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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 3.5 | $ 3.9
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | 3.6 |
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | $ 1.1 |

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