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Commitments and Contingencies - Maturities of Operating Lease Liabilities (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2020 $ 11.9
2021 14.9
2022 13.7
2023 12.6
2024 12.3
Thereafter 19.3
Total lease payments $ 84.7