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Schedule of Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0.3 $ 0.5 $ 0.8 $ 1.4
Interest cost 6.1 4.1 18.2 12.5
Expected asset return (7.3) (8.0) (21.8) (23.8)
Amortized loss (gain) 1.0 2.0 3.1 5.8
Net periodic benefit cost (credit) 0.1 (1.4) 0.3 (4.1)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.0 0.1 0.1 0.2
Interest cost 2.6 2.1 7.6 6.3
Amortized loss (gain) (2.1) 0.2 (6.3) 0.4
Amortized prior service credit (0.2) (0.3) (0.4) (0.7)
Net periodic benefit cost $ 0.3 $ 2.1 $ 1.0 $ 6.2