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Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 2 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Apr. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Retirement Benefits [Abstract] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0.6 | $ 22.5 |  |
Defined Benefit Plan, Plan Assets, Contributions By Employer, Related To Prior Year |  |  | $ 7.0 | $ 5.3
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | $ 1.3 |  |  |

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