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Pension Benefits and Postretirement Benefits Other Than Pensions (Details) - Pension Plans - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Noncash settlement charge |  | $ 70.2 |
Noncash settlement charge, after tax |  | $ 55.5 |
Net assets of pension plan | $ 18.2 |  | $ 16.4
Settlement adjustment | $ 2.7 |  |

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