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DEFERRED INCOME TAX (Changes in Deferred Tax Assets and Liabilities) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance $ 1,542,565 $ 37,495  
Translation differences (263,349) (4,373)  
Acquisition of business (note 3) 0 1,327,232  
Credits (Charges) directly to OCI 57,867 (48,854)  
Recognition of previously unrecognized tax losses 25,438 128,634  
Income statement credit (charge) (256,830) 102,431  
Deferred tax assets, ending balance 1,105,691 1,542,565  
Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax credits for which no deferred tax asset recognised 8,000 14,200  
Unused tax losses for which no deferred tax asset recognised 287,600 357,400  
Unused tax credits for which no deferred tax asset recognised 8,000 14,200  
Unused tax losses for which no deferred tax asset recognised 287,600 357,400  
Ternium Brasil Ltda.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which no deferred tax asset recognised 688,400 889,400  
Unused tax losses for which no deferred tax asset recognised 688,400 889,400  
Ternium Brasil Ltda. And Usinas Siderúrgicas de Minas Gerais S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets recognized on unused tax losses 314,100 383,000  
Deferred tax assets recognized on unused tax losses 314,100 383,000  
Ternium S.A.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which no deferred tax asset recognised   2,200,000 $ 2,100,000
Estimated tax loss $ 26,700 $ 30,100  
Unused tax losses generated from prior period 0.92 0.92  
Unused tax losses for which no deferred tax asset recognised   $ 2,200,000 2,100,000
Ternium Investments S.à r.l.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Unused tax losses for which no deferred tax asset recognised   $ 2,600,000 2,600,000
Unused tax losses generated from prior period 0.98 0.98  
Estimated tax result $ 7,800 $ 900  
Unused tax losses for which no deferred tax asset recognised   2,600,000 $ 2,600,000
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 323,538    
Deferred tax liability, beginning balance   (200,556)  
Translation differences (81,642) (2,360)  
Acquisition of business (note 3)   412,320  
Income statement credit (charge) (111,558) 114,134  
Deferred tax assets, ending balance 130,338 323,538  
Inventories      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 17,831    
Deferred tax liability, beginning balance   (69,594)  
Translation differences (15,440) (903)  
Acquisition of business (note 3)   116,290  
Income statement credit (charge) (40,304) (27,962)  
Deferred tax liability, ending balance (37,913)    
Deferred tax assets, ending balance   17,831  
Intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 134,328    
Deferred tax liability, beginning balance   (22,923)  
Translation differences (34,905) (683)  
Acquisition of business (note 3)   143,033  
Income statement credit (charge) 52,978 14,901  
Deferred tax assets, ending balance 152,401 134,328  
Provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 354,097 98,999  
Translation differences (48,805) (698)  
Acquisition of business (note 3)   255,529  
Income statement credit (charge) (38,024) 267  
Deferred tax assets, ending balance 267,268 354,097  
Trade receivables      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 42,674 15,515  
Translation differences (5,608) 0  
Acquisition of business (note 3)   28,510  
Income statement credit (charge) 4,242 (1,351)  
Deferred tax assets, ending balance 41,308 42,674  
Tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 382,971 17,400  
Translation differences (65,362) 4,901  
Acquisition of business (note 3)   304,237  
Recognition of previously unrecognized tax losses 25,438    
Income statement credit (charge) (28,987) 56,433  
Deferred tax assets, ending balance 314,060 382,971  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets, beginning balance 287,126 198,654  
Translation differences (11,587) (4,630)  
Acquisition of business (note 3)   67,313  
Credits (Charges) directly to OCI 57,867 (48,854)  
Recognition of previously unrecognized tax losses 128,634    
Income statement credit (charge) (95,177) (53,991)  
Deferred tax assets, ending balance $ 238,229 $ 287,126