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Fair Value Measurements Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 10, 2016
Sep. 10, 2016
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Property, Plant and Equipment, Net $ 142.2 $ 148.8 $ 148.8 $ 142.2 $ 146.1
Restructuring and impairment costs 23.0 $ 0.9 13.4 65.6  
Impairment of Property and Equipment [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Restructuring and impairment costs       9.6  
Impairment of Property and Equipment [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Property, Plant and Equipment, Net $ 0.0     0.0  
Consumer Direct Operations [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Restructuring and impairment costs     $ 11.0 $ (0.7)