated additional liability for the relevant period is approximately $5 to $7 million.
	OTHER CLAIMS
	We are involved in various lawsuits, claims, investigations and other legal matters from time to time that arise in the ordinary course of conducting business, including matters involving our products, intellectual property, relationships with suppliers, distributors, relationships with competitors, employees and other matters.  While complete assurance cannot be given to the outcome of these proceedings, we do not believe that any of these matters, individually or in the aggregate, will have a material adverse effect on our financial condition, liquidity or results of operations.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 16.  EARNINGS PER SHARE
	Earnings per share (“EPS”) components may not add due to rounding.
	The following table is a reconciliation of earnings to earnings attributable to common shares used in our basic and diluted EPS calculations for the three month periods ended March 31, 2015 and 2014:
		Three Months Ended
		March 31,
		2015	2014
	Earnings from continuing operations	$	$
		3.8	18.1
	Earnings allocated to participating non-vested
	share awards	-	-0.1
	Earnings from continuing operations attributable
	common shares	$	$
		3.8	18.0
	The following table is a reconciliation of basic shares outstanding to diluted shares outstanding for the three month periods ended March 31, 2015 and 2014 (shares in millions):
		Three Months Ended
		March 31,
		2015	2014
	Basic shares outstanding	55.3	54.8
	Dilutive effect of stock option awards	0.4	0.5
	Diluted shares outstanding	55.7	55.3
	At March 31, 2015 and 2014, there were 276,324 and zero anti-dilutive options excluded from the computation of diluted EPS, respectively.

Segment_Results_Tables

Segment Results (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Results [Abstract]
Schedule Of Net Sales To External Customers
		Three Months Ended
		March 31,
		2015	2014
	Net sales to external customers
	Building Products	$	$
		292.0	308.2
	Resilient Flooring	156.8	163.7
	Wood Flooring	102.6	118.1
	Total net sales to external customers	$	$
		551.4	590.0
Schedule Of Segment Operating Income (Loss)
		Three Months Ended
		March 31,
		2015	2014
	Segment operating income (loss)
	Building Products	$	$
		59.8	57.8
	Resilient Flooring	5.9	10.4
	Wood Flooring	-1.2	5.1
	Unallocated Corporate	-28.7	-19.5
	Total consolidated operating income	$	$
		35.8	53.8
Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes
		Three Months Ended
		March 31,
		2015	2014
	Total consolidated operating income	$	$
		35.8	53.8
	Interest expense	11.2	11.6
	Other non-operating expense	1.3	5.4
	Other non-operating income	-0.6	-0.6
	Earnings from continuing operations before income taxes	$	$
		23.9	37.4
Reconciliation Of Total Segment Assets To Total Consolidated Assets
		31-Mar-15	31-Dec-14
	Segment assets
	Building Products	$	$
		1,069.1	1,079.7
	Resilient Flooring	510.4	492.7
	Wood Flooring	342.5	329.8
	Unallocated Corporate	651.8	704.0
	Total consolidated assets	$	$
		2,573.8	2,606.2

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations [Abstract]
Summary Of Results Of Discontinued Operations
		Three Months Ended
		31-Mar-15
	Loss before income tax	($0.60)
	Income tax benefit	43.4
	Net earnings from disposal of discontinued business	$
		42.8
		Three Months Ended
		31-Mar-14
	Net Sales	$
		44.4
	Loss before income tax	-1.2
	Income tax benefit	-
	Net loss from discontinued operations	($1.20)

Accounts_And_Notes_Receivable_

Accounts And Notes Receivable (Tables)	3 Months Ended
	Mar. 31, 2015
Accounts And Notes Receivable [Abstract]
Schedule Of Accounts And Notes Receivable
		31-Mar-15	31-Dec-14
	Customer receivables	$	$
		229.1	209.7
	Customer notes	2.2	1.3
	Miscellaneous receivables	8.8	9.3
	Less allowance for warranties, discounts and losses	-24.3	-25.1
	Accounts and notes receivable, net	$	$
		215.8	195.2

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventories [Abstract]
Schedule Of Inventories
		31-Mar-15	31-Dec-14
	Finished goods	$	$
		250.1	243.2
	Goods in process	26.0	23.0
	Raw materials and supplies	138.9	133.9
	Less LIFO and other reserves	-63.6	-64.6
	Total inventories, net	$	$
		351.4	335.5

Other_Current_Assets_Tables

Other Current Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Other Current Assets [Abstract]
Schedule Of Other Current Assets
		31-Mar-15	31-Dec-14
	Prepaid expenses	$	$
		42.6	47.6
	Fair value of derivative assets	7.6	5.7
	Other	7.7	5.5
	Total other current assets	$	$
		57.9	58.8

Equity_Investments_Tables

Equity Investments (Tables)	3 Months Ended
	Mar. 31, 2015
Equity Investments [Abstract]
Summary Of Investment In Joint Venture, Income Statement Data
		Three Months Ended
		March 31,
		2015	2014
	Net sales	$	$
		86.6	92.3
	Gross profit	40.8	43.5
	Net earnings	30.5	32.2

Intangible_Assets_Tables

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Intangible Assets [Abstract]
Schedule Of Intangible Assets
			31-Mar-15		31-Dec-14
		Estimated Useful Life	Gross Carrying Amount	Accumulated Amortization	Gross Carrying Amount	Accumulated Amortization
	Amortizing intangible assets
	Customer relationships	20 years	$	$	$	$
			165.4	70.5	165.4	68.4
	Developed technology	15 years	86.1	46.6	84.9	45.1
	Other	Various	21.1	2.4	21.3	2.4
	Total		$	$	$	$
			272.6	119.5	271.6	115.9
	Non-amortizing intangible assets
	Trademarks and brand names	Indefinite	346.4		345.7
	Total intangible assets		$		$
			619.0		617.3
Schedule Of Amortization Expense
		Three Months Ended
		March 31,
		2015	2014
	Amortization expense	$	$
		3.6	3.6

Income_Taxes_Tables

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2015
Income Taxes [Abstract]
Schedule Of Income Tax Expense (Benefit)
		Three Months Ended
		March 31,
		2015	2014
	Earnings from continuing operations before income taxes	$	$
		23.9	37.4
	Income tax expense	20.1	19.3
	Effective tax rate	84.1%	51.6%

Pensions_And_Other_Benefit_Pro1

Pensions And Other Benefit Programs (Tables)	3 Months Ended
	Mar. 31, 2015
Pensions And Other Benefit Programs [Abstract]
Schedule Of Periodic Benefit Costs (Credits)
		Three Months Ended
		March 31,
		2015	2014
	U.S. defined-benefit plans:
	Pension benefits
	Service cost of benefits earned during the period	$	$
		4.1	3.6
	Interest cost on projected benefit obligation	20.2	21.4
	Expected return on plan assets	-35.1	-34.8
	Amortization of prior service cost	0.5	0.5
	Amortization of net actuarial loss	18.2	10.6
	Net periodic pension cost	$	$
		7.9	1.3
	Retiree health and life insurance benefits
	Service cost of benefits earned during the period	$	$
		0.2	0.2
	Interest cost on projected benefit obligation	2.0	2.7
	Amortization of prior service credit	-0.2	-0.1
	Amortization of net actuarial gain	-1.9	-1
	Net periodic postretirement benefit cost	$	$
		0.1	1.8
	Non-U.S. defined-benefit pension plans
	Service cost of benefits earned during the period	$	$
		0.6	0.6
	Interest cost on projected benefit obligation	2.1	2.7
	Expected return on plan assets	-2.3	-2.9
	Amortization of net actuarial loss	0.7	0.5
	Net periodic pension cost	$	$
		1.1	0.9

Financial_Instruments_Tables

Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Financial Instruments [Abstract]
Estimated Fair Value Of Financial Instruments
		31-Mar-15		31-Dec-14
		Carrying amount	Estimated fair value	Carrying amount	Estimated fair value
	Assets (Liabilities), net:
	Total long-term debt, including current portion	($1,035.30)	($1,032.90)	($1,042.60)	($1,028.20)
	Foreign currency contracts	8.5	8.5	5.4	5.4
	Natural gas contracts	-2.7	-2.7	-3	-3
	Interest rate swap contracts	-13.3	-13.3	-9.3	-9.3
Summary Of Assets And Liabilities
		31-Mar-15		31-Dec-14
		Fair value based on		Fair value based on
		Quoted,     active     markets	Other observable inputs	Quoted,     active     markets	Other observable inputs
		Level 1	Level 2	Level 1	Level 2
	Assets (Liabilities), net:
	Total long-term debt, including current portion	($464.30)	($568.60)	($459.80)	($568.40)
	Foreign currency contracts	8.5	-	5.4	-
	Natural gas contracts	-	-2.7	-	-3
	Interest rate swap contracts	-	-13.3	-	-9.3

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Financial Instruments [Abstract]
Summary Of Interest Rate Swaps
	Trade Date		Notional Amount		Interest Rate Paid			Coverage Period	Risk Coverage
	31-Mar-11		$100.00		2.303%			March 2011 to November 2015	Term Loan A
	31-Mar-11		$200.00		2.523%			March 2011 to November 2015	Term Loan B
	27-Mar-12		$250.00		1.928%			March 2012 to March 2018	Term Loan B
	27-Mar-12		$200.00		2.810%			November 2015 to March 2018	Term Loan B
	16-Apr-13		$250.00		1.398%			November 2015 to March 2018	Term Loan A
Summary Of The Fair Value Of Derivative Instruments On The Consolidated Balance Sheet
		Derivative Assets					Derivative Liabilities
			Fair Value					Fair Value
		Balance Sheet   Location	31-Mar-15		31-Dec-14		Balance Sheet   Location	31-Mar-15	31-Dec-14
	Derivatives designated as hedging instruments
	Natural gas commodity contracts	Other current assets	-		-		Accounts payable and accrued expenses	$	$
								2.5	3.0
	Foreign exchange contracts	Other current assets	$		$		Accounts payable and accrued expenses	1.1	0.7
			7.6		5.6
	Interest rate swap contracts	Other current assets	-		-		Accounts payable and accrued expenses	3.3	-
	Natural gas commodity contracts	Other non-current assets	-		-		Other long-term liabilities	0.2	-
	Foreign exchange contracts	Other non-current assets	2.2		0.9		Other long-term liabilities	0.2	0.1
	Interest rate swap contracts	Other non-current assets	-		1.9		Other long-term liabilities	10.0	11.2
	Total derivatives designated as hedging instruments		$		$			$	$
			9.8		8.4			17.3	15.0
Summary Of The Amount Of (Loss) Recognized In Accumulated Other Comprehensive Income
		Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (“AOCI”) (Effective Portion)(a)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
		Three Months Ended				Three Months Ended
		March 31,				March 31,
		2015		2014		2015		2014
	Derivatives in Cash Flow Hedging Relationships
	Natural gas commodity contracts	($2.70)		$	Cost of goods sold	($1.50)		$
				0.6				0.7
	Foreign exchange contracts – purchases	1.0		1.2	Cost of goods sold	0.1		0.5
	Foreign exchange contracts – sales	7.4		4.8	Net sales	2.3		1.5
	Interest rate swap contracts	-13.3		-7.9	Interest expense	-		-
	Total	($7.60)		($1.30)		$		$
						0.9		2.7
	As of March 31, 2015 the amount of existing gains in AOCI expected to be recognized in earnings over the next twelve months is $0.6 million.

Product_Warranties_Tables

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2015
Product Warranties [Abstract]
Summary Of Activity For The Accrual Of Product Warranties
		2015	2014
	Balance at January 1,	$	$
		7.9	7.4
	Reductions for payments	-3.1	-2.9
	Current year warranty accruals	2.7	2.3
	Balance at March 31,	$	$
		7.5	6.8

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income [Abstract]
Components Of Accumulated Other Comprehensive Income (Loss)
		Foreign Currency Translation Adjustments (1)	Derivative Adjustments (1)	Pension and Postretirement Adjustments (1)	Total Accumulated Other Comprehensive Loss (1)
	Balance, December 31, 2014	($8.30)	($4.00)	($483.20)	($495.50)
	Other comprehensive (loss) income before reclassifications, net of tax (expense) benefit of $ -, $0.3,  ($0.2), and $0.1	-15.3	0.1	0.7	-14.5
	Amounts reclassified from accumulated other comprehensive (loss)	-	-0.6	11.2	10.6
	Net current period other comprehensive (loss) income	-15.3	-0.5	11.9	-3.9
	Balance at March 31, 2015	($23.60)	($4.50)	($471.30)	($499.40)
		Foreign Currency Translation Adjustments (1)	Derivative Adjustments (1)	Pension and Postretirement Adjustments (1)	Total Accumulated Other Comprehensive Loss (1)
	Balance, December 31, 2013	$	($0.70)	($392.20)	($371.60)
		21.3
	Other comprehensive (loss) income before reclassifications, net of tax (expense) of $ -, ($1.8),  ($0.1), and ($1.9)	-0.4	1.2	0.3	1.1
	Amounts reclassified from accumulated other comprehensive (loss) income	-	-1.8	6.8	5.0
	Net current period other comprehensive (loss) income	-0.4	-0.6	7.1	6.1
	Balance at March 31, 2014	$	($1.30)	($385.10)	($365.50)
		20.9
	(1) Amounts are net of tax
Reclassification Out Of Accumulated Other Comprehensive Income
		Amounts Reclassified from Accumulated Other Comprehensive Income		Affected Line Item in the Condensed Consolidated Statement of Earnings and Comprehensive Income
		Three Months Ended March 31,
		2015	2014
	Derivative Adjustments:
	Natural gas commodity contracts	$	($0.70)	Cost of goods sold
		1.5
	Foreign exchange contracts - purchases	-0.1	-0.5	Cost of goods sold
	Foreign exchange contracts - sales	-2.3	-1.5	Net sales
	Total income before tax	-0.9	-2.7
	Tax impact	0.3	0.9	Income tax expense
	Total income, net of tax	-0.6	-1.8
	Pension and Postretirement Adjustments:
	Prior service cost amortization	0.1	0.2	Cost of goods sold
	Prior service cost amortization	0.2	0.2	SG&A expense
	Amortization of net actuarial loss	8.9	5.4	Cost of goods sold
	Amortization of net actuarial loss	8.1	4.7	SG&A expense
	Total expense before tax	17.3	10.5
	Tax impact	-6.1	-3.7	Income tax expense
	Total expense, net of tax	11.2	6.8
	Total reclassifications for the period	$	$
		10.6	5.0

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Reconciliation Of Net Earnings To Net Earnings Attributable To Common Shares Used In Basic And Diluted Calculation
		Three Months Ended
		March 31,
		2015	2014
	Earnings from continuing operations	$	$
		3.8	18.1
	Earnings allocated to participating non-vested
	share awards	-	-0.1
	Earnings from continuing operations attributable
	common shares	$	$
		3.8	18.0
Reconciliation Of Basic Shares Outstanding To Diluted Shares Outstanding
		Three Months Ended
		March 31,
		2015	2014
	Basic shares outstanding	55.3	54.8
	Dilutive effect of stock option awards	0.4	0.5
	Diluted shares outstanding	55.7	55.3

Business_And_Basis_Of_Presenta1

Business And Basis Of Presentation (Details) (USD $)	3 Months Ended	27 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Business And Basis Of Presentation [Line Items]
Separation costs	4.3
Bankruptcy voluntary petition filed for relief date	1-Dec-00
Bankruptcy court where petition filed	United States Bankruptcy Court for the District of Delaware
Plan of Reorganization approved date	1-Oct-06
Entity arising from bankruptcy proceeding	Asbestos Personal Injury Settlement Trust (the "Asbestos PI Trust")
Asbestos PI Trust [Member]
Business And Basis Of Presentation [Line Items]
Sale of stock by investee	2,739,944	20,448,362
Holding percentage in Armstrong World Industries, Inc.	12.00%

Segment_Results_Schedule_Of_Ne

Segment Results (Schedule Of Net Sales To External Customers) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net sales to external customers	$551.40	$590
Building Products [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	292	308.2
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	156.8	163.7
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	$102.60	$118.10

Segment_Results_Schedule_Of_Se

Segment Results (Schedule Of Segment Operating Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Segment operating income (loss)	$35.80	$53.80
Building Products [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	59.8	57.8
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	5.9	10.4
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	-1.2	5.1
Unallocated Corporate Segment [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	($28.70)	($19.50)

Segment_Results_Reconciliation

Segment Results (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Results [Abstract]
Total consolidated operating income	$35.80	$53.80
Interest expense	11.2	11.6
Other non-operating expense	1.3	5.4
Other non-operating income	-0.6	-0.6
Earnings from continuing operations before income taxes	$23.90	$37.40

Segment_Results_Reconciliation1

Segment Results (Reconciliation Of Total Segment Assets To Total Consolidated Assets) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Segment Reporting Information [Line Items]
Total consolidated assets	$2,573.80	$2,606.20
Building Products [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,069.10	1,079.70
Resilient Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	510.4	492.7
Wood Flooring [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	342.5	329.8
Unallocated Corporate Segment [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$651.80	$704

Discontinued_Operations_Narrat

Discontinued Operations (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash income tax benefit	($43.40)
DLW [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash income tax benefit	43.4
Deconsolidation net liability	12.9
Assets removed from balance sheet	151.9
Liabilities removed from balance sheet	$164.80

Discontinued_Operations_Summar

Discontinued Operations (Summary Of Results Of Discontinued Operations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net earnings (loss) from discontinued operations	$42.80	($1.20)
Net earnings on disposal of discontinued business		-1.2
DLW [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		44.4
Loss before income tax		-1.2
Net earnings (loss) from discontinued operations		-1.2
Loss before income tax	-0.6
Income tax benefit	43.4
Net earnings on disposal of discontinued business	$42.80

Accounts_And_Notes_Receivable_1

Accounts And Notes Receivable (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Accounts And Notes Receivable [Abstract]
Customer receivables	$229.10	$209.70
Customer notes	2.2	1.3
Miscellaneous receivables	8.8	9.3
Less allowance for warranties, discounts and losses	-24.3	-25.1
Accounts and notes receivable, net	$215.80	$195.20

Inventories_Schedule_Of_Invent

Inventories (Schedule Of Inventories) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Inventories [Abstract]
Finished goods	$250.10	$243.20
Goods in process	26	23
Raw materials and supplies	138.9	133.9
Less LIFO and other reserves	-63.6	-64.6
Total inventories, net	$351.40	$335.50

Other_Current_Assets_Details

Other Current Assets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Other Current Assets [Abstract]
Prepaid expenses	$42.60	$47.60
Fair value of derivative assets	7.6	5.7
Other	7.7	5.5
Total other current assets	$57.90	$58.80

Equity_Investments_Details

Equity Investments (Details) (WAVE [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
WAVE [Member]
Schedule of Equity Method Investments [Line Items]
Net sales	$86.60	$92.30
Gross profit	40.8	43.5
Net earnings	$30.50	$32.20
Equity interest percentage	50.00%

Intangible_Assets_Schedule_Of_

Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Intangible Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	$272.60	$271.60
Amortizing intangible assets, Accumulated Amortization	119.5	115.9
Total intangible assets	619	617.3
Trademarks And Brand Names [Member]
Schedule Of Intangible Assets [Line Items]
Non-amortizing intangible assets, Estimated Useful Life	Indefinite
Non-amortizing intangible assets, Gross Carrying Amount	346.4	345.7
Customer Relationships [Member]
Schedule Of Intangible Assets [Line Items]
Amortizing intangible assets, Estimated Useful Life	20 years
Amortizing intangible assets, Gross Carrying Amount	165.4	165.4
Amortizing intangible assets, Accumulated Amortization	70.5	68.4
Developed Technology [Member]
Schedule Of Intangible Assets [Line Items]
Amortizing intangible assets, Estimated Useful Life	15 years
Amortizing intangible assets, Gross Carrying Amount	86.1	84.9
Amortizing intangible assets, Accumulated Amortization	46.6	45.1
Other [Member]
Schedule Of Intangible Assets [Line Items]
Amortizing intangible assets, Estimated Useful Life, Other	Various
Amortizing intangible assets, Gross Carrying Amount	21.1	21.3
Amortizing intangible assets, Accumulated Amortization	$2.40	$2.40

Intangible_Assets_Schedule_Of_1

Intangible Assets (Schedule Of Amortization Expense) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Intangible Assets [Abstract]
Amortization expense	$3.60	$3.60

Income_Tax_Expense_Details

Income Tax Expense (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Line Items]
Earnings from continuing operations before income taxes	$23.90	$37.40
Income tax expense	20.1	19.3
Effective tax rate	84.10%	51.60%
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$3.20

Pensions_And_Other_Benefit_Pro2

Pensions And Other Benefit Programs (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
U.S. Defined-Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	$4.10	$3.60
Interest cost on projected benefit obligation	20.2	21.4
Expected return on plan assets	-35.1	-34.8
Amortization of prior service cost	0.5	0.5
Amortization of net actuarial loss (gain)	18.2	10.6
Net periodic benefit cost	7.9	1.3
U.S. Retiree Health And Life Insurance Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	0.2	0.2
Interest cost on projected benefit obligation	2	2.7
Amortization of prior service cost	-0.2	-0.1
Amortization of net actuarial loss (gain)	-1.9	-1
Net periodic benefit cost	0.1	1.8
Non-U.S. Defined-Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	0.6	0.6
Interest cost on projected benefit obligation	2.1	2.7
Expected return on plan assets	-2.3	-2.9
Amortization of net actuarial loss (gain)	0.7	0.5
Net periodic benefit cost	$1.10	$0.90

Financial_Instruments_Estimate

Financial Instruments (Estimated Fair Value Of Financial Instruments) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	($1,035.30)	($1,042.60)
Foreign currency contract obligations	8.5	5.4
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	-1,032.90	-1,028.20
Foreign currency contract obligations	8.5	5.4
Natural Gas Commodity Contracts [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	-2.7	-3
Natural Gas Commodity Contracts [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	-2.7	-3
Interest Rate Swap Contracts [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	-13.3	-9.3
Interest Rate Swap Contracts [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	($13.30)	($9.30)

Financial_Instruments_Summary_

Financial Instruments (Summary Of Assets And Liabilities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Quoted, Active Markets Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	($464.30)	($459.80)
Foreign currency contract obligations	8.5	5.4
Other Observable Inputs Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	-568.6	-568.4
Natural gas contracts	-2.7	-3
Interest rate swap contracts	($13.30)	($9.30)

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
LIBOR floor	1.00%
Gains or losses excluded from assessment of hedge effectiveness	$0	$0
Natural Gas Commodity Contracts [Member]
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge	24 months
Notional amount	10.1		14.6
Foreign Exchange Contracts [Member] | Sales And Purchases [Member]
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge	15 months
Notional amount	101.7		102.4
Foreign Exchange Contracts [Member] | Intercompany Loans And Dividends [Member]
Derivative [Line Items]
Notional amount			21.2
Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in income for derivative instruments	0.1	2.7
Derivative Liabilities	0		0.5
Derivative Assets	$0		$0

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Summary Of Interest Rate Swaps) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
2.303% Interest Rate Swap [Member]
Derivative [Line Items]
Trade Date	31-Mar-11
Notional amount	$100
Fixed interest rate	2.30%
Coverage Period	March 2011 to November 2015
Risk Coverage	Term Loan A
2.523% Interest Rate Swap [Member]
Derivative [Line Items]
Trade Date	31-Mar-11
Notional amount	200
Fixed interest rate	2.52%
Coverage Period	March 2011 to November 2015
Risk Coverage	Term Loan B
1.928% Interest Rate Swap [Member]
Derivative [Line Items]
Trade Date	27-Mar-12
Notional amount	250
Fixed interest rate	1.93%
Coverage Period	March 2012 to March 2018
Risk Coverage	Term Loan B
2.810% Interest Rate Swap [Member]
Derivative [Line Items]
Trade Date	27-Mar-12
Notional amount	200
Fixed interest rate	2.81%
Coverage Period	November 2015 to March 2018
Risk Coverage	Term Loan B
1.398% Interest Rate Swap [Member]
Derivative [Line Items]
Trade Date	16-Apr-13
Notional amount	$250
Fixed interest rate	1.40%
Coverage Period	November 2015 to March 2018
Risk Coverage	Term Loan A

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Summary Of The Fair Value Of Derivative Instruments On The Consolidated Balance Sheet) (Details) (Designated As Hedging Instrument [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$9.80	$8.40
Derivative Liabilities, Fair Value	17.3	15
Other Current Assets [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	7.6	5.6
Other Non-Current Assets [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	2.2	0.9
Other Non-Current Assets [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value		1.9
Accounts Payable And Accrued Expenses [Member] | Natural Gas Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	2.5	3
Accounts Payable And Accrued Expenses [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	1.1	0.7
Accounts Payable And Accrued Expenses [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	3.3
Other Long-Term Liabilities [Member] | Natural Gas Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	0.2
Other Long-Term Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	0.2	0.1
Other Long-Term Liabilities [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$10	$11.20

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Summary Of The Amount Of (Loss) Recognized In Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income ("AOCI") (Effective Portion)	($7.60)	[1]	($1.30)	[1]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	0.9		2.7
(Loss) in Accumulated OCI expected to be recognized in earnings	-0.6
Natural Gas Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income ("AOCI") (Effective Portion)	-2.7	[1]	0.6	[1]
Foreign Exchange Contracts - Purchases [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income ("AOCI") (Effective Portion)	1	[1]	1.2	[1]
Foreign Exchange Contracts - Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income ("AOCI") (Effective Portion)	7.4	[1]	4.8	[1]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	2.3		1.5
Interest Rate Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income ("AOCI") (Effective Portion)	-13.3	[1]	-7.9	[1]
Cost Of Goods Sold [Member] | Natural Gas Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	-1.5		0.7
Cost Of Goods Sold [Member] | Foreign Exchange Contracts - Purchases [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$0.10		$0.50
[1]	As of March 31, 2015 the amount of existing gains in AOCI expected to be recognized in earnings over the next twelve months is $0.6 million.

Product_Warranties_Details

Product Warranties (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Product Warranties [Abstract]
Balance at beginning of period	$7.90	$7.40
Reductions for payments	-3.1	-2.9
Current year warranty accruals	2.7	2.3
Balance at end of period	$7.50	$6.80

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	($495.50)		($371.60)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	-14.5		1.1
Amounts reclassified from accumulated other comprehensive (loss) income	10.6		5
Net current period other comprehensive (loss) income	-3.9		6.1
Ending Balance	-499.4		-365.5
Other comprehensive income before reclassifications, tax (expense) benefit	0.1		-1.9
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-8.3	[1]	21.3	[1]
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	-15.3	[1]	-0.4	[1]
Net current period other comprehensive (loss) income	-15.3	[1]	-0.4	[1]
Ending Balance	-23.6	[1]	20.9	[1]
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-4	[1]	-0.7	[1]
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	0.1	[1]	1.2	[1]
Amounts reclassified from accumulated other comprehensive (loss) income	-0.6	[1]	-1.8	[1]
Net current period other comprehensive (loss) income	-0.5	[1]	-0.6	[1]
Ending Balance	-4.5	[1]	-1.3	[1]
Other comprehensive income before reclassifications, tax (expense) benefit	0.3		-1.8
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	-483.2	[1]	-392.2	[1]
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	0.7	[1]	0.3	[1]
Amounts reclassified from accumulated other comprehensive (loss) income	11.2	[1]	6.8	[1]
Net current period other comprehensive (loss) income	11.9	[1]	7.1	[1]
Ending Balance	-471.3	[1]	-385.1	[1]
Other comprehensive income before reclassifications, tax (expense) benefit	($0.20)		($0.10)
[1]	Amounts are net of tax

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Reclassification Out Of Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$421.90		$447.90
Net sales	551.4		590
Earnings from continuing operations before income taxes	23.9		37.4
Income tax expense	20.1		19.3
Earnings from continuing operations	3.8		18.1
Total reclassifications for the period	10.6		5
Derivative Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	-0.6	[1]	-1.8	[1]
Pension And Postretirement Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	11.2	[1]	6.8	[1]
Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	10.6		5
Reclassification From Accumulated Other Comprehensive Income [Member] | Derivative Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from continuing operations before income taxes	-0.9		-2.7
Income tax expense	0.3		0.9
Earnings from continuing operations	-0.6		-1.8
Reclassification From Accumulated Other Comprehensive Income [Member] | Derivative Adjustments [Member] | Natural Gas Commodity Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	1.5		-0.7
Reclassification From Accumulated Other Comprehensive Income [Member] | Derivative Adjustments [Member] | Foreign Exchange Contracts - Purchases [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	-0.1		-0.5
Reclassification From Accumulated Other Comprehensive Income [Member] | Derivative Adjustments [Member] | Foreign Exchange Contracts - Sales [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	-2.3		-1.5
Reclassification From Accumulated Other Comprehensive Income [Member] | Pension And Postretirement Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from continuing operations before income taxes	17.3		10.5
Income tax expense	-6.1		-3.7
Earnings from continuing operations	11.2		6.8
Reclassification From Accumulated Other Comprehensive Income [Member] | Pension And Postretirement Adjustments [Member] | Cost Of Goods Sold [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost amortization	0.1		0.2
Amortization of net actuarial loss	8.9		5.4
Reclassification From Accumulated Other Comprehensive Income [Member] | Pension And Postretirement Adjustments [Member] | SG&A Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service cost amortization	0.2		0.2
Amortization of net actuarial loss	$8.10		$4.70
[1]	Amounts are net of tax

Litigation_And_Related_Matters1

Litigation And Related Matters (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2007	Jan. 09, 2015	Jan. 07, 2015	Dec. 31, 2014	Aug. 04, 2014	9-May-14	Dec. 08, 2011	Oct. 31, 2010
	site
Loss Contingencies [Line Items]
Number of landfills listed as superfund site	2
Percentage of site costs Navy agreed to pay		33.33%
Potential environmental liabilities	$4,300,000				$4,400,000
Recorded amount for probable recoveries	0				0
Antidumping Duties			18.27%				0.00%	3.31%
Countervailing Duties				0.97%		0.98%		1.50%
Minimum [Member]
Loss Contingencies [Line Items]
Estimated additional liability	5,000,000
Maximum [Member]
Loss Contingencies [Line Items]
Antidumping Duties									269.00%
Estimated additional liability	$7,000,000

Earnings_Per_Share_Narrative_D

Earnings Per Share (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Options to purchase common stock not included in the computation of diluted EPS	276,324	0

Earnings_Per_Share_Reconciliat

Earnings Per Share (Reconciliation Of Net Earnings To Net Earnings Attributable To Common Shares Used In Basic And Diluted Calculation) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Earnings from continuing operations	$3.80	$18.10
Earnings allocated to participating non-vested share awards		-0.1
Earnings from continuing operations attributable to common shares	$3.80	$18

Earnings_Per_Share_Reconciliat1

Earnings Per Share (Reconciliation Of Basic Shares Outstanding To Diluted Shares Outstanding) (Details)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Basic shares outstanding	55.3	54.8
Dilutive effect of stock option awards	0.4	0.5
Diluted shares outstanding	55.7	55.3

Uncategorized_Items

Uncategorized Items	12/31/15
	USD ($)
[awi_CashAndCashEquivalentsAtCarryingValueDiscontinuedOperations]	2,700,000