v3.26.1
SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
May 15, 2026
Mar. 31, 2026
Feb. 10, 2026
Feb. 09, 2026
Nov. 12, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jul. 03, 2023
Disclosure of non-adjusting events after reporting period [line items]                  
Proposed annual dividend (in dollars per american depository share) $ 1.80                
Dividends paid, per share (in dollars per share)         $ 0.09 $ 0.27 $ 0.31 $ 0.29  
Dividends paid, USD per ADS (in dollars per american depository share)         $ 0.90 $ 2.70 $ 3.10 $ 2.90  
Dividends paid, ordinary shares         $ 177,000 $ 530,031 [1] $ 608,554 [2] $ 569,292 [3]  
Usiminas                  
Disclosure of non-adjusting events after reporting period [line items]                  
Cash transferred                 $ 118,686
Subsequent acquisition of participation in Usiminas | Usiminas Control Group | Ternium Investments S.à r.l.                  
Disclosure of non-adjusting events after reporting period [line items]                  
Business combination, price per ordinary share (in dollars per share)     $ 2.06            
Cash transferred     $ 315,200            
Number of shares acquired through business combination (in shares)     153.1            
Proportion of ownership interest in subsidiary     83.10% 51.50%          
Subsequent acquisition of participation in Usiminas | Usiminas Control Group | Previdência Usiminas                  
Disclosure of non-adjusting events after reporting period [line items]                  
Proportion of ownership interest in subsidiary     7.10%            
Subsequent acquisition of participation in Usiminas | Usiminas Control Group | T/T Group                  
Disclosure of non-adjusting events after reporting period [line items]                  
Proportion of ownership interest in subsidiary     92.90%            
Potential ordinary share transactions                  
Disclosure of non-adjusting events after reporting period [line items]                  
Proposed annual dividend (in dollars per share) $ 0.18 $ 0.27              
Proposed annual dividend (in dollars per american depository share)   $ 2.70              
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners $ 353,000 $ 530,000              
[1] Represents $0.27 per share ($2.70 per ADS). Related to the dividends distributed on May 14 and on November 12, 2025, and as 41,666,666 shares are held as treasury shares by Ternium, the dividends attributable to these treasury shares amounting to $11.2 million were included in equity as deduction of dividend paid.
[2] Represents $0.31 per share ($3.10 per ADS). Related to the dividends distributed on May 8 and on November 21, 2024, and as 41,666,666 shares are held as treasury shares by Ternium, the dividends attributable to these treasury shares amounting to $12.9 million were included in equity as deduction of dividend paid.
[3] Represents $0.29 per share ($2.90 per ADS). Related to the dividends distributed on May 2 and on October 31, 2023, and as 41,666,666 shares are held as treasury shares by Ternium, the dividends attributable to these treasury shares amounting to $12.1 million were included in equity as deduction of dividend paid.