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Postretirement Benefit Plans - Net Periodic Postretirement Cost Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 1.1 | $ 1.1 |  |
Interest cost | 5.6 | 6.1 |  |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.8 | 0.8 | $ 1.2 |
Interest cost | 2.7 | 3.0 | 1.3 |
Defined Benefit Plan, Amortization of Gain (Loss) | 0.3 | 0.0 | 1.3 |
Amortization of prior service cost | 0.0 | 0.0 | 0.0 |
Net periodic postretirement cost | 3.8 | 3.8 | 3.8 |
Settlement charge and other | (0.2) | 0.1 | 0.0 |
Cost for special termination benefit | 0.1 | 0.0 | 0.0 |
Total net periodic postretirement cost | 3.7 | 3.9 | 3.8 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net actuarial (gain) loss | (5.6) | 3.7 | (21.3) |
Prior service cost | 0.5 | 0.0 | 0.0 |
Amortization of net actuarial loss | (0.2) | 0.0 | (1.3) |
Foreign currency translation and other | (0.4) | 0.1 | (1.7) |
Total change recognized in other comprehensive income | (5.7) | 3.8 | (24.3) |
Total impact from net periodic postretirement cost and changes in other comprehensive income | (2.0) | 7.7 | (20.5) |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.3 | 0.3 | 0.6 |
Interest cost | 2.9 | 3.1 | 2.2 |
Defined Benefit Plan, Amortization of Gain (Loss) | 0.2 | 0.0 | 1.8 |
Amortization of prior service cost | (5.8) | (6.0) | (5.5) |
Net periodic postretirement cost | (2.4) | (2.6) | (0.9) |
Gain due to settlement/divestiture | (1.2) | 0.0 | 0.0 |
Total net periodic postretirement cost | (3.6) | (2.6) | (0.9) |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net actuarial (gain) loss | (7.0) | (2.9) | (23.3) |
Prior service cost | 0.0 | 0.0 | (8.1) | [1]
Amortization of net actuarial loss | (0.2) | 0.0 | (1.8) |
Amortization of prior service cost | 5.8 | 6.0 | 5.5 |
Recognized actuarial gain (loss) due to divestiture | 0.7 | 0.0 | 0.0 |
Total change recognized in other comprehensive income | (0.7) | 3.1 | (27.7) |
Total impact from net periodic postretirement cost and changes in other comprehensive income | (4.3) | 0.5 | (28.6) |
United States | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 |
Interest cost | 0.5 | 0.6 | 0.3 |
Defined Benefit Plan, Amortization of Gain (Loss) | 0.1 | 0.0 | 0.2 |
Amortization of prior service cost | 0.0 | 0.0 | 0.0 |
Net periodic postretirement cost | 0.6 | 0.6 | 0.5 |
Settlement charge and other | 0.0 | 0.0 | 0.0 |
Cost for special termination benefit | 0.0 | 0.0 | 0.0 |
Total net periodic postretirement cost | 0.6 | 0.6 | 0.5 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net actuarial (gain) loss | (0.4) | 0.3 | (3.0) |
Prior service cost | 0.0 | 0.0 | 0.0 |
Amortization of net actuarial loss | (0.1) | 0.0 | (0.2) |
Foreign currency translation and other | 0.0 | 0.0 | 0.0 |
Total change recognized in other comprehensive income | (0.5) | 0.3 | (3.2) |
Total impact from net periodic postretirement cost and changes in other comprehensive income | 0.1 | 0.9 | (2.7) |
International Plan [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.8 | 0.8 | 1.2 |
Interest cost | 2.2 | 2.4 | 1.0 |
Defined Benefit Plan, Amortization of Gain (Loss) | 0.2 | 0.0 | 1.1 |
Amortization of prior service cost | 0.0 | 0.0 | 0.0 |
Net periodic postretirement cost | 3.2 | 3.2 | 3.3 |
Settlement charge and other | (0.2) | 0.1 | 0.0 |
Cost for special termination benefit | 0.1 | 0.0 | 0.0 |
Total net periodic postretirement cost | 3.1 | 3.3 | 3.3 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net actuarial (gain) loss | (5.2) | 3.4 | (18.3) |
Prior service cost | 0.5 | 0.0 | 0.0 |
Amortization of net actuarial loss | (0.1) | 0.0 | (1.1) |
Foreign currency translation and other | (0.4) | 0.1 | (1.7) |
Total change recognized in other comprehensive income | (5.2) | 3.5 | (21.1) |
Total impact from net periodic postretirement cost and changes in other comprehensive income | $ (2.1) | $ 6.8 | $ (17.8) |
[1] | A prior service benefit was recognized in 2022 related to changes to a postretirement medical plan, covering certain unionized employees and retirees within our IP business. The changes closed the plan to new hires and, beginning in 2023, plan participants receive a fixed contribution into a Health Reimbursement account.

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