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Leases (Schedule of Maturities of Operating Lease Liability) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Remainder of 2019 $ 28.7  
2020 35.7  
2021 32.5  
2022 30.0  
2022 25.0  
Thereafter 216.3  
Total minimum lease payments 368.2  
Present value adjustment (107.5)  
Total operating lease liabilities $ 260.7 $ 0.0