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Goodwill and Identifiable Intangible Assets - Remaining Estimated Future Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 87.7  
2018 70.1  
2019 56.3  
2020 53.8  
Thereafter 191.1  
Intangible assets with definite life, Net $ 459.0 $ 533.2