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Leases (Schedule of Maturities of Operating Lease Liability) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Remainder of 2019 $ 19.7  
2020 37.1  
2021 33.9  
2022 31.3  
2022 26.4  
Thereafter 228.1  
Total minimum lease payments 376.5  
Present value adjustment (110.3)  
Total operating lease liabilities $ 266.2 $ 0.0