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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments: a-l) (Details)
MMBTU in Thousands, m³ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
m³
Dec. 30, 2019
MMBTU
May 09, 2018
MMBTU
Apr. 24, 2017
MW
Dec. 31, 2024
USD ($)
m³
Jun. 30, 2008
USD ($)
Techgen S.A. de C.V. | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Guarantor obligations, outstanding $ 58.7       $ 58.7  
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A. | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required         80.00%  
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario one | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required         80.00%  
Long-term purchase commitment, percentage of penalty         7.00%  
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario one | Bottom of range | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, percentage of total volume actually operated         70.00%  
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario one | Top of range | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, percentage of total volume actually operated         75.00%  
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario two | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required         80.00%  
Long-term purchase commitment, percentage of penalty         15.00%  
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario two | Bottom of range | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, percentage of total volume actually operated         70.00%  
Industrial Gas | Air Liquide Argentina S.A. | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount $ 58.8       $ 58.8  
Industrial Gas | Praxair Mexico | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount           $ 421.0
Long-term purchase commitment , minimum annual consumption, volume | m³ 96       96  
Long-term purchase commitment , minimum annual consumption, amount $ 4.5       $ 4.5  
Natural Gas | Tecpetrol | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount 10.2       10.2  
Natural Gas | Transportadora de Gas del Norte S.A. and Energy Consulting Services S.A. | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount 28.5       28.5  
Natural Gas | Gas Industrial de Monterrey, S.A. de C.V. | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount 19.1       19.1  
Guarantor obligations, amount 28.8       28.8  
Long-term purchase commitment, obligations outstanding 9.5       9.5  
Property, plant and equipment | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount 35.8       35.8  
Property, plant and equipment | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount 1,300.0       1,300.0  
Wind Generation Farm | Ternium Argentina            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount 62.0       62.0  
Electric Power | Techgen S.A. de C.V. | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, term       25 years    
Long-term purchase commitment, electrical demand | MW       699    
Percentage of electricity capacity supplied       78.00%    
Natural Gas Transportation | Kinder Morgan Texas Pipeline L.L.C., Kinder Morgan Tejas Pipeline L.L.C. and Kinder Morgan Border Pipeline L.L.C. | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, term     10 years      
Long-term purchase commitment, contracted daily capacity | MMBTU     60      
Long-term purchase commitment, annual cost 3.7       3.7  
Natural Gas Transportation | Kinder Morgan Texas Pipeline L.L.C., Kinder Morgan Tejas Pipeline L.L.C. and Kinder Morgan Gas Natural de México S. de R.L. de C.V. | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, term   15 years        
Long-term purchase commitment, contracted daily capacity | MMBTU   31        
Long-term purchase commitment, annual cost 4.8       4.8  
Natural Gas Transportation | Kinder Morgan Gas Natural de Mexico, S. de R.L. de C.V., Kinder Morgan Texas Pipeline LLC, Kinder Morgan Tejas Pipeline LLC | Ternium Mexico            
Disclosure of contingent liabilities [line items]            
Guarantor obligations, outstanding $ 79.1       79.1  
Guarantor obligations, percentage 48.00%          
Natural Gas Transportation | Kinder Morgan Gas Natural de Mexico, S. de R.L. de C.V., Kinder Morgan Texas Pipeline LLC, Kinder Morgan Tejas Pipeline LLC | Techgen            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, obligations outstanding $ 164.8       $ 164.8