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Pension and Other Post-Retirement Benefits - Pension Obligations, Plan Assets, and Other Post-retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in Benefit Obligation |  |  |
Service cost | $ 6.2 | $ 5.4 | $ 7.9
Change in Fair Value of Plan Assets |  |  |
Plan assets at beginning of year | 328.8 |  |
Plan assets at end of year | 325.0 | 328.8 |
Amount Recognized |  |  |
Other liabilities | (38.5) | (47.0) |
Defined Benefit Pension [Member] |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 346.9 | 341.8 |
Service cost | 6.1 | 5.3 | 7.7
Interest cost | 16.4 | 16.6 | 10.1
Plan amendments | 0.0 | 0.5 |
Actuarial loss | 14.9 | (12.4) |
Benefits paid | 24.3 | 30.8 |
Effect of foreign exchange rate changes | (0.5) | 1.1 |
Benefit obligation at end of year | 329.7 | 346.9 | 341.8
Change in Fair Value of Plan Assets |  |  |
Plan assets at beginning of year | 328.8 | 323.8 |
Actual return on plan assets | 19.6 | 29.1 |
Effect of exchange rate changes | (0.4) | 1.4 |
Company contributions | 1.3 | 5.3 |
Benefits paid | (24.3) | (30.8) |
Plan assets at end of year | 325.0 | 328.8 | 323.8
Funded Status at end of year | (4.7) | (18.1) |
Amount Recognized |  |  |
Other liabilities | (4.7) | (18.1) |
Accumulative other comprehensive loss: |  |  |
Net actuarial loss | 58.0 | 72.0 |
Prior service credit (cost) | 0.5 | 0.6 |
Accumulated other comprehensive loss | 58.5 | 72.6 |
Defined Benefit Plan, Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss) | 53.8 | 54.5 |
After-tax amount recognized in accumulated other comprehensive loss | 46.2 | 56.8 |
Retiree Health and Life [Member] |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 14.9 | 15.6 |
Service cost | 0.1 | 0.1 | 0.2
Interest cost | 0.7 | 0.8 | 0.4
Actuarial loss | 1.0 | (0.2) |
Benefits paid | 1.6 | 1.8 |
Effect of foreign exchange rate changes | 0.0 | 0.0 |
Benefit obligation at end of year | 13.1 | 14.9 | 15.6
Change in Fair Value of Plan Assets |  |  |
Plan assets at beginning of year | 0.0 | 0.0 |
Actual return on plan assets | 0.0 | 0.0 |
Effect of exchange rate changes | 0.0 | 0.0 |
Company contributions | 1.6 | 1.8 |
Benefits paid | (1.6) | (1.8) |
Plan assets at end of year | 0.0 | 0.0 | $ 0.0
Funded Status at end of year | (13.1) | (14.9) |
Amount Recognized |  |  |
Other liabilities | (13.1) | (14.9) |
Accumulative other comprehensive loss: |  |  |
Net actuarial loss | (7.1) | (6.7) |
Prior service credit (cost) | 0.0 | (0.2) |
Accumulated other comprehensive loss | (7.1) | (6.9) |
Defined Benefit Plan, Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income (Loss) | (20.2) | (21.8) |
After-tax amount recognized in accumulated other comprehensive loss | $ (5.6) | $ (5.4) |

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