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SEGMENT INFORMATION (Segment reporting information, by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Net sales $ 8,735,435 $ 10,192,818 $ 11,454,807
Cost of sales (7,099,923) (8,452,440) (8,483,328)
Gross profit 1,635,512 1,740,378 2,971,479
Selling, general and administrative expenses (762,882) (897,475) (876,764)
Other operating income (expenses), net 206,843 21,663 13,656
Profit (loss) from operating activities 1,079,473 864,566 2,108,371
Financial income (expense), net 19,554 (39,756) (69,640)
Equity in earnings (losses) of non-consolidated companies 57,555 60,967 102,772
Profit before income tax expense 1,159,359 826,564 2,031,567
Inter-segment eliminations      
Disclosure of operating segments [line items]      
Net sales (334,619) (357,411) (280,613)
Cost of sales 341,617 359,588 281,455
Gross profit 6,998 2,177 842
Selling, general and administrative expenses 0 0 0
Other operating income (expenses), net 0 0 0
Profit (loss) from operating activities 6,998 2,177 842
Steel | Operating segments      
Disclosure of operating segments [line items]      
Net sales 8,679,513 10,186,171 11,453,420
Cost of sales (7,172,635) (8,552,493) (8,524,890)
Gross profit 1,506,878 1,633,679 2,928,530
Selling, general and administrative expenses (740,056) (885,146) (860,881)
Other operating income (expenses), net 208,965 21,931 12,950
Profit (loss) from operating activities 975,787 770,466 2,080,599
Mining | Operating segments      
Disclosure of operating segments [line items]      
Net sales 390,541 364,058 282,000
Cost of sales (268,905) (259,535) (239,893)
Gross profit 121,636 104,523 42,107
Selling, general and administrative expenses (22,826) (12,330) (15,883)
Other operating income (expenses), net (2,122) (268) 706
Profit (loss) from operating activities 96,688 91,924 26,930
Ternium      
Disclosure of operating segments [line items]      
Net sales 8,735,435 10,237,297 11,725,270
Profit (loss) from operating activities 1,149,249 989,982 1,853,319
Financial income (expense), net 22,331 (98,969) (179,576)
Equity in earnings (losses) of non-consolidated companies 57,555 60,967 102,772
Profit before income tax expense 1,159,359 826,564 2,031,567
Depreciation and amortisation expense (631,051) (661,112) (589,299)
Ternium | Inter-segment eliminations      
Disclosure of operating segments [line items]      
Net sales (328,333) (410,972) (332,505)
Profit (loss) from operating activities 689 2,177 (6,213)
Depreciation and amortisation expense 0 0 0
Ternium | Reconciling items      
Disclosure of operating segments [line items]      
Cost of sales 69,776 (99,315) (541,492)
Effect of inflation adjustment (Note 3 (cc))   (224,731) (286,440)
Ternium | Steel | Operating segments      
Disclosure of operating segments [line items]      
Net sales 8,679,513 10,230,650 11,723,883
Profit (loss) from operating activities 1,046,623 841,169 1,768,115
Depreciation and amortisation expense (580,807) (612,744) (537,885)
Ternium | Mining | Operating segments      
Disclosure of operating segments [line items]      
Net sales 384,255 417,619 333,892
Profit (loss) from operating activities 101,937 146,636 91,418
Depreciation and amortisation expense $ (50,244) $ (48,368) $ (51,415)