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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
May 23, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Activity in treasury stock            
Balance at the beginning of the period       $ 3,149.0    
Balance at the end of the period   $ 2,946.2 $ 3,131.8 $ 2,946.2 $ 3,131.8  
Dividends paid as cash dividend (in dollars per share)       $ 2.00 $ 2.25  
Parent Company (Grupo Mexico) common shares            
Activity in treasury stock            
Treasury stock balance at the end of the period (in shares)   103,436,825   103,436,825   111,485,617
Dividends paid as cash dividend (in dollars per share) $ 0.0104          
Reduction of shares in treasury stock 8,039,992          
Treasury stock retired amount $ 199.5          
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares            
Activity in treasury stock            
Balance at the beginning of the period       $ 2,766.7 $ 2,766.9  
Used for corporate purposes       (199.7) (0.1)  
Balance at the end of the period   $ 2,566.9 2,766.8 2,566.9 2,766.8  
TREASURY STOCK: | Parent Company (Grupo Mexico)            
Activity in treasury stock            
Balance at the beginning of the period       382.3 340.7  
Other activity, including dividend, interest and foreign currency transaction effect   (11.3) 16.7 (3.1) 24.3  
Balance at the end of the period   $ 379.3 $ 365.0 379.3 $ 365.0  
TREASURY STOCK: | Maximum | Parent Company (Grupo Mexico) common shares            
Activity in treasury stock            
Used for corporate purposes       $ 0.1