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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) € in Millions | Jan. 02, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2013 USD ($)
--- | --- | --- | --- | ---
Interest rate swap contracts | Tenigal S. de R.L. de C.V. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  |  |  | $ 100,000,000
Derivative, average fixed interest rate |  |  |  | 1.92%
Non-deliverable forward contract | Ternium Colombia S.A.S |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | $ 81,200,000 |  |
Non-deliverable forward contract | Ternium Colombia S.A.S | Classification of Derivative Instrument |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Settlement amount | $ 37,600,000 |  |  |
Non-deliverable forward contract | Ternium Mexico S.A. de C.V. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | 0 |  |
Non-deliverable forward contract | Ternium Guatemala |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | 2,000,000 |  |
Non-deliverable forward contract | Ternium del Atlántico S.A.S |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | 94,700,000 |  |
Non-deliverable forward contract | Ternium del Atlántico S.A.S | Classification of Derivative Instrument |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Settlement amount | $ 40,000,000 |  |  |
Forward contract | Ternium Mexico S.A. de C.V. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | 605,300,000 | € 556.9 |
Forward contract | Ternium Procurement S.A. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | 1,000,000 |  |
Forward contract | Mineraçao Usiminas |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | 57,800,000 |  |
Swap contract | Ternium Mexico S.A. de C.V. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  | $ 8,400,000 |  |

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