The amount of instruments issued by the entity that represent indebtedness.

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The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Total for all associates [member]; Investments in associates reported in separate financial statements]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Total for all business combinations [member]]

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The amount of any gain recognised in a business combination in which the net of the identifiable assets acquired and the liabilities assumed exceeds the aggregate of the consideration transferred, non-controlling interest in the acquiree and fair value of the acquirer's previously held equity interest in the acquiree. [Refer: Total for all business combinations [member]]

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The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Total for all associates [member]; Total for all joint ventures [member]; Total for all subsidiaries [member]; Investments in subsidiaries reported in separate financial statements]

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The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

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The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]]

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-Number 27
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The proportion of the voting rights in an associate held by the entity. [Refer: Total for all associates [member]]

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The amount of a closing price per American Depositary Security (ADS) as quoted on the New York Stock Exchange. Each ADS equals two shares.

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The percent amount of covered debt service coverage ratio.

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Represents the amount of divdends declared by nonconsolidated companies.

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The amount of exposure to the purchase of clean energy certificates.

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Represents the amount of exposure risk from transportation capacity agreements.

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The amount of impairment loss recognised in profit or loss in non-consolidated companies.

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The amount of loans and receivables principle outstanding.

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Represents the proportion of a corporate guarantee that covers obligations made under a syndicated loan agreement.

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Note 14 - Investments in non-consolidated companies (Details Textual) $ / shares in Units, $ in Thousands		12 Months Ended
	May 17, 2023 USD ($)	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 R$ / shares	Feb. 13, 2019 USD ($)
Disclosure of unconsolidated structured entities [line items]
Total investments in subsidiaries, joint ventures and associates		$ 1,543,657	$ 1,608,804	$ 1,540,646
Bargain purchase gain		2,212	3,162
Impairment loss in non-consolidated companies				34,041
Dividends and distributions declared		$ 71,212	69,216
Proportion of ownership interest in subsidiary		50.00%
PAO Severstal [member]
Disclosure of unconsolidated structured entities [line items]
Impairment loss in non-consolidated companies				14,900
Techgen S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Total investments in subsidiaries, joint ventures and associates			59,800
Ternium and Usiminas [member]
Disclosure of unconsolidated structured entities [line items]
Dividends and distributions declared		$ 73,800	$ 68,800
Usiminas [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of voting rights held in associate		6.76%	6.76%
Fair value of investments in associates for which there are quoted market prices		$ 41,900
Total investments in subsidiaries, joint ventures and associates		$ 102,800
Proportion of ownership interest in associate		3.96%
Loss Recognised Due to Particiaption Increase in Nonconsolidated Companies			$ 25,500
Impairment loss in non-consolidated companies				$ 19,100
Usiminas [member] \| Ordinary shares [member]
Disclosure of unconsolidated structured entities [line items]
Closing price, per share (in BRL per share) \| (per share)		$ 0.86			R$ 5.32
Usiminas [member] \| Preference shares [member]
Disclosure of unconsolidated structured entities [line items]
Closing price, per share (in BRL per share) \| (per share)		0.86			R$ 5.32
Ternium S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Closing price, per ads (in dollars per share) \| $ / shares		$ 29.08
Fair value of investments in associates for which there are quoted market prices		$ 668,000
Total investments in subsidiaries, joint ventures and associates		1,377,900
Techgen S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Total investments in subsidiaries, joint ventures and associates		$ 59,782	$ 53,556
Proportion of ownership interest in associate		22.00%	22.00%
Exposure to transportation capacity agreements		$ 36,300
Exposure to the purchase of clean energy certificates		16,600
Techgen S.A. [member] \| Tenaris [member]
Disclosure of unconsolidated structured entities [line items]
Loans and receivables		$ 67,400
Proportion of corporate guarantee covering obligations		22.00%
Techgen S.A. [member] \| Several banks, to refinance obligations [member]
Disclosure of unconsolidated structured entities [line items]
Debt instruments issued						$ 640,000
Techgen S.A. [member] \| Tecpetrol International S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of ownership interest in associate		30.00%
Techgen S.A. [member] \| Tenaris SA [member]
Disclosure of unconsolidated structured entities [line items]
Debt service coverage ratio, covered, percent		22.00%
Letters of credit, covered		$ 10,900
Techgen S.A. [member] \| Ternium S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of ownership interest in associate		48.00%
Techgen S.A. [member] \| Ternium S.A. [member] \| Tecpetrol International S.A. [member] \| Tenaris [member]
Disclosure of unconsolidated structured entities [line items]
Loans and receivables		$ 306,500
Global Pipe Company [Member]
Disclosure of unconsolidated structured entities [line items]
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination	$ 4,500
Bargain purchase gain	$ 11,500