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STOCKHOLDERS' EQUITY: - Directors Stock Award Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
May 23, 2025
May 27, 2022
Jun. 30, 2021
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Parent Company (Grupo Mexico)            
Activity in directors' stock award plan            
Treasury stock balance at the end of the period (in shares)       54,573,017   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 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       $ 0.9 $ 1.3  
Activity in directors' stock award plan            
Total shares granted at the beginning of the period (in shares)       (444,400) (428,800)  
Granted (in shares)       (9,600) (12,400)  
Total shares granted at the end of the period (in shares)       (454,000) (441,200)  
Remaining shares reserved       146,000 158,800