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Employee Compensation (Schedule Of Employee Compensation) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Compensation [Abstract]      
Wages, salaries and incentive compensation $ 478.4us-gaap_SalariesWagesAndOfficersCompensation $ 471.4us-gaap_SalariesWagesAndOfficersCompensation $ 453.2us-gaap_SalariesWagesAndOfficersCompensation
Payroll taxes 48.0awi_PayrollTaxes 46.4awi_PayrollTaxes 44.6awi_PayrollTaxes
Pension expense (credits), net 23.3us-gaap_PensionAndOtherPostretirementBenefitExpense 22.9us-gaap_PensionAndOtherPostretirementBenefitExpense 8.1us-gaap_PensionAndOtherPostretirementBenefitExpense
Insurance and other benefit costs 49.1us-gaap_OtherLaborRelatedExpenses 51.8us-gaap_OtherLaborRelatedExpenses 43.9us-gaap_OtherLaborRelatedExpenses
Share-based compensation 12.8awi_AllocatedAdjustedShareBasedCompensationExpense 16.5awi_AllocatedAdjustedShareBasedCompensationExpense 16.2awi_AllocatedAdjustedShareBasedCompensationExpense
Total $ 611.6us-gaap_LaborAndRelatedExpense $ 609.0us-gaap_LaborAndRelatedExpense $ 566.0us-gaap_LaborAndRelatedExpense