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Pension and Other Retiree Benefits - Net Periodic Benefit Expense (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pension | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | $ 0.0 | $ 0.0
Interest cost |  | 1.9 | 1.9
Expected return on plan assets |  | (3.2) | (3.2)
Amortization of net loss (gain) |  | 0.6 | 0.6
Net periodic benefit (income) cost | [1] | (0.7) | (0.7)
Pension | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | 0.2 | 0.2
Interest cost |  | 4.5 | 4.6
Expected return on plan assets |  | (4.4) | (4.8)
Amortization of net loss (gain) |  | 1.1 | 1.3
Net periodic benefit (income) cost | [1] | 1.4 | 1.3
Post-retirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | 0.0 | 0.0
Interest cost |  | 0.0 | 0.0
Expected return on plan assets |  | 0.0 | 0.0
Amortization of net loss (gain) |  | (0.1) | (0.1)
Net periodic benefit (income) cost | [1] | $ (0.1) | $ (0.1)
[1] | The components of net periodic benefit (income) cost, other than service cost, are included in the line "Non-operating pension expense" in the Consolidated Statements of Loss.

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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