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Asset Disposition and Impairments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 09, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]          
Proceeds from Sale of Property, Plant, and Equipment $ 63.6        
Loss on Sale of Assets and Asset Impairment Charges $ 47.1 $ 0.0 $ (0.1) $ 47.1 $ (0.1)