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Retirement and Other Postretirement Benefit Plans - Schedule of Amounts Recognized on Balance Sheet (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Amounts recognized on the balance sheet: |  |  |  |  |
Other non-current liabilities | $ 29.9 |  | $ 29.9 |  | $ 31.9
Defined Benefit Retirement Plans | U.S. |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Accrued liabilities | 1.3 |  | 1.3 |  | 16.2
Other non-current liabilities | 2.8 |  | 2.8 |  | 3.9
Total accrued benefit | $ 4.1 |  | $ 4.1 |  | $ 20.1
Defined Benefit Plan, Tax Status [Extensible List] | Non qualified | Non qualified | Non qualified | Non qualified | Non qualified
Defined Benefit Retirement Plans | European |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Accrued liabilities | $ 1.3 |  | $ 1.3 |  | $ 1.0
Other non-current liabilities | 13.0 |  | 13.0 |  | 11.9
Total accrued benefit | 14.2 |  | 14.2 |  | 12.9
Postretirement Health Care and Life Insurance Benefit Plans |  |  |  |  |
Amounts recognized on the balance sheet: |  |  |  |  |
Accrued liabilities | 0.2 |  | 0.2 |  | 0.2
Other non-current liabilities | 0.7 |  | 0.7 |  | 0.6
Total accrued benefit | $ 0.9 |  | $ 0.9 |  | $ 0.8

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