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Derivative Financial Instruments (Summary Of The Fair Value Of Derivative Instruments On The Consolidated Balance Sheet) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 8.4us-gaap_DerivativeAssets $ 11.0us-gaap_DerivativeAssets
Derivative Liabilities, Fair Value 15.0us-gaap_DerivativeLiabilities 12.7us-gaap_DerivativeLiabilities
Other Current Assets [Member] | Natural Gas Commodity Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value   0.7us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Other Current Assets [Member] | Foreign Exchange Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 5.6us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
5.1us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Other Non-Current Assets [Member] | Foreign Exchange Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 0.9us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
0.6us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Other Non-Current Assets [Member] | Interest Rate Swap Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 1.9us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
4.6us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Accounts Payable And Accrued Expenses [Member] | Natural Gas Commodity Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Fair Value 3.0us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= awi_AccountsPayableAndAccruedLiabilitiesCurrentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
0.2us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= awi_AccountsPayableAndAccruedLiabilitiesCurrentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Accounts Payable And Accrued Expenses [Member] | Foreign Exchange Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Fair Value 0.7us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= awi_AccountsPayableAndAccruedLiabilitiesCurrentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
 
Other Long-Term Liabilities [Member] | Foreign Exchange Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Fair Value 0.1us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
 
Other Long-Term Liabilities [Member] | Interest Rate Swap Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Fair Value $ 11.2us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 12.5us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember