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Intangible Assets - Schedule Of Estimated Future Amortization Expense Of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 9.6  
2019 4.6  
2020 4.6  
2021 3.4  
2022 2.1  
2023 and thereafter 1.7  
Net Carrying Amount $ 26.0 $ 31.5