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Leases Schedule of Operating Lease Liability Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Remainder of 2019 $ 14.4  
2020 16.3  
2021 14.6  
2022 11.7  
2023 8.2  
2024 and Thereafter 18.9  
Total undiscounted lease payments 84.1  
Present value adjustment (17.1)  
Operating lease liabilities $ 67.0 $ 55.6