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Financial Instruments (Estimated Fair Value Of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments [Abstract]
Total long-term debt, including current portion, Carrying amount	$ (1,042.6)us-gaap_LongTermDebt	$ (1,066.5)us-gaap_LongTermDebt
Total long-term debt, including current portion, Estimated Fair Value	(1,028.2)us-gaap_LongTermDebtFairValue	(1,065.2)us-gaap_LongTermDebtFairValue
Foreign currency contract obligations, Carrying amount	5.4	5.2
Foreign currency contract obligations, Estimated Fair Value	5.4	(5.2)
Natural gas contracts, Carrying amount	(3.0)awi_CarryingAmountOfNaturalGasContracts	0.5awi_CarryingAmountOfNaturalGasContracts
Natural gas contracts, Estimated Fair Value	(3.0)	0.5
Interest rate swap contracts, Carrying amount	(9.3)	(7.9)
Interest rate swap contracts, Estimated Fair Value	$ (9.3)	$ (7.9)

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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