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Postretirement Benefit Plans - Summary of Funded Status (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0.3 | $ 0.4 | $ 0.4
Projected benefit obligation | 129.6 | 150.6 | 149.8
Funded status | (129.3) | (150.2) |
Amounts reported within: |  |  |
Non-current assets | 0.1 | 0.2 |
Accrued liabilities | (10.4) | (11.7) |
Non-current liabilities | (119.0) | (138.7) |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.3 | 0.4 |
Projected benefit obligation | 71.6 | 84.4 |
Funded status | (71.3) | (84.0) |
Amounts reported within: |  |  |
Non-current assets | 0.1 | 0.2 |
Accrued liabilities | (5.0) | (5.5) |
Non-current liabilities | (66.4) | (78.7) |
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 | 58.0 | 66.2 | $ 70.7
Funded status | (58.0) | (66.2) |
Amounts reported within: |  |  |
Non-current assets | 0.0 | 0.0 |
Accrued liabilities | (5.4) | (6.2) |
Non-current liabilities | $ (52.6) | $ (60.0) |

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