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Retirement Plans and Other Retiree Benefits | 3 Months Ended
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Mar. 31, 2020
Retirement Benefits [Abstract] |
Retirement Plans and Other Retiree Benefits | Retirement Plans and Other Retiree Benefits Components of Net periodic benefit cost for the three months ended March 31, 2020 and 2019 were as follows:
| Three Months Ended March 31,
| Pension Benefits |  | Other Retiree Benefits
| United States |  | International |  |  |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | — |  |  | $ | — |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 6 |  |  | $ | 4 |
Interest cost | 19 |  |  | 23 |  |  | 5 |  |  | 5 |  |  | 11 |  |  | 11 |
Expected return on plan assets | (27 | ) |  | (26 | ) |  | (4 | ) |  | (5 | ) |  | — |  |  | (1 | )
Amortization of actuarial loss (gain) | 11 |  |  | 13 |  |  | 1 |  |  | 2 |  |  | 5 |  |  | 2 |
Net periodic benefit cost | $ | 3 |  |  | $ | 10 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 22 |  |  | $ | 16 |
For the three months ended March 31, 2020 and 2019, the Company made voluntary contributions to its U.S. postretirement plans of $0 and $102, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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