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Leases - Schedule of Future Minimum Lease Payments under Non-cancelable Rental and Lease Agreements (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 11.5
2020 8.8
2021 7.0
2022 4.8
2023 3.9
Thereafter 8.0
Total minimum lease payments $ 44.0