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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, 2022
Mar. 31, 2021
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 0.5 $ 0.5
Interest cost 4.2 4.3
Expected asset return (8.0) (9.7)
Amortized loss 1.9 2.7
Net periodic benefit credit (1.4) (2.2)
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 2.1 2.1
Amortized loss 0.1 0.4
Amortized prior service credit (0.2) (0.4)
Net periodic benefit cost $ 2.1 $ 2.2