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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Shares awarded under stock-based compensation plans, excess income tax benefit $ 18.0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation $ 10.0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation $ 10.6us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation