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Leases (Maturities of Lease Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Mar. 31, 2019
Operating Leases    
Three months ended March 31, 2020 $ 8.8  
Year ending March 31, 2021 35.9  
Year ending March 31, 2022 33.2  
Year ending March 31, 2023 32.5  
Year ending March 31, 2024 20.4  
Thereafter 60.4  
Total lease payments 191.2  
Less imputed interest (23.8)  
Total 167.4  
Finance Leases    
Three months ended March 31, 2020 1.6  
Year ending March 31, 2021 6.2  
Year ending March 31, 2022 3.9  
Year ending March 31, 2023 3.9  
Year ending March 31, 2024 3.9  
Thereafter 73.5  
Total lease payments 93.0  
Less imputed interest (49.8)  
Total $ 43.2 $ 45.4