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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) $ (1.6) $ 1.0 $ 10.3
Amortization of actuarial (loss) gain (2.2) (3.7) (3.6)
Amortization of prior service cost 1.5
Foreign exchange rate changes
Total recognized in other comprehensive (loss) income (0.6) (4.7) (15.4)
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income (2.5) (7.0) (16.7)
Pension | International      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) (17.2) 23.9 30.5
Amortization of actuarial (loss) gain (5.2) (5.1) (7.1)
Amortization of prior service cost 0.3 0.3 0.3
Foreign exchange rate changes 7.5 (21.5) (4.1)
Total recognized in other comprehensive (loss) income 19.2 (50.8) (42.0)
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income 23.9 (51.6) (46.1)
Post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial loss (gain) (0.1) 0.6 0.5
Amortization of actuarial (loss) gain 0.5 0.5 0.5
Amortization of prior service cost
Foreign exchange rate changes (0.1) 0.2
Total recognized in other comprehensive (loss) income 0.5 0.1
Total recognized in net periodic benefit (income) cost and other comprehensive (loss) income $ 0.2 $ (0.3) $ (0.4)