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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)