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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 1.8 | $ 1.9
Expected contributions in next twelve months | 4.2 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2022 | 20.7 |
2023 | 20.4 |
2024 | 20.1 |
2025 | 20.0 |
2026 | 20.1 |
2027 – 2031 | 97.6 |
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 5.9 | $ 5.8
Expected contributions in next twelve months | 6.3 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2022 | 6.3 |
2023 | 6.2 |
2024 | 6.2 |
2025 | 6.1 |
2026 | 6.0 |
2027 – 2031 | $ 29.6 |

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