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STOCKHOLDERS' EQUITY: - Directors Stock Award Plan (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
May 27, 2022 | Mar. 31, 2025 | Mar. 31, 2024 | Jun. 30, 2021 | Dec. 31, 2024
Parent Company (Grupo Mexico) |  |  |  |  |
Activity in directors' stock award plan |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  | 58,316,437 |  |  | 61,972,864
Directors' Stock Award Plan |  |  |  |  |
Share based Compensation Plan |  |  |  |  |
Total SCC shares reserved for the plan |  | 600,000 | 600,000 |  |
Common shares received on election as director |  | 1,600 |  |  |
Additional shares issued at each annual general meeting |  | 1,600 |  |  |
Numbers of shares shall be granted quarterly and conditioned upon the attendance of each director to each Board meeting |  |  |  | 400 |
Period of extension of plan | 5 years |  |  |  |
Stock based compensation expense |  | $ 0.3 | $ 0.2 |  |
Activity in directors' stock award plan |  |  |  |  |
Total shares granted at the beginning of the period (in shares) |  | (444,400) | (428,800) |  |
Granted (in shares) |  | (3,200) | (2,800) |  |
Total shares granted at the end of the period (in shares) |  | (447,600) | (431,600) |  |
Remaining shares reserved |  | 152,400 | 168,400 |  |

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