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Leases - Balance Sheet Effect (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease right-of-use assets $ 228.1 $ 0.0
Finance lease assets 57.3  
Total leased assets 285.4  
Operating lease obligations 49.0 0.0
Finance lease obligations 7.5  
Long-term operating lease obligations 186.7 $ 0.0
Finance lease obligations 58.4  
Present value of lease obligations $ 301.6