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Leases - Summary of Minimum Annual Lease Payments Under Non-Cancelable Operating Leases (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2020 $ 21.7
2021 17.0
2022 13.2
2023 10.3
2024 and thereafter 22.8
Total $ 85.0