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SUBSEQUENT EVENTS - Techgen Refinancing (Details) - Techgen Refinancing	Feb. 13, 2019 USD ($)
Disclosure of non-adjusting events after reporting period [line items]
Original principal amount	$ 640,000,000
Ternium S.A. and Ternium Investments S.a r.l.
Disclosure of non-adjusting events after reporting period [line items]
Percentage of the debt service coverage ratio covered by stand-by letters of credit	48.00%
Amount of the debt service coverage ratio covered by stand-by letters of credit	$ 21,400,000

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
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