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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Operating Leases    
2019 $ 27.0  
2020 28.0  
2021 16.5  
2022 11.9  
2023 12.2  
2024 and thereafter 12.1  
Total lease payments 107.7  
Less imputed interest (18.8)  
Total lease liabilities 88.9  
Finance Leases    
2019 28.7  
2020 8.1  
2021 0.5  
2022 0.5  
2023 0.5  
2024 and thereafter 8.7  
Total lease payments 47.0  
Less imputed interest (14.3)  
Finance Lease, Liability $ 32.7 $ 40.0