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Pension and Postretirement Benefits | 9 Months Ended
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Sep. 30, 2023
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 September 30, 2023 and 2022 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | 5.4 |  |  | $ | 6.1 |  |  | $ | 1.2 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 5.1 |  |  | 3.3 |  |  | 2.9 |  |  | 1.3 |  |  | 0.2 |  |  | 0.1 |
Expected return on plan assets | (6.0) |  |  | (6.3) |  |  | (1.6) |  |  | (1.2) |  |  | — |  |  | — |
Amortization of unrecognized prior service cost and other costs | — |  |  | — |  |  | (0.1) |  |  | (0.1) |  |  | — |  |  | — |
Amortization of unrecognized net loss | — |  |  | 0.9 |  |  | 0.4 |  |  | 0.5 |  |  | — |  |  | 0.1 |
Net periodic cost recognized | $ | 4.5 |  |  | $ | 4.0 |  |  | $ | 2.8 |  |  | $ | 1.8 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Components of the net periodic cost for pension and postretirement benefits for the nine months ended September 30, 2023 and 2022 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | 16.1 |  |  | $ | 18.5 |  |  | $ | 3.5 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 15.3 |  |  | 9.9 |  |  | 8.9 |  |  | 4.6 |  |  | 0.6 |  |  | 0.3 |
Expected return on plan assets | (18.0) |  |  | (19.0) |  |  | (5.0) |  |  | (4.1) |  |  | — |  |  | — |
Amortization of unrecognized prior service cost and other costs | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |
Amortization of unrecognized net loss | — |  |  | 2.6 |  |  | 1.0 |  |  | 1.9 |  |  | — |  |  | 0.2 |
Net periodic cost recognized | $ | 13.5 |  |  | $ | 12.1 |  |  | $ | 8.5 |  |  | $ | 6.9 |  |  | $ | 0.7 |  |  | $ | 0.6 |
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 a Company-sponsored qualified defined benefit pension plan in the U.S (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 a Company-sponsored non-qualified defined benefit pension plan in the U.S. (the “Non-qualified Plan”) that provides enhanced retirement benefits to select members of management. The Qualified Plan and the Non-qualified Plan are closed to new entrants effective January 1, 2024, and September 1, 2023, respectively. The amendments resulted in a curtailment of both plans during the current period. The curtailment loss incurred and the change in projected benefit obligation is immaterial. Enhanced benefits will be provided to employees under a defined contribution plan beginning on January 1, 2024, and January 1, 2025 for new employees and existing employees, respectively.

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