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Retirement Plans and Other Retiree Benefits | 3 Months Ended
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Mar. 31, 2018
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, 2018 and 2017 were as follows:
| Pension Benefits |  | Other Retiree Benefits
| United States |  | International |  |  |  |
| Three Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost | 21 |  |  | 24 |  |  | 6 |  |  | 5 |  |  | 10 |  |  | 11 |
Expected return on plan assets | (29 | ) |  | (27 | ) |  | (6 | ) |  | (5 | ) |  | — |  |  | — |
Amortization of transition and prior service costs (credits) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial loss (gain) | 12 |  |  | 12 |  |  | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Net periodic benefit cost | $ | 4 |  |  | $ | 9 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 18 |  |  | $ | 19 |
For the three months ended March 31, 2018 and 2017, the Company made voluntary contributions to its U.S. postretirement plans of $0 and $57, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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