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Leases Schedule of Operating Lease Liability Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Remainder of 2019 $ 9.9  
2020 17.7  
2021 16.0  
2022 12.6  
2023 8.8  
2024 and Thereafter 19.0  
Total undiscounted lease payments 84.0  
Present value adjustment (16.4)  
Operating lease liabilities $ 67.6 $ 55.6