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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 7.7 7.7 7.9
Expected return on plan assets (12.7) (12.9) (12.0)
Amortization of net loss (gain) 2.4 2.5 2.2
Amortization of prior service cost 0.0 0.0 0.0
Settlement [1] 0.0 0.0 0.0
Net periodic benefit cost (income) cost [2] (2.6) (2.7) (1.9)
Pension | International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.7 0.6 0.5
Interest cost 18.7 18.5 20.0
Expected return on plan assets (18.2) (19.6) (21.5)
Amortization of net loss (gain) 4.5 5.4 4.2
Amortization of prior service cost 0.3 0.3 0.3
Settlement [1] 0.1 4.6 1.2
Net periodic benefit cost (income) cost [2] 6.1 9.8 4.7
Post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 0.2 0.2 0.2
Expected return on plan assets 0.0 0.0 0.0
Amortization of net loss (gain) (0.4) (0.6) (0.5)
Amortization of prior service cost 0.0 0.0 0.0
Settlement [1] 0.0 0.0 0.0
Net periodic benefit cost (income) cost [2] $ (0.2) $ (0.4) $ (0.3)
[1] Settlement amounts of $4.6 million in 2024 and $1.2 million in 2023 are primarily related to the wind-up of our Canadian Salaried and Hourly pension plans.
[2] The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense (income)" in the Consolidated Statements of Income (Loss).