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Retirement and Postretirement Benefits | 3 Months Ended
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Mar. 31, 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 March 31, 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 | $ | 6.8 |  |  | $ | 6.3 |  |  | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | — |
Interest cost | 3.1 |  |  | 3.8 |  |  | 1.4 |  |  | 1.6 |  |  | 0.1 |  |  | 0.1 |
Expected return on plan assets | (6.5) |  |  | (6.7) |  |  | (1.5) |  |  | (1.2) |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | — |
Amortization of unrecognized net loss (gain) | 1.9 |  |  | 1.7 |  |  | 1.1 |  |  | 1.0 |  |  | — |  |  | — |
Net periodic cost recognized | $ | 5.3 |  |  | $ | 5.1 |  |  | $ | 2.9 |  |  | $ | 3.2 |  |  | $ | 0.1 |  |  | $ | 0.1 |
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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