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Goodwill and Identifiable Intangible Assets - Remaining Estimated Future Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]    
2015 $ 86.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 84.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 77.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 65.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Thereafter 307.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Intangible assets with definite life, Net $ 621.1us-gaap_FiniteLivedIntangibleAssetsNet $ 765.8us-gaap_FiniteLivedIntangibleAssetsNet