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Leases - Schedule of Future Minimum Payment under Non-Cancellable Operating Lease Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (remainder of year) $ 5.8  
2019   $ 6.2
2020 6.7 5.0
2021 6.0 4.2
2022 3.4 3.2
2023 2.2 2.4
2024 and thereafter 21.3 21.5
Total remaining lease payments 45.4 $ 42.5
Less imputed interest 13.0  
Total lease obligations 32.4  
Less current obligations 6.8  
Operating lease liabilities $ 25.6