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ACCOUNTING POLICIES (Non-current assets (disposal groups) classified as held for sale) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of significant accounting policies [Abstract]
Non-current assets or disposal groups classified as held for sale	$ 5.0	$ 2.1

X

- 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 2020-01-01
-Paragraph 38
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_38&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of significant accounting policies [Abstract]

+ References

No definition available.

+ Details

Name:	tx_DisclosureofsignificantaccountingpoliciesAbstract
Namespace Prefix:	tx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration