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BORROWINGS (Significant borrowings) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2018
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Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ 1,722,893,000 | $ 2,188,674,000 |
Tenigal Syndicated Loan Due July 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 200,000,000 |  |
Borrowings | 50,000,000 |  |
Ternium Investments S.à r.l Syndicated Loan Due September 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 1,500,000,000 |  |
Borrowings | 400,000,000 |  |
Ternium Mexico Syndicated Loan Due June 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 1,000,000,000 |  | $ 1,000,000,000
Borrowings | 500,000,000 |  |
Ternium Brazil Syndicated Loan Due August 2024 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 500,000,000 |  |
Borrowings | $ 500,000,000 |  |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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