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Leases - Balance Sheet Effect (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease right-of-use assets $ 191.9 $ 0.0
Finance lease assets 57.2  
Total leased assets 249.1  
Operating lease obligations 40.7 0.0
Finance lease obligations 6.8  
Long-term operating lease obligations 157.2 $ 0.0
Finance lease obligations 59.0  
Present value of lease obligations $ 263.7