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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

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