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Commitments and Contingencies - Future Minimum Lease Commitments Under Non-Cancelable Operating Leases (Topic 840) (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 23.2
2020 17.6
2021 13.3
2022 11.1
2023 9.5
Thereafter 13.8
Total $ 88.5