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Goodwill and Identifiable Intangible Assets - Remaining Estimated Future Amortization Expense (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2016 $ 65.6  
2017 81.3  
2018 68.1  
2019 58.4  
Thereafter 259.1  
Intangible assets with definite life, Net $ 532.5 $ 533.2