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Commitments and Contingencies - Maturities of Operating Lease Liabilities (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2020 $ 7.8
2021 14.8
2022 13.5
2023 12.4
2024 12.1
Thereafter 19.3
Total lease payments $ 79.9