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Leases - Maturity of Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
2021 $ 141.0  
2022 111.5  
2023 85.9  
2024 71.5  
2025 58.7  
Thereafter 169.7  
Total undiscounted cash flows 638.3  
Less: Imputed interest (83.1)  
Lease obligations under operating leases $ 555.2 $ 536.3