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Goodwill and Identifiable Intangible Assets, Net - Remaining Estimated Future Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 14.2  
2020 12.0  
2021 9.0  
2022 7.6  
Thereafter 50.0  
Net $ 92.8 $ 74.7