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Leases - Future Payments of Lease Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Operating Leases    
2021 $ 13.6  
2022 11.4  
2023 9.1  
2024 6.9  
2025 4.1  
Thereafter 5.1  
Total future lease payments 50.2  
Less: Present values (7.1)  
Total lease liability balance 43.1  
Finance Leases    
2021 0.4  
2022 0.0  
2023 0.0  
2024 0.0  
2025 0.0  
Thereafter 0.0  
Total minimum principal and interest payments 0.4  
Less: Present values 0.0  
Total lease liability balance $ 0.4 $ 0.8