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Leases - Operating Lease Maturity (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
2022 $ 32.9  
2023 27.2  
2024 18.7  
2025 12.2  
2026 9.7  
Thereafter 43.3  
Total lease payments 144.0  
Less: imputed interest (7.7)  
Total operating lease liabilities $ 136.3 $ 152.1