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Goodwill and Other Intangible Assets - Schedule of Estimated Annual Amortization Expense Related to Other Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite Lived Intangible Assets Roll Forward    
2015 $ 74.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 56.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 50.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 45.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 41.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
2020 and thereafter 128.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Book Value, amortizable intangible assets $ 396.9us-gaap_FiniteLivedIntangibleAssetsNet $ 297.8us-gaap_FiniteLivedIntangibleAssetsNet