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Goodwill and Identifiable Intangible Assets, Net - Remaining Estimated Future Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 11.1  
2019 8.1  
2020 5.8  
2021 5.3  
Thereafter 44.4  
Net $ 74.7 $ 31.2