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Goodwill and Identifiable Assets - Remaining Estimated Future Amortization Expense (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 8.1  
2018 7.5  
2019 3.1  
2020 1.5  
Thereafter 10.2  
Intangible assets with definite life, Net $ 30.4 $ 31.2