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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Reserve of cash flow hedges, net of tax | $ (0.2) | $ (0.1) | $ 0.5 |
Other comprehensive loss that will be reclassified to profit or loss, before tax | 0.2 |  |  |
Interest rate swap contracts | Tenigal S. de R.L. de C.V. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  |  |  | $ 100.0
Derivative, average fixed interest rate |  |  |  | 1.92%
Reserve of cash flow hedges, net of tax | (0.2) |  |  |
Non-deliverable forward contract | Ternium Colombia S.A.S |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 75.4 |  |  |
Non-deliverable forward contract | Ternium Investments S.a.r.l. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 3.4 |  |  |
Forward contract | Ternium Mexico S.A. de C.V. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 59.2 |  |  |
Forward contract | Ternium Investments S.a.r.l. |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ 4.9 |  |  |

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