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Leases - Balance Sheet Effect (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease right-of-use assets $ 227.2  
Finance lease assets 55.4  
Total leased assets 282.6  
Operating lease obligations 49.7 $ 0.0
Finance lease obligations 8.0  
Long-term operating lease obligations 186.2  
Finance lease obligations 57.0  
Present value of lease obligations $ 300.9