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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Activity in treasury stock      
Balance at the beginning of the period $ 3,107.6    
Purchase of shares 2,900.0    
Balance at the end of the period $ 3,149.0 $ 3,107.6  
Parent Company (Grupo Mexico) common shares      
Activity in treasury stock      
Treasury stock balance at the end of the period (in shares) 111,485,617 111,497,617  
Parent Company (Grupo Mexico)      
Activity in treasury stock      
Treasury stock balance at the end of the period (in shares) 67,793,020 74,367,673  
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 (0.3) (0.3) $ (0.3)
Balance at the end of the period 2,766.6 2,766.9 2,767.2
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 41.7 33.9 10.8
Balance at the end of the period $ 382.4 $ 340.7 $ 306.8