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Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
United States |  |  |
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |
Rate of compensation increase (as a percent) | 2.40% | 2.40% | 2.40%
Foreign Plans |  |  |
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |
Rate of compensation increase (as a percent) | 1.89% | 1.93% | 1.75%
Pension Benefits |  |  |
Components of net pension expense: |  |  |
Service cost | $ 3.7 | $ 3.8 | $ 6.0
Interest cost | $ 24.1 | $ 25.4 | $ 14.0
Interest cost, extensible enumeration | Other income (expense), net | Other income (expense), net | Other income (expense), net
Expected return on plan assets | $ (28.7) | $ (29.1) | $ (29.9)
Expected return on plan assets, extensible enumeration | Other income (expense), net | Other income (expense), net | Other income (expense), net
Amortization of prior service cost | $ 1.3 | $ 1.8 | $ 1.4
Amortization of prior service cost, extensible enumeration | Other income (expense), net | Other income (expense), net | Other income (expense), net
Amortization of net actuarial losses | $ 3.2 | $ 2.3 | $ 16.1
Amortization of actuarial losses, extensible enumeration | Other income (expense), net | Other income (expense), net | Other income (expense), net
Net pension expense (income) | $ 3.6 | $ 4.2 | $ 7.6
Pension Benefits | United States |  |  |
Components of net pension expense: |  |  |
Service cost | 2.2 | 2.5 | 3.5
Interest cost | 17.8 | 18.6 | 10.6
Expected return on plan assets | (24.1) | (24.6) | (26.5)
Amortization of prior service cost | 1.3 | 1.7 | 1.4
Amortization of net actuarial losses | 2.7 | 1.6 | 11.9
Net pension expense (income) | $ (0.1) | $ (0.2) | $ 0.9
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |
Discount rate (as a percent) | 4.97% | 5.18% | 2.69%
Expected long-term return on assets (as a percent) | 5.50% | 5.50% | 5.50%
Pension Benefits | Foreign Plans |  |  |
Components of net pension expense: |  |  |
Service cost | $ 1.5 | $ 1.3 | $ 2.5
Interest cost | 6.3 | 6.8 | 3.4
Expected return on plan assets | (4.6) | (4.5) | (3.4)
Amortization of prior service cost | 0.0 | 0.1 | 0.0
Amortization of net actuarial losses | 0.5 | 0.7 | 4.2
Net pension expense (income) | $ 3.7 | $ 4.4 | $ 6.7
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |
Discount rate (as a percent) | 3.72% | 4.20% | 1.58%
Expected long-term return on assets (as a percent) | 5.45% | 5.45% | 3.35%

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