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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 6.3 | $ 4.2
Expected contributions in next twelve months | 4.5 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2024 | 19.2 |
2025 | 19.4 |
2026 | 19.5 |
2027 | 19.3 |
2028 | 19.5 |
2029 – 2033 | 95.9 |
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 6.4 | $ 5.9
Expected contributions in next twelve months | 6.5 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2024 | 6.5 |
2025 | 6.4 |
2026 | 6.4 |
2027 | 6.4 |
2028 | 6.2 |
2029 – 2033 | $ 29.1 |

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