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Postretirement Benefit Plans - Summary of Funded Status (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0.4 | $ 0.4 | $ 0.5
Projected benefit obligation | 150.6 | 149.8 | 214.3
Funded status | (150.2) | (149.4) |
Amounts reported within: |  |  |
Non-current assets | 0.2 | 0.2 |
Accrued liabilities | (11.7) | (12.4) |
Non-current liabilities | (138.7) | (137.2) |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.4 | 0.4 |
Projected benefit obligation | 84.4 | 79.1 |
Funded status | (84.0) | (78.7) |
Amounts reported within: |  |  |
Non-current assets | 0.2 | 0.2 |
Accrued liabilities | (5.5) | (5.6) |
Non-current liabilities | (78.7) | (73.3) |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 | 0.0
Projected benefit obligation | 66.2 | 70.7 | $ 106.4
Funded status | (66.2) | (70.7) |
Amounts reported within: |  |  |
Non-current assets | 0.0 | 0.0 |
Accrued liabilities | (6.2) | (6.8) |
Non-current liabilities | $ (60.0) | $ (63.9) |

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