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Pension and Other Retiree Benefits (Tables) | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost for Pension and Post-Retirement Plans | The components of net periodic benefit (income) cost for pension and post-retirement plans for the three months ended March 31, 2024 and 2023 were as follows:
|  | Three Months Ended March 31, |
|  | Pension |  |  | Post-retirement |
|  | U.S. |  |  | International |  |  |  |  |  |  |
(in millions) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 1.9 |  |  |  | 2.0 |  |  |  | 4.6 |  |  |  | 4.9 |  |  |  | — |  |  |  | — |
Expected return on plan assets |  |  | (3.2 | ) |  |  | (3.0 | ) |  |  | (4.8 | ) |  |  | (5.3 | ) |  |  | — |  |  |  | — |
Amortization of net loss (gain) |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 1.3 |  |  |  | 1.0 |  |  |  | (0.1 | ) |  |  | (0.1 | )
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | — |
Net periodic benefit (income) cost (1) |  | $ | (0.7 | ) |  | $ | (0.4 | ) |  | $ | 1.3 |  |  | $ | 0.8 |  |  | $ | (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 Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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