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Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Schedule Of Intangible Assets [Line Items]    
Amortizing intangible assets, Gross Carrying Amount $ 272.6us-gaap_FiniteLivedIntangibleAssetsGross $ 271.6us-gaap_FiniteLivedIntangibleAssetsGross
Amortizing intangible assets, Accumulated Amortization 119.5us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 115.9us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total intangible assets 619.0us-gaap_IntangibleAssetsGrossExcludingGoodwill 617.3us-gaap_IntangibleAssetsGrossExcludingGoodwill
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 346.4us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= awi_TrademarksAndBrandNamesMember
345.7us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= awi_TrademarksAndBrandNamesMember
Customer Relationships [Member]    
Schedule Of Intangible Assets [Line Items]    
Amortizing intangible assets, Estimated Useful Life 20 years  
Amortizing intangible assets, Gross Carrying Amount 165.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
165.4us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Amortizing intangible assets, Accumulated Amortization 70.5us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
68.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Developed Technology [Member]    
Schedule Of Intangible Assets [Line Items]    
Amortizing intangible assets, Estimated Useful Life 15 years  
Amortizing intangible assets, Gross Carrying Amount 86.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
84.9us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Amortizing intangible assets, Accumulated Amortization 46.6us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
45.1us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Other [Member]    
Schedule Of Intangible Assets [Line Items]    
Amortizing intangible assets, Estimated Useful Life, Other Various  
Amortizing intangible assets, Gross Carrying Amount 21.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
21.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Amortizing intangible assets, Accumulated Amortization $ 2.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
$ 2.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember