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FOREIGN EXCHANGE RESTRICTIONS IN ARGENTINE SUBSIDIARIES - (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of subsidiaries [line items] |  |  |  |
Net sales | $ 8,735,435 | $ 10,192,818 | $ 11,454,807 |
Assets | 12,856,235 | 12,935,533 |  |
Liabilities | 4,413,082 | 5,220,660 |  |
Equity | 8,443,153 | 7,714,873 | $ 7,484,576 | $ 5,852,771
Financial assets | 2,427,576 | 2,093,373 |  |
Financial liabilities | 3,113,640 | 3,455,070 |  |
Ternium Argentina S.A. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Net sales | 1,823,000 | 1,789,000 |  |
Profit (loss) from continuing operations | 268,000 | 131,000 |  |
Assets | 3,268,000 | 2,969,000 |  |
Liabilities | 430,000 | 338,000 |  |
Equity | 2,838,000 | $ 2,631,000 |  |
Financial assets | 278,000 |  |  |
Financial liabilities | $ 165,000 |  |  |

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