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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, 2019
Mar. 31, 2018
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 0.4 $ 1.1
Interest cost 7.1 6.9
Expected asset return (10.3) (11.5)
Amortized loss 1.5 2.2
Curtailment 0.0 3.2
Net periodic benefit cost (credit) (1.3) 1.9
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 3.2 3.1
Amortized loss 0.0 0.2
Amortized prior service credit (0.4) (0.7)
Net periodic benefit cost $ 2.9 $ 2.7