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Leases (Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Lease Assets    
Operating ROU assets $ 193.5 $ 0.0
Finance lease assets 14.6  
Total leased assets 208.1  
Current:    
Operating 42.2  
Finance 4.2  
Noncurrent:    
Operating 154.8 $ 0.0
Finance 7.9  
Total leased liabilities 209.1  
Finance lease, right-of-use asset, accumulated depreciation $ 17.9