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Leases (Maturities of Lease Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Mar. 31, 2020
Operating Leases    
Three months ending March 31, 2021 $ 13.5  
2022 40.9  
2023 37.5  
2024 25.3  
2025 15.0  
Thereafter 49.4  
Total lease payments 181.6  
Less imputed interest (18.9)  
Total 162.7 $ 164.9
Finance Leases    
Three months ending March 31, 2021 0.4  
2022 0.0  
2023 0.0  
2024 0.0  
2025 0.0  
Thereafter 0.0  
Total lease payments 0.4  
Less imputed interest 0.0  
Total $ 0.4 $ 42.4