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II. ACCOUNTING POLICIES (Details Textual 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of associates [line items]      
Proportion of ownership interest in subsidiary 50.00%    
Number of outstanding shares 1,084,272,191 1,167,888,739 1,180,536,830
Ternium S.A. [member]      
Disclosure of associates [line items]      
Proportion of ownership interest in associate 11.46%    
Treasury shares [member]      
Disclosure of associates [line items]      
Number of outstanding shares 78,485,337 12,648,091  
Italy      
Disclosure of associates [line items]      
Net defined benefit liability (asset) at end of period $ 10.1    
Canada      
Disclosure of associates [line items]      
Net defined contribution plan liability (asset) at end of period 9.0    
USA      
Disclosure of associates [line items]      
Net defined contribution plan liability (asset) at end of period 3.0    
Unfunded defined benefit employee retirement plan for certain senior officers [member]      
Disclosure of associates [line items]      
Net defined benefit liability (asset) at end of period $ 59.4    
Techgen S.A. [member] | Ternium S.A. [member]      
Disclosure of associates [line items]      
Proportion of ownership interest in joint venture 48.00%    
Techgen S.A. [member] | Tecpetrol International S.A. [member]      
Disclosure of associates [line items]      
Proportion of ownership interest in joint venture 30.00%    
Techgen S.A. [member] | Tenaris [member]      
Disclosure of associates [line items]      
Proportion of ownership interest in joint venture 22.00%