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Leases - Future Minimum Lease Payments Under Finance and Operating Leases (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
Remainder of 2021 $ 6.3  
2022 24.1  
2023 21.2  
2024 15.4  
2025 10.3  
2026 and Thereafter 34.4  
Total Future Payments 111.7  
Less Imputed Interest 13.8  
Present Value of Minimum Lease Payments $ 97.9 $ 89.6