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STOCKHOLDERS'EQUITY: - Directors Stock Award Plan (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 23, 2025 | May 27, 2022 | Jun. 30, 2021 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Parent Company (Grupo Mexico) |  |  |  |  |  |
Activity in directors' stock award plan |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  |  | 50,208,315 |  | 52,355,259
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |
Activity in directors' stock award plan |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  |  | 50,267,580 |  | 65,497,804
Directors' Stock Award Plan |  |  |  |  |  |
STOCKHOLDERS'EQUITY: |  |  |  |  |  |
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 | 200 |  |  | 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 | 3 years | 5 years |  |  |  |
Stock based compensation expense |  |  |  | $ 1.5 | $ 0.6 |
Activity in directors' stock award plan |  |  |  |  |  |
Total shares granted at the beginning of the period (in shares) |  |  |  | (457,200) | (444,400) |
Granted in the period (in shares) |  |  |  | (8,000) | (6,400) |
Total shares granted at the end of the period (in shares) |  |  |  | (465,200) | (450,800) |
Remaining shares reserved |  |  |  | 134,800 | 149,200 |

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