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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

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