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Pension and Other Retiree Benefits | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Pension and Other Retiree Benefits | 5. Pension and Other Retiree Benefits 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. We expect to contribute approximately $15.8 million to our defined benefit plans in 2024. For the three months ended March 31, 2024, we have contributed $4.6 million to these plans.

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