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Pension and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Components of Net Periodic Cost for Pension and Postretirement Benefits | Components of the net periodic cost for pension and postretirement benefits for the three months ended September 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 | $ | 6.0 |  |  | $ | 5.4 |  |  | $ | 1.3 |  |  | $ | 1.2 |  |  | $ | — |  |  | $ | — |
Interest cost | 5.2 |  |  | 5.1 |  |  | 3.2 |  |  | 2.9 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (5.8) |  |  | (6.0) |  |  | (2.1) |  |  | (1.6) |  |  | — |  |  | — |
Amortization of unrecognized prior service cost and other costs | — |  |  | — |  |  | 0.1 |  |  | (0.1) |  |  | — |  |  | — |
Amortization of unrecognized net loss | — |  |  | — |  |  | 0.7 |  |  | 0.4 |  |  | 0.1 |  |  | — |
Net periodic cost recognized | $ | 5.4 |  |  | $ | 4.5 |  |  | $ | 3.2 |  |  | $ | 2.8 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Components of the net periodic cost for pension and postretirement benefits for the nine months ended September 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 | $ | 18.0 |  |  | $ | 16.1 |  |  | $ | 3.9 |  |  | $ | 3.5 |  |  | $ | — |  |  | $ | — |
Interest cost | 15.6 |  |  | 15.3 |  |  | 9.2 |  |  | 8.9 |  |  | 0.5 |  |  | 0.6 |
Expected return on plan assets | (17.4) |  |  | (18.0) |  |  | (6.0) |  |  | (5.0) |  |  | — |  |  | — |
Amortization of unrecognized prior service cost and other costs | — |  |  | 0.1 |  |  | 0.3 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Amortization of unrecognized net loss | — |  |  | — |  |  | 2.0 |  |  | 1.0 |  |  | 0.1 |  |  | — |
Net periodic cost recognized | $ | 16.2 |  |  | $ | 13.5 |  |  | $ | 9.4 |  |  | $ | 8.5 |  |  | $ | 0.7 |  |  | $ | 0.7 |

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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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