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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2022
Apr. 30, 2021
Sep. 30, 2021
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]            
Net periodic pension and retiree medical income $ (1.4) $ (2.4) $ (4.1) $ (5.4)   $ (8.1)
Defined Benefit Plan, Interest Cost 1.6 3.8 5.6 6.6   11.1
Defined Benefit Plan, Amortization of Gain (Loss) 0.0 0.0 (0.1) 0.1 $ 0.0 (0.1)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets $ (3.0) $ (6.2) (9.6) $ (12.1)   (19.1)
Pension Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year     $ 2.3     $ 2.3