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Other Assets - Components of Other Assets (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Intangible Assets Net Excluding Goodwill [Abstract]    
Amortization expense $ 25.6us-gaap_AmortizationOfIntangibleAssets $ 29.1us-gaap_AmortizationOfIntangibleAssets
Payment towards tax restructuring $ 20.2us-gaap_PrepaidTaxes