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ACCOUTNING POLICIES (Derivative financial instruments and hedging activities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flow hedges |  |
Derivative instruments, gain (loss) [Line Items] |  |
Effective portion of hedge | $ (0.2) | $ (0.1)

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- Definition Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion + References No definition available. + Details
Name: | tx_DerivativeInstrumentsGainRecognizedinOtherComprehensiveIncomeLossEffectivePortion
Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition [Line Items] for Derivative instruments, gain (loss) [Table] + References No definition available. + Details
Name: | tx_DerivativeinstrumentsgainlossLineItems
Namespace Prefix: | tx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfHedgesAxis=ifrs-full_CashFlowHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |