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Commitments and Contingencies - Future Minimum Rental Payments under Non-Cancelable Operating Leases (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 37.8
2020 29.6
2021 23.4
2022 18.9
2023 13.8
Remainder 58.8
Total minimum rental payments $ 182.3