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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, 2016
Mar. 31, 2015
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 0.7 $ 0.8
Interest cost 7.3 7.2
Expected asset return (10.7) (10.6)
Amortized loss 1.4 1.7
Net periodic benefit credit (1.3) (0.9)
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 3.5 3.8
Amortized loss 0.1 0.2
Amortized prior service credit (0.7) (0.7)
Net periodic benefit cost $ 3.0 $ 3.4