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Pension and Postretirement Benefits | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Pension and Postretirement Benefits | Pension and Postretirement Benefits Components of the net periodic cost for pension and postretirement benefits for the three months ended June 30, 2024 and 2023 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 6.3 |  |  | $ | 5.7 |  |  | $ | 1.3 |  |  | $ | 1.2 |  |  | $ | — |  |  | $ | — |
Interest cost | 5.0 |  |  | 5.0 |  |  | 3.0 |  |  | 3.1 |  |  | 0.1 |  |  | 0.2 |
Expected return on plan assets | (5.6) |  |  | (5.7) |  |  | (2.0) |  |  | (1.8) |  |  | — |  |  | — |
Amortization of unrecognized prior service cost and other costs | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Amortization of unrecognized net loss | — |  |  | — |  |  | 0.7 |  |  | 0.3 |  |  | — |  |  | — |
Net periodic cost recognized | $ | 5.7 |  |  | $ | 5.1 |  |  | $ | 3.1 |  |  | $ | 2.9 |  |  | $ | 0.2 |  |  | $ | 0.3 |
Components of the net periodic cost for pension and postretirement benefits for the six months ended June 30, 2024 and 2023 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 12.0 |  |  | $ | 10.7 |  |  | $ | 2.6 |  |  | $ | 2.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 10.4 |  |  | 10.2 |  |  | 6.0 |  |  | 6.0 |  |  | 0.3 |  |  | 0.4 |
Expected return on plan assets | (11.6) |  |  | (12.0) |  |  | (3.9) |  |  | (3.4) |  |  | — |  |  | — |
Amortization of unrecognized prior service cost and other costs | — |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |
Amortization of unrecognized net loss | — |  |  | — |  |  | 1.3 |  |  | 0.6 |  |  | — |  |  | — |
Net periodic cost recognized | $ | 10.8 |  |  | $ | 9.0 |  |  | $ | 6.2 |  |  | $ | 5.7 |  |  | $ | 0.4 |  |  | $ | 0.5 |
The components of net periodic cost for pension and postretirement benefits other than service costs are included in other income (expense), net in our condensed consolidated statements of income. In August 2023, we amended the Company-sponsored qualified defined benefit pension plan in the United States (the "Qualified Plan") for non-union employees to discontinue future benefit accruals under the Qualified Plan and freeze existing accrued benefits effective January 1, 2025. Benefits earned by participants under the Qualified Plan prior to January 1, 2025, are not affected. We also amended the Company-sponsored non-qualified defined benefit pension plan in the United States (the "Non-Qualified Plan") that provides enhanced retirement benefits to select members of management. The Qualified Plan and the Non-Qualified Plan were closed to new entrants effective January 1, 2024, and September 1, 2023, respectively. The amendments resulted in a curtailment of both plans during the year ended December 31, 2023. The curtailment loss incurred and the change in projected benefit obligation was immaterial.

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