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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Parent Company (Grupo Mexico) common shares    
Activity in directors' stock award plan    
Treasury stock balance at the end of the period (in shares) 87,598,097 93,082,532
Directors' Stock Award Plan    
Share based Compensation Plan    
Common shares received on election as director 1,200  
Additional shares issued at each annual general meeting 1,200  
Total SCC shares reserved for the plan 600,000 600,000
Period of extension of plan 5 years  
Increased share awards issued to directors 1,600  
Activity in directors' stock award plan    
Total shares granted at the beginning of the period (in shares) (377,200) (362,800)
Granted in the period (14,400) (14,400)
Total shares granted at the end of the period (in shares) (391,600) (377,200)
Remaining shares reserved 208,400 222,800
Share based compensation    
Stock based compensation expense $ 0.4 $ 0.4