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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Activity in treasury stock      
Balance at the beginning of the period $ 3,074.0    
Balance at the end of the period $ 3,087.7 $ 3,061.2  
Parent Company (Grupo Mexico) common shares      
Activity in treasury stock      
Treasury stock balance at the end of the period (in shares) 111,506,017   111,509,217
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 (0.1)    
Balance at the end of the period 2,767.1 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 13.8 (2.3)  
Other activity, including dividend, interest and foreign currency transaction effect 13.8 (2.3)  
Balance at the end of the period $ 320.6 $ 293.7  
Treasury stock balance at the end of the period (in shares) 79,728,356   79,800,655