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BENEFIT PLANS: | 6 Months Ended
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Jun. 30, 2023
BENEFIT PLANS: |
BENEFIT PLANS: | NOTE 9 — BENEFIT PLANS: ​ Post retirement defined benefit plans: ​ The Company has two non-contributory defined benefit pension plans covering former salaried employees in the United States and certain former expatriate employees in Peru. Effective October 31, 2000, the Board of Directors amended the qualified pension plan to suspend the accrual of benefits. In addition, the Company’s Mexican subsidiaries have a defined contribution pension plan for salaried employees and a non-contributory defined benefit pension plan for union employees. ​ The components of net periodic benefit costs for the first six months of 2023 and 2022 are as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2023 |  | 2022
Service cost | ​ | $ | 1.0 | ​ | $ | 0.9
Interest cost | ​ |  | 1.7 | ​ |  | 1.1
Expected return on plan assets | ​ |  | (2.7) | ​ |  | (1.9)
Amortization of prior service cost / (credit) | ​ |  | — | ​ |  | 0.1
Amortization of net loss/(gain) | ​ |  | 0.2 | ​ |  | 0.3
Net periodic benefit cost | ​ | $ | 0.2 | ​ | $ | 0.5
​ Post-retirement health care plans: ​ In Mexico, health services are provided by the Mexican Social Security Institute. ​ The components of net periodic benefit cost for the first six months of 2023 and 2022 are as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2023 |  | 2022
Interest cost | ​ | $ | 1.0 | ​ | $ | 0.8
Amortization of net loss (gain) | ​ |  | — | ​ |  | 0.1
Amortization of prior service cost/ (credit) | ​ |  | — | ​ |  | (*)
Net periodic benefit cost | ​ | $ | 1.0 | ​ | $ | 0.9
​

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