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Schedule of Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 0.8 $ 0.7
Interest cost 6.8 7.3
Expected asset return (10.5) (10.7)
Amortized loss 1.7 1.4
Net periodic benefit credit (1.2) (1.3)
Other Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 0.1 0.1
Interest cost 3.3 3.5
Amortized loss 0.2 0.1
Amortized prior service credit (0.7) (0.7)
Net periodic benefit cost $ 2.9 $ 3.0