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Pension and Other Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Pension | U.S. |  |
Actuarial gains (losses) recognized: |  |
Unrecognized amounts in AOCL at beginning of period | $ (58.3) | $ (58.9)
Reclassification adjustments | 1.0 | 1.0
Actuarial gains (losses) arising during the period | 10.7 | (0.3)
Effect of settlements | 6.5 | (0.1)
Prior service credit recognized: |  |
Reclassification adjustments | 0.0 | 0.0
Translation adjustment | 0.0 | 0.0
Amounts recognized in OCIL during the period | 18.2 | 0.6
Unrecognized amounts in AOCL at end of period | (40.1) | (58.3)
Pension | Foreign |  |
Actuarial gains (losses) recognized: |  |
Unrecognized amounts in AOCL at beginning of period | (72.1) | (61.2)
Reclassification adjustments | 1.9 | 1.9
Actuarial gains (losses) arising during the period | 3.0 | (11.0)
Effect of settlements | (0.1) | (0.4)
Prior service credit recognized: |  |
Reclassification adjustments | 0.0 | 0.0
Translation adjustment | 5.8 | (1.4)
Amounts recognized in OCIL during the period | 10.6 | (10.9)
Unrecognized amounts in AOCL at end of period | (61.5) | (72.1)
Other Postretirement | U.S. |  |
Actuarial gains (losses) recognized: |  |
Unrecognized amounts in AOCL at beginning of period | 35.1 | 39.2
Reclassification adjustments | (3.0) | (3.3)
Actuarial gains (losses) arising during the period | (1.3) | (0.7)
Effect of settlements | 0.0 | 0.0
Prior service credit recognized: |  |
Reclassification adjustments | (0.1) | (0.1)
Translation adjustment | 0.0 | 0.0
Amounts recognized in OCIL during the period | (4.4) | (4.1)
Unrecognized amounts in AOCL at end of period | 30.7 | 35.1
Other Postretirement | Foreign |  |
Actuarial gains (losses) recognized: |  |
Unrecognized amounts in AOCL at beginning of period | 5.9 | 4.2
Reclassification adjustments | (0.3) | (0.2)
Actuarial gains (losses) arising during the period | (1.1) | 1.8
Effect of settlements | 0.0 | 0.0
Prior service credit recognized: |  |
Reclassification adjustments | 0.0 | 0.0
Translation adjustment | (0.4) | 0.1
Amounts recognized in OCIL during the period | (1.8) | 1.7
Unrecognized amounts in AOCL at end of period | $ 4.1 | $ 5.9

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