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ACCOUNTING POLICIES (Non-current assets (disposal groups) classified as held for sale) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of significant accounting policies [Abstract] |  |
Non-current assets or disposal groups classified as held for sale | $ 2.1 | $ 2.8

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- Definition The amount of non-current assets or disposal groups classified as held for sale. [Refer: Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2017-01-01 -Paragraph 38 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_38&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of significant accounting policies [Abstract] + References No definition available. + Details
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Namespace Prefix: | tx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration