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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, 2018
Mar. 31, 2017
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 1.1 $ 0.8
Interest cost 6.9 6.8
Expected asset return (11.5) (10.5)
Amortized loss 2.2 1.7
Curtailment 3.2 0.0
Net periodic benefit cost (credit) 1.9 (1.2)
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 0.1 0.1
Interest cost 3.1 3.3
Amortized loss 0.2 0.2
Amortized prior service credit (0.7) (0.7)
Net periodic benefit cost 2.7 $ 2.9
Other Operating Income (Expense) [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Components of net periodic benefit cost other than service cost $ 0.2