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Pensions and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefit Plans | Pensions and Other Postretirement Benefit Plans The Company has defined benefit pension plans covering certain U.S. and non-U.S. employees. The Company also provides certain postretirement benefits to retired employees in the U.S. and Canada. The Company accrues the cost of providing these benefits during the active service period of the employees. The composition of the net periodic benefit cost for the three months ended March 31, 2021 and 2020, was as follows:
| Pension plans | Other postretirement benefits
(in thousands) | 2021 | 2020 | 2021 | 2020
Components of net periodic benefit cost: |  |  |  |
Service cost | $ | 545 |  | $ | 580 |  | $ | 33 |  | $ | 50 |
Interest cost | 1,338 |  | 1,550 |  | 276 |  | 428 |
Expected return on assets | (1,606) |  | (1,723) |  | — |  | — |
Amortization of prior service cost/(credit) | 3 |  | 8 |  | (1,122) |  | (1,122) |
Amortization of net actuarial loss | 544 |  | 596 |  | 565 |  | 648 |
Net periodic benefit cost | $ | 824 |  | $ | 1,011 |  | $ | (248) |  | $ | 4 |
The amount of net periodic benefit cost is determined at the beginning of each year and generally only varies from quarter to quarter when a significant event occurs, such as a curtailment or a settlement. There were no such events in the first three months of 2021 or 2020. Service cost for defined benefit pension and postretirement plans are reported in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. Other components of net periodic benefit cost are included in the line item Other (income)/expense, net in the Consolidated Statements of Income.

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