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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Reserve of cash flow hedges, net of tax | $ 0.5 | $ (0.6) | $ (0.4) |  |
Interest rate swap contracts |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Other comprehensive income that will be reclassified to profit or loss, before tax | $ 0.7 |  |  |  |
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 | $ 100.0
Derivative, average fixed interest rate | 1.92% |  |  |  |
Reserve of cash flow hedges, net of tax | $ 0.5 |  |  |  |
Non-deliverable forward contract | Ternium Colombia S.A.S (formerly Ferrasa S.A.S) |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount | 30.0 |  |  |  |
Forward contract | Ternium Mexico S.A. de C.V. |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount | 228.2 |  |  |  |
Forward contract | Ternium Investments S.à.r.l. |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount | $ 28.7 |  |  |  |

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