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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 2.4 | $ 2.4
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | 3.7 |
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | $ 1.1 |

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