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Intangible Assets - Schedule Of Estimated Future Amortization Expense Of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 12.5  
2018 8.6  
2019 3.6  
2020 3.4  
2021 2.3  
2022 and thereafter 1.1  
Net Carrying Amount $ 31.5 $ 49.7