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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0.0 $ 0.0
Interest cost 1.9 2.0
Expected return on plan assets (3.2) (3.0)
Amortization of net loss (gain) 0.6 0.6
Amortization of prior service cost 0.0 0.0
Net periodic benefit (income) cost [1] (0.7) (0.4)
Pension | International    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.2 0.1
Interest cost 4.6 4.9
Expected return on plan assets (4.8) (5.3)
Amortization of net loss (gain) 1.3 1.0
Amortization of prior service cost 0.0 0.1
Net periodic benefit (income) cost [1] 1.3 0.8
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)
Amortization of prior service cost 0.0 0.0
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.