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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 2.3 | $ 6.6
Expected contributions in next twelve months | 8.0 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2025 | 20.5 |
2026 | 20.9 |
2027 | 20.9 |
2028 | 21.4 |
2029 | 21.7 |
2030 – 2034 | 94.8 |
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 5.5 | $ 6.5
Expected contributions in next twelve months | 6.4 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2025 | 6.5 |
2026 | 6.5 |
2027 | 6.5 |
2028 | 6.7 |
2029 | 6.5 |
2030 – 2034 | $ 30.9 |

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