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Pension and Other Postretirement Benefits - Expected Contribution Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 1.9 | $ 1.8
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 1.9 | 1.8
Expected contributions in next twelve months | 1.8 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2021 | 20.8 |
2022 | 20.9 |
2023 | 20.6 |
2024 | 20.3 |
2025 | 20.2 |
2026-2030 | 99.7 |
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 5.8 | $ 5.8
Expected contributions in next twelve months | 6.4 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |
2021 | 6.4 |
2022 | 6.4 |
2023 | 6.3 |
2024 | 6.3 |
2025 | 6.2 |
2026-2030 | $ 30.1 |

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