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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 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 $ 3,115.1 $ 3,087.7  
Parent Company (Grupo Mexico) common shares      
Activity in treasury stock      
Treasury stock balance at the end of the period (in shares) 111,494,417   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)  
Balance at the end of the period 2,766.8 2,767.1  
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 7.6 13.8  
Balance at the end of the period $ 348.3 $ 320.6