STOCKHOLDERS' EQUITY - Directors Stock Award Plan (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
	May 27, 2022	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022
Parent Company (Grupo Mexico)
Activity in directors' stock award plan
Treasury stock balance at the end of the period (in shares)		67,775,330			72,325,043
Directors' Stock Award Plan
Share based Compensation Plan
Common shares received on election as director		1,600
Additional shares issued at each annual general meeting		1,600
Total SCC shares reserved for the plan		600,000	600,000
Period of extension of plan	5 years
Numbers of shares shall be granted quarterly and conditioned upon the attendance of each director to each Board meeting				400
Stock based compensation expense					$ 0.3	$ 0.3
Activity in directors' stock award plan
Total shares granted at the beginning of the period (in shares)		(428,800)	(416,800)		(416,800)
Granted (in shares)		(2,800)	(3,200)
Total shares granted at the end of the period (in shares)		(431,600)	(420,000)		(428,800)	(416,800)
Remaining shares reserved		168,400	180,000