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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments: m-ad) (Details)
m³ in Thousands, T in Thousands, $ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended 120 Months Ended
Dec. 31, 2024
USD ($)
credit
m³
Dec. 31, 2023
m³
Jun. 30, 2016
MW
Sep. 30, 2024
Dec. 31, 2024
USD ($)
credit
T
Dec. 31, 2006
distributor
MW
Dec. 31, 2024
USD ($)
credit
T
Feb. 13, 2019
USD ($)
Mar. 31, 2017
Oct. 15, 2012
Property, plant and equipment | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount $ 213.8       $ 213.8   $ 213.8      
24 Distributos (CCEAR) | Electric Power | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term supply commitment, term           15 years        
Number of distributors | distributor           24        
Long-term supply commitment, electric demand | MW           200        
Vale S.A. | Iron Ore, Pellets and Iron Ore Fines | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, total purchased volume | T         8,000          
Primetals Technologies Brazil Ltda. | Maintenance Services | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 124.1       $ 124.1   124.1      
Air Liquide Brasil Ltda., AirSteel Ltda., White Martins Gases Industriais Ltda., White Martins Steel Ltda. and ThyssenKrupp MinEnergy GmbH | Industrial Gas | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 117.3       117.3   117.3      
GE Global Parts and Products GMBH, General Electric International Inc. and Alstom Energia Térmica e Indústria Ltda. | Turbine Maintenance | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 147.4       $ 147.4   147.4      
Long-term purchase commitment, term                 20 years  
Long-term purchase commitment, renewal period         4 years          
Companhia Distribuidora de Gás do Rio de Janeiro | Natural Gas | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, renewal period       2 years            
Long-term purchase commitment, minimum percentage of volume required       85.00%            
Vix Logistica S.A. | Logistics Supply Chain Operations | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 33.6       $ 33.6   33.6      
Petrobras S.A. | Natural Gas | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 122.4       122.4   122.4      
Petrobras S.A. | Petcoke | Ternium Brasil Ltda.                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 61.2       61.2   61.2      
Petrobras S.A. | Petcoke | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 48.4       $ 48.4   48.4      
Long-term purchase commitment, minimum volume | T         96          
MBL Materiais Básicos Ltda. | Iron Ore | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 261.1       $ 261.1   $ 261.1      
Long-term purchase commitment, term                   30 years
Long-term purchase commitment, minimum volume | T             3,600      
Cemig S.A. | Electric Power | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 187.0       187.0   $ 187.0      
Cemig S.A. | Electric Power | Usiminas | Bottom of range                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, electrical demand | MW     32              
Cemig S.A. | Electric Power | Usiminas | Top of range                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, electrical demand | MW     65.4              
Engie S.A | Electric Power | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 38.0       38.0   38.0      
Canadian Solar S.A. | Solar Energy | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 256.3       256.3   256.3      
Enel S.A | Electric Power | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount 39.2       39.2   39.2      
Comgas S.A | Natural Gas | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount $ 54.4       $ 54.4   $ 54.4      
Long-term purchase commitment, contracted daily capacity | m³ 250                  
Capacity deviation 5.00%       5.00%   5.00%      
Annual take or pay volume 80.00%       80.00%   80.00%      
Gasmig S.A. | Natural Gas | Usiminas                    
Disclosure of contingent liabilities [line items]                    
Long-term purchase commitment, amount $ 93.5       $ 93.5   $ 93.5      
Long-term purchase commitment, contracted daily capacity | m³   850                
Capacity deviation   10.00%                
Annual take or pay volume   80.00%                
Syndicated Loan | Techgen S.A. de C.V.                    
Disclosure of contingent liabilities [line items]                    
Original principal amount               $ 640.0    
Borrowings outstanding 49.6       49.6   49.6      
Ternium S.A. | Syndicated Loan | Techgen S.A. de C.V.                    
Disclosure of contingent liabilities [line items]                    
Guarantor obligations, outstanding $ 23.8       $ 23.8   $ 23.8      
Ternium S.A. | Syndicated Loan | Techgen S.A. de C.V.                    
Disclosure of contingent liabilities [line items]                    
Number of stand-by letters of credit | credit 2       2   2      
Guarantor obligations, percentage         48.00%