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Leases Schedule of Operating Lease Liability Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Remainder of 2019 $ 5.1  
2020 18.5  
2021 16.9  
2022 13.2  
2023 9.0  
2024 and thereafter 18.9  
Total undiscounted lease payments 81.6  
Present value adjustment (15.3)  
Operating lease liabilities $ 66.3 $ 55.6