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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, 2021
Mar. 31, 2020
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 0.5 $ 0.5
Interest cost 4.3 5.4
Expected asset return (9.7) (9.6)
Amortized loss 2.7 2.1
Net periodic benefit credit (2.2) (1.6)
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 2.1 2.6
Amortized loss 0.4 0.2
Amortized prior service credit (0.4) (0.4)
Net periodic benefit cost $ 2.2 $ 2.5