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Pension Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Pension Benefit Plans |
Pension Benefit Plans | 6. Pension Benefit Plans The components of the net periodic pension cost for the three months ended June 30, 2019 and 2018 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. | ​ | Non-U.S. |
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Service cost | ​ | $ | 3 | ​ | $ | 4 | ​ | $ | 3 | ​ | $ | 3 | ​
Interest cost | ​ |  | 15 | ​ |  | 15 | ​ |  | 7 | ​ |  | 8 | ​
Expected asset return | ​ | ​ | (22) | ​ | ​ | (25) | ​ | ​ | (11) | ​ | ​ | (14) | ​
Amortization of actuarial loss | ​ | ​ | 10 | ​ | ​ | 13 | ​ | ​ | 3 | ​ | ​ | 3 | ​
Net periodic pension cost | ​ | $ | 6 | ​ | $ | 7 | ​ | $ | 2 | ​ | $ | — | ​
​ ​ The components of the net periodic pension cost for the six months ended June 30, 2019 and 2018 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. | ​ | Non-U.S. |
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Service cost | ​ | $ | 6 | ​ | $ | 7 | ​ | $ | 6 | ​ | $ | 7 | ​
Interest cost | ​ |  | 30 | ​ |  | 30 | ​ |  | 15 | ​ |  | 16 | ​
Expected asset return | ​ | ​ | (44) | ​ | ​ | (49) | ​ | ​ | (22) | ​ | ​ | (27) | ​
Amortization of actuarial loss | ​ | ​ | 20 | ​ | ​ | 26 | ​ | ​ | 5 | ​ | ​ | 7 | ​
Net periodic pension cost | ​ | $ | 12 | ​ | $ | 14 | ​ | $ | 4 | ​ | $ | 3 | ​
​

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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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