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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Activity in treasury stock        
Balance at beginning of period $ 10,053.4 $ 8,560.2 $ 9,238.1 $ 7,481.2
Balance at end of period 10,516.9 8,989.4 10,516.9 8,989.4
Treasury Stock        
Activity in treasury stock        
Balance at end of period (2,191.5) (2,831.0) (2,191.5) (2,831.0)
Treasury Stock | Parent Company (Grupo Mexico) common shares        
Activity in treasury stock        
Balance at beginning of period (1,998.4) (2,566.9) (2,337.3) (2,766.7)
Dividends paid in common stock (201.5) (108.6) (540.3) (308.1)
Used for corporate purposes (0.1) (0.1) (0.2) (0.3)
Balance at end of period (1,796.8) (2,458.3) (1,796.8) (2,458.3)
Treasury Stock | Parent Company (Grupo Mexico)        
Activity in treasury stock        
Balance at beginning of period (373.5) (379.3) (363.4) (382.3)
Other activity, including dividend, interest and foreign currency translation effect 21.2 (6.5) 31.4 (9.6)
Balance at end of period $ (394.7) $ (372.7) $ (394.7) $ (372.7)