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