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Basis of preparation and presentation of the consolidated financial statements (Schedule of Subsidiaries) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Compania Siderurgica de Guadalajara, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Arrendadora Simec, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Simec International, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Compania Siderurgica del Pacifico, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Coordinadora de Servicios Siderurgicos de Calidad, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
Industrias del Acero y del Alambre, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Procesadora Mexicali, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Servicios Simec, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Sistemas de Transporte de Baja California, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Operadora de Servicios Siderurgicos de Tlaxcala, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
Operadora de Metales, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
Administradora de Servicios Siderurgicos de Tlaxcala, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
CSG Comercial, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.95% | 99.95%
Operadora de Servicios de la Industria Siderurgica ICH, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Corporacion Aceros DM, S.A. de C.V. and subsidiaries [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [2] | 100.00% | 100.00%
Acero Transportes San, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [2] | 100.00% | 100.00%
Simec Acero, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
Corporacion ASL, S. A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Simec International 6, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
Simec International 7, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Simec International 9, S.A.P.I. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Corporativos G&DL, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 100.00% | 100.00%
Orge, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 99.99% | 99.99%
Siderurgica del Occidente y Pacifico, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
RRLC, S.A.P.I. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 95.10% | 95.10%
Grupo Chant, S.A.P.I. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [1] | 97.61% | 97.61%
Aceros Especiales Simec Tlaxcala, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Recursos Humanos de la Industria Siderurgica de Tlaxcala, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
GSIM de Occidente S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Fundiciones de Acero Estructural, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned |  | 100.00% | 100.00%
Siderurgicos Noroeste, S.A. DE C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [3] | 100.00% | 100.00%
Simec Siderurgico, S.A. de C.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [4] | 100.00% | 100.00%
SimRep Corporation and Subsidiaries [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [5],[6],[7] | 99.41% | 50.22%
Pacific Steel, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [5] | 100.00% | 100.00%
Pacific Steel Projects, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [5] | 100.00% | 100.00%
Simec Steel, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [5] | 100.00% | 100.00%
Simec USA, Corp. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [5] | 100.00% | 100.00%
Undershaft Investments, NV. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [8] | 100.00% | 100.00%
GV do Brasil Industria e Comercio de Aco LTDA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [9] | 100.00% | 100.00%
Companhia Siderurgica do Espiritu Santo S.A. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [4],[9] | 100.00% | 100.00%
GS Steel B.V. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Percentage of equity owned | [10] |  | 100.00%
[1] | Companies that have lost the entire capital stock, except Operadora de Metales, S.A. de C.V. which only have lost 2/3 of their capital stock.
[2] | Companies located in San Luis Potosi. For purposes of this report constitute the "Grupo San".
[3] | Company incorporated in 2017.
[4] | Company incorporated in 2018.
[5] | Companies established in the United States of America, except a subsidiary of SimRep which is established in Canada.
[6] | ICH owns 0.59% of the shares in this company at December 31, 2019.
[7] | SimRep as an individual company has no significant operations or assets, except for its investment in Republic Steel. For purposes of this report, these companies are named "Republic".
[8] | Company established in Curacao.
[9] | Company established in Brazil.
[10] | Company established in Netherlands.

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