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Pension and Other Retiree Benefits - Other Changes Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial (gain) loss | $ (3.8) | $ 1.6 | $ (1.0)
Amortization of actuarial (loss) gain | (2.5) | (2.2) | (3.7)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign exchange rate changes | 0.0 | 0.0 | 0.0
Total recognized in other comprehensive (loss) income | (6.3) | (0.6) | (4.7)
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income | (9.0) | (2.5) | (7.0)
Pension | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial (gain) loss | (6.5) | 17.2 | (23.9)
Amortization of actuarial (loss) gain | (9.9) | (5.2) | (5.1)
Amortization of prior service cost | (0.3) | (0.3) | (0.3)
Foreign exchange rate changes | (1.7) | 7.5 | (21.5)
Total recognized in other comprehensive (loss) income | (18.4) | 19.2 | (50.8)
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income | (8.6) | 23.9 | (51.6)
Post-retirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year actuarial (gain) loss | 0.5 | 0.1 | (0.6)
Amortization of actuarial (loss) gain | 0.5 | 0.5 | 0.5
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign exchange rate changes | 0.1 | (0.1) | 0.2
Total recognized in other comprehensive (loss) income | 1.1 | 0.5 | 0.1
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income | $ 0.7 | $ 0.2 | $ (0.3)

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