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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.0 $ 0.0
Interest cost 1.9 1.9
Expected return on plan assets (3.2) (3.2)
Amortization of net loss (gain) 0.6 0.6
Net periodic benefit (income) cost [1] (0.7) (0.7)
Pension | International    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.2 0.2
Interest cost 4.5 4.6
Expected return on plan assets (4.4) (4.8)
Amortization of net loss (gain) 1.1 1.3
Net periodic benefit (income) cost [1] 1.4 1.3
Post-retirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.0 0.0
Interest cost 0.0 0.0
Expected return on plan assets 0.0 0.0
Amortization of net loss (gain) (0.1) (0.1)
Net periodic benefit (income) cost [1] $ (0.1) $ (0.1)
[1] The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense" in the Consolidated Statements of Loss.