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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Activity in treasury stock      
Balance at the beginning of the period $ 3,063.5    
Balance at the end of the period $ 3,074.0 $ 3,063.5  
Parent Company (Grupo Mexico) common shares      
Activity in treasury stock      
Treasury stock balance at the end of the period (in shares) 111,509,217 111,522,817  
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares      
Activity in treasury stock      
Balance at the beginning of the period $ 2,767.5 $ 2,767.9  
Used for corporate purposes (0.3) (0.4) $ (0.4)
Balance at the end of the period 2,767.2 2,767.5 2,767.9
TREASURY STOCK: | Parent Company (Grupo Mexico)      
Activity in treasury stock      
Balance at the beginning of the period 296.0 281.0  
Other activity, including dividend, interest and foreign currency transaction effect 10.8 15.0 29.7
Balance at the end of the period $ 306.8 $ 296.0 $ 281.0