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Earnings Per Share (Reconciliation Of Net Earnings To Net Earnings Attributable To Common Shares Used In Basic And Diluted Calculation) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Earnings from continuing operations $ 3.8us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 18.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Earnings allocated to participating non-vested share awards   (0.1)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Earnings from continuing operations attributable to common shares $ 3.8awi_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders $ 18.0awi_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders