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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 4.2 | $ 1.8
Expected contributions in next twelve months | 4.2 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2023 | 20.2 |
2024 | 19.9 |
2025 | 19.9 |
2026 | 20.0 |
2027 | 19.7 |
2028 – 2032 | 97.4 |
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 5.9 | $ 5.9
Expected contributions in next twelve months | 6.1 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2023 | 6.1 |
2024 | 6.2 |
2025 | 6.1 |
2026 | 6.0 |
2027 | 6.0 |
2028 – 2032 | $ 28.8 |

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