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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Activity in treasury stock
Balance at the beginning of the period			$ 3,107.6
Balance at the end of the period	$ 3,131.1	$ 3,096.3	$ 3,131.1	$ 3,096.3
Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	111,488,017		111,488,017		111,497,617
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Balance at the beginning of the period			$ 2,766.9	2,767.2
Used for corporate purposes	$ (0.1)	(0.1)	(0.2)	(0.2)
Balance at the end of the period	2,766.7	2,767.0	2,766.7	2,767.0
TREASURY STOCK: | Parent Company (Grupo Mexico)
Activity in treasury stock
Balance at the beginning of the period			340.7	306.8
Other activity, including dividend, interest and foreign currency transaction effect	(0.6)	4.9	23.7	22.5
Balance at the end of the period	$ 364.4	$ 329.3	$ 364.4	$ 329.3

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Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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