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PENSION, POST-RETIREMENT AND POST-EMPLOYMENT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net periodic benefit expense: |  |  |
Net periodic (benefit) cost | $ 1.8 | $ 1.5 | $ 2.8
Pension and SERP Benefits | Domestic |  |  |
Net periodic benefit expense: |  |  |
Service cost | 0.0 | 0.0 | 0.0
Interest cost on the projected benefit obligation | 8.4 | 8.7 | 6.3
Expected return on plan assets | (11.3) | (10.7) | (10.1)
Amortization of actuarial net gain | 0.0 | 0.0 | 0.0
Plan curtailment | 0.0 | 0.0 | 0.0
Net periodic (benefit) cost | (2.9) | (2.0) | (3.8)
Pension and SERP Benefits | Foreign |  |  |
Net periodic benefit expense: |  |  |
Service cost | 0.6 | 0.6 | 0.8
Interest cost on the projected benefit obligation | 0.6 | 0.7 | 0.3
Expected return on plan assets | (0.2) | (0.2) | (0.2)
Amortization of actuarial net gain | 0.0 | (0.1) | (0.1)
Plan curtailment | 0.0 | (0.4) | 0.0
Net periodic (benefit) cost | 1.0 | 0.6 | 0.8
Post-retirement Medical Benefits | Domestic |  |  |
Net periodic benefit expense: |  |  |
Service cost | 0.0 | 0.0 |
Interest cost on the projected benefit obligation | 0.3 | 0.3 | 0.2
Amortization of actuarial net gain | (0.2) | (0.4) | 0.0
Net periodic (benefit) cost | $ 0.1 | $ (0.1) | $ 0.2

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