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Leases - Operating Lease Liability Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
2022 $ 129.3  
2023 122.9  
2024 88.3  
2025 52.9  
2026 38.1  
Thereafter 121.9  
Total lease payments 553.4  
Less: interest (35.0)  
Operating lease liabilities $ 518.4 $ 621.0