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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, 2020
Mar. 31, 2019
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 0.5 $ 0.4
Interest cost 5.4 7.1
Expected asset return (9.6) (10.3)
Amortized loss 2.1 1.5
Net periodic benefit credit (1.6) (1.3)
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 2.6 3.2
Amortized loss 0.2 0.0
Amortized prior service credit (0.4) (0.4)
Net periodic benefit cost $ 2.5 $ 2.9