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BENEFIT PLANS: | 9 Months Ended
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Sep. 30, 2025
BENEFIT PLANS: |
BENEFIT PLANS: | ​ NOTE 9 — BENEFIT PLANS: ​ Post retirement defined benefit plans: ​ 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. On July 24, 2025, the Board of Directors of the Company authorized the termination of the non-contributory defined benefit pension plan covering former salaried employees in the United States and certain former expatriate employees in Peru. This termination will be effective December 1, 2025. ​ The components of net periodic benefit costs for the nine-month periods ended September 30, 2025 and 2024 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine months ended
​ | ​ | September 30,
(in millions) |  | 2025 |  | 2024
Service cost | ​ | $ | 1.9 | ​ | $ | 1.9
Interest cost | ​ |  | 2.8 | ​ |  | 2.8
Expected return on plan assets | ​ |  | (5.5) | ​ |  | (4.7)
Amortization of prior service cost / (credit) | ​ |  | 0.1 | ​ |  | 0.2
Amortization of net loss/(gain) | ​ |  | 0.1 | ​ |  | 0.3
Net periodic (benefit) cost | ​ | $ | (0.6) | ​ | $ | 0.5
​ Post-retirement health care plans: ​ In Mexico, health services are provided by the Mexican Institute of Social Security. ​ The components of net periodic benefit cost for the nine-month periods ended September 30, 2025 and 2024 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine months ended September 30,
(in millions) |  | 2025 |  | 2024
Interest cost | ​ | $ | 1.6 | ​ | $ | 1.5
Amortization of net loss (gain) | ​ |  | — | ​ |  | —
Amortization of prior service cost/ (credit) | ​ |  | (*) | ​ |  | (*)
Net periodic benefit cost | ​ | $ | 1.6 | ​ | $ | 1.5
(*) Less than $0.1 million. ​

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