Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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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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- Definition

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

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- Definition

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

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Note 14 - Investments in non-consolidated companies - Principal Non-consolidated Companies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of unconsolidated structured entities [line items]
Value	$ 1,561,212	$ 1,543,657	$ 1,608,804
Proportion of ownership interest in subsidiary	50.00%
Ternium S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Value	$ 1,375,100
Ternium S.A. [member] \| LUXEMBOURG
Disclosure of unconsolidated structured entities [line items]
Percentage of ownership	11.46%	11.46%
Value	$ 1,375,115	$ 1,377,911
Usiminas [member]
Disclosure of unconsolidated structured entities [line items]
Value	$ 108,600
Proportion of ownership interest in subsidiary	3.96%
Usiminas [member] \| Brazil
Disclosure of unconsolidated structured entities [line items]
Percentage of ownership	3.96%	3.96%
Value	$ 108,574	$ 102,812
Techgen S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Percentage of ownership	22.00%
Techgen S.A. [member] \| Mexico
Disclosure of unconsolidated structured entities [line items]
Percentage of ownership	22.00%	22.00%
Value	$ 73,936	$ 59,782
Other [member]
Disclosure of unconsolidated structured entities [line items]
Value	$ 3,587	$ 3,152