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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)

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