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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Activity in treasury stock
Balance at the beginning of the period	$ 3,074.0
Balance at the end of the period	$ 3,107.6	$ 3,074.0
Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	111,497,617	111,509,217
Parent Company (Grupo Mexico)
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	74,367,673
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Balance at the beginning of the period	$ 2,767.2	$ 2,767.5
Used for corporate purposes	(0.3)	(0.3)	$ (0.4)
Balance at the end of the period	2,766.9	2,767.2	2,767.5
TREASURY STOCK: | Parent Company (Grupo Mexico)
Activity in treasury stock
Balance at the beginning of the period	306.8	296.0
Other activity, including dividend, interest and foreign currency transaction effect	33.9	10.8	15.0
Balance at the end of the period	$ 340.7	$ 306.8	$ 296.0

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