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Schedule of Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0.8 $ 0.8 $ 1.5 $ 1.6
Interest cost 7.3 7.2 14.6 14.4
Expected asset return (10.7) (10.6) (21.4) (21.2)
Amortized loss 1.4 1.3 2.8 3.0
Net periodic benefit credit (1.2) (1.3) (2.5) (2.2)
Other Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.1 0.1 0.2 0.2
Interest cost 3.5 3.8 7.0 7.6
Amortized loss 0.1 0.2 0.2 0.4
Amortized prior service credit (0.6) (0.7) (1.3) (1.4)
Net periodic benefit cost $ 3.1 $ 3.4 $ 6.1 $ 6.8