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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (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] |  |  |  |
Service cost |  | $ 0.0 | $ 0.0 | $ 0.0
Interest cost |  | 7.7 | 7.9 | 4.9
Expected return on plan assets |  | (12.9) | (12.0) | (10.9)
Amortization of net loss (gain) |  | 2.5 | 2.2 | 3.7
Amortization of prior service cost |  | 0.0 | 0.0 | 0.0
Special termination benefit | [1] | 0.0 | 0.0 | 0.0
Settlement | [2] | 0.0 | 0.0 | 0.0
Net periodic benefit cost (income) cost | [3] | (2.7) | (1.9) | (2.3)
Pension | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0.6 | 0.5 | 1.0
Interest cost |  | 18.5 | 20.0 | 9.6
Expected return on plan assets |  | (19.6) | (21.5) | (17.5)
Amortization of net loss (gain) |  | 5.4 | 4.2 | 5.0
Amortization of prior service cost |  | 0.3 | 0.3 | 0.3
Special termination benefit | [1] | 0.0 | 0.0 | 0.8
Settlement | [2] | 4.6 | 1.2 | 0.0
Net periodic benefit cost (income) cost | [3] | 9.8 | 4.7 | (0.8)
Post-retirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost |  | 0.0 | 0.0 | 0.0
Interest cost |  | 0.2 | 0.2 | 0.1
Expected return on plan assets |  | 0.0 | 0.0 | 0.0
Amortization of net loss (gain) |  | (0.6) | (0.5) | (0.5)
Amortization of prior service cost |  | 0.0 | 0.0 | 0.0
Special termination benefit | [1] | 0.0 | 0.0 | 0.0
Settlement | [2] | 0.0 | 0.0 | 0.0
Net periodic benefit cost (income) cost | [3] | $ (0.4) | $ (0.3) | $ (0.4)
[1] | Special termination benefit of $0.8 million due to the plan wind-up of our Canadian Salaried and Hourly pension plans effective July 1, 2022.
[2] | 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.
[3] | 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 Loss.

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