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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]          
Net periodic pension and retiree medical income $ (4.0) $ (3.7) $ (5.4) $ (6.1) $ (12.1)
Defined Benefit Plan, Interest Cost 5.7 5.8 6.6 9.6 16.8
Defined Benefit Plan, Amortization of Gain (Loss)     0.1 0.0 (0.1)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (9.7) $ (9.5) $ (12.1) $ (15.7) (28.8)
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 1.7       $ 1.7