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Retirement and Postretirement Benefits | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Retirement and Postretirement Benefits | Retirement and Postretirement Benefits Components of the net periodic cost for retirement and postretirement benefits for the three months ended September 30, 2021 and 2020 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 6.3 |  |  | $ | 6.4 |  |  | $ | 1.8 |  |  | $ | 2.0 |  |  | $ | — |  |  | $ | — |
Interest cost | 2.9 |  |  | 3.8 |  |  | 1.3 |  |  | 1.8 |  |  | 0.1 |  |  | 0.1 |
Expected return on plan assets | (6.3) |  |  | (6.4) |  |  | (1.5) |  |  | (1.4) |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | — |
Amortization of unrecognized net loss (gain) | 1.9 |  |  | 1.7 |  |  | 1.1 |  |  | 1.2 |  |  | — |  |  | — |
Net periodic cost recognized | $ | 4.8 |  |  | $ | 5.5 |  |  | $ | 2.7 |  |  | $ | 3.7 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Components of the net periodic cost for retirement and postretirement benefits for the nine months ended September 30, 2021 and 2020 were as follows:
| U.S. Defined Benefit Plans |  | Non-U.S. Defined Benefit Plans |  | Postretirement Medical Benefits
(Amounts in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 18.9 |  |  | $ | 19.4 |  |  | $ | 5.5 |  |  | $ | 5.4 |  |  | $ | — |  |  | $ | — |
Interest cost | 8.9 |  |  | 11.3 |  |  | 4.1 |  |  | 5.0 |  |  | 0.3 |  |  | 0.4 |
Expected return on plan assets | (19.0) |  |  | (19.3) |  |  | (4.6) |  |  | (3.8) |  |  | — |  |  | — |
Amortization of prior service cost | 0.1 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |
Amortization of unrecognized net loss (gain) | 5.8 |  |  | 5.2 |  |  | 3.3 |  |  | 3.3 |  |  | — |  |  | (0.1) |
Net periodic cost recognized | $ | 14.7 |  |  | $ | 16.7 |  |  | $ | 8.5 |  |  | $ | 10.1 |  |  | $ | 0.4 |  |  | $ | 0.4 |
The components of net periodic cost for retirement and postretirement benefits other than service costs are included in other income (expense), net in our condensed consolidated statements of income.

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