v3.26.1
STOCKHOLDERS'EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Activity in treasury stock            
Balance at beginning of year $ (11,859.3) $ (11,104.9) $ (9,636.7) $ (11,104.9) $ (9,238.1)  
Balance at end of year $ (12,708.6) (11,859.3) (10,053.4) $ (12,708.6) (10,053.4)  
Parent Company (Grupo Mexico) common shares            
Activity in treasury stock            
Treasury stock balance at the end of the period (in shares) 50,267,580     50,267,580   65,497,804
Treasury Stock            
Activity in treasury stock            
Dividends paid in common stock       $ (377.8)    
Balance at end of year $ 1,682.1   2,371.9 1,682.1 2,371.9  
Treasury Stock | Parent Company (Grupo Mexico) common shares            
Activity in treasury stock            
Balance at beginning of year 1,452.5 1,625.4 2,194.1 1,625.4 2,337.3  
Dividends paid in common stock (205.0)   (195.6) (377.8) (338.8)  
Used for corporate purposes (0.1)   (0.1) (0.2) (0.2)  
Balance at end of year 1,247.4 1,452.5 1,998.4 1,247.4 1,998.4  
Treasury Stock | Parent Company (Grupo Mexico)            
Activity in treasury stock            
Balance at beginning of year 418.0 408.8 360.1 408.8 363.4  
Other activity, including dividend, interest and foreign currency translation effect 16.7   13.5 25.9 10.2  
Balance at end of year $ 434.7 $ 418.0 $ 373.5 $ 434.7 $ 373.5