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Pension and Other Retiree Benefits - Pension Benefit Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets |  |  |  |
Employer contributions |  | $ 17.8 |  |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |  |
Pension and post-retirement benefit obligations |  | 117.2 | $ 157.6 |
Pension | U.S. |  |  |  |
Change in projected benefit obligation (PBO) |  |  |  |
Projected benefit obligation at beginning of year |  | 162.6 | 162.3 |
Service cost |  | 0.0 | 0.0 | $ 0.0
Interest cost |  | 7.7 | 7.9 | 4.9
Actuarial (gain) loss |  | (9.1) | 3.2 |
Participants’ contributions |  | 0.0 | 0.0 |
Benefits paid |  | (10.7) | (10.8) |
Settlement |  | 0.0 | 0.0 |
Termination benefits | [1] | 0.0 | 0.0 | 0.0
Foreign exchange rate changes |  | 0.0 | 0.0 |
Projected benefit obligation at end of year |  | 150.5 | 162.6 | 162.3
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 145.5 | 140.2 |
Actual return on plan assets |  | 7.6 | 13.6 |
Employer contributions |  | 3.0 | 2.5 |
Participants’ contributions |  | 0.0 | 0.0 |
Benefits paid |  | (10.7) | (10.8) |
Settlement |  | 0.0 | 0.0 |
Foreign exchange rate changes |  | 0.0 | 0.0 |
Fair value of plan assets at end of year |  | 145.4 | 145.5 | 140.2
Funded status (Fair value of plan assets less PBO) |  | (5.1) | (17.1) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |  |
Other non-current assets |  | 0.0 | 0.0 |
Other current liabilities |  | 0.0 | 0.0 |
Pension and post-retirement benefit obligations |  | 5.1 | 17.1 |
Components of accumulated other comprehensive income (loss), net of tax: |  |  |  |
Unrecognized actuarial loss (gain) |  | 84.4 | 90.7 |
Unrecognized prior service cost |  | 0.0 | 0.0 |
Pension | International |  |  |  |
Change in projected benefit obligation (PBO) |  |  |  |
Projected benefit obligation at beginning of year |  | 467.4 | 441.1 |
Service cost |  | 0.6 | 0.5 | 1.0
Interest cost |  | 18.5 | 20.0 | 9.6
Actuarial (gain) loss |  | (34.4) | 14.6 |
Participants’ contributions |  | 0.1 | 0.1 |
Benefits paid |  | (27.7) | (27.0) |
Settlement |  | (15.1) | (3.9) |
Termination benefits | [1] | 0.0 | 0.0 | 0.8
Foreign exchange rate changes |  | (12.9) | 22.0 |
Projected benefit obligation at end of year |  | 396.5 | 467.4 | 441.1
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 324.9 | 306.4 |
Actual return on plan assets |  | (8.4) | 18.9 |
Employer contributions |  | 14.5 | 14.1 |
Participants’ contributions |  | 0.1 | 0.1 |
Benefits paid |  | (27.7) | (27.0) |
Settlement |  | (15.1) | (4.0) |
Foreign exchange rate changes |  | (5.4) | 16.4 |
Fair value of plan assets at end of year |  | 282.9 | 324.9 | 306.4
Funded status (Fair value of plan assets less PBO) |  | (113.6) | (142.5) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |  |
Other non-current assets |  | 2.5 | 2.5 |
Other current liabilities |  | 7.2 | 7.5 |
Pension and post-retirement benefit obligations |  | 108.9 | 137.5 |
Components of accumulated other comprehensive income (loss), net of tax: |  |  |  |
Unrecognized actuarial loss (gain) |  | 121.9 | 139.9 |
Unrecognized prior service cost |  | 4.9 | 5.2 |
Post-retirement |  |  |  |
Change in projected benefit obligation (PBO) |  |  |  |
Projected benefit obligation at beginning of year |  | 3.3 | 3.2 |
Service cost |  | 0.0 | 0.0 | 0.0
Interest cost |  | 0.2 | 0.2 | 0.1
Actuarial (gain) loss |  | 0.5 | 0.1 |
Participants’ contributions |  | 0.0 | 0.0 |
Benefits paid |  | (0.3) | (0.3) |
Settlement |  | 0.0 | 0.0 |
Termination benefits | [1] | 0.0 | 0.0 | 0.0
Foreign exchange rate changes |  | (0.1) | 0.1 |
Projected benefit obligation at end of year |  | 3.6 | 3.3 | 3.2
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 0.0 | 0.0 |
Actual return on plan assets |  | 0.0 | 0.0 |
Employer contributions |  | 0.3 | 0.3 |
Participants’ contributions |  | 0.0 | 0.0 |
Benefits paid |  | (0.3) | (0.3) |
Settlement |  | 0.0 | 0.0 |
Foreign exchange rate changes |  | 0.0 | 0.0 |
Fair value of plan assets at end of year |  | 0.0 | 0.0 | $ 0.0
Funded status (Fair value of plan assets less PBO) |  | (3.6) | (3.3) |
Amounts recognized in the Consolidated Balance Sheets consist of: |  |  |  |
Other non-current assets |  | 0.0 | 0.0 |
Other current liabilities |  | 0.4 | 0.3 |
Pension and post-retirement benefit obligations |  | 3.2 | 3.0 |
Components of accumulated other comprehensive income (loss), net of tax: |  |  |  |
Unrecognized actuarial loss (gain) |  | (2.6) | (3.6) |
Unrecognized prior service cost |  | $ 0.0 | $ 0.0 |
[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.

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