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Basis of Preparation and Presentation of the Consolidated Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of basis of preparation of financial statements [text block] [Abstract] |
Schedule of subsidiaries |
|  | Percentage of equity owned |
|  | 2021 |  |  | 2020 |
Subsidiaries established in Mexico: |  |  |  |  |  |
Compañía Siderúrgica de Guadalajara, S.A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Arrendadora Simec, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Simec International, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Compañía Siderúrgica del Pacifico, S.A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Coordinadora de Servicios Siderúrgicos de Calidad, S.A. de C.V. (8) |  |  | 100.00 | % |  |  | 100.00 | %
Industrias del Acero y del Alambre, S.A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Procesadora Mexicali, S.A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Servicios Simec, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Sistemas de Transporte de Baja California, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Operadora de Servicios Siderúrgicos de Tlaxcala, S.A. de C.V. (8) |  |  | 100.00 | % |  |  | 100.00 | %
Operadora de Metales, S.A. de C.V. (8) |  |  | 100.00 | % |  |  | 100.00 | %
Administradora de Servicios Siderúrgicos de Tlaxcala, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
CSG Comercial, S.A. de C.V. |  |  | 99.95 | % |  |  | 99.95 | %
Operadora de Servicios de la Industria Siderúrgica ICH, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Corporación Aceros DM, S.A. de C.V. and subsidiaries (1) |  |  | 100.00 | % |  |  | 100.00 | %
Acero Transportes San, S.A. de C.V. (1) |  |  | 100.00 | % |  |  | 100.00 | %
Simec Acero, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Corporación ASL, S. A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Simec International 6, S.A. de C.V. (8) |  |  | 100.00 | % |  |  | 100.00 | %
Simec International 7, S.A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Simec International 9, S.A.P.I. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Corporativos G&DL, S.A. de C.V. (8) |  |  | 100.00 | % |  |  | 100.00 | %
Orge, S.A. de C.V. |  |  | 99.99 | % |  |  | 99.99 | %
Siderúrgica del Occidente y Pacifico, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
RRLC, S.A.P.I. de C.V. |  |  | 95.10 | % |  |  | 95.10 | %
Grupo Chant, S.A.P.I. de C.V. |  |  | 97.61 | % |  |  | 97.61 | %
Aceros Especiales Simec Tlaxcala, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Gases Industriales de Tlaxcala, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
GSIM de Occidente S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Fundiciones de Acero Estructural, S.A. de C.V. |  |  | 100.00 | % |  |  | 100.00 | %
Siderúrgicos Noroeste, S.A. de C.V. (9) |  |  | 100.00 | % |  |  | 100.00 | %
Simec Siderúrgico, S.A. de C.V. (2) |  |  | 100.00 | % |  |  | 100.00 | %
Subsidiaries established in foreign countries: |  |  |  |  |  |  |  |
SimRep Corporation and Subsidiaries (3) (4) (5) |  |  | 99.41 | % |  |  | 99.41 | %
Pacific Steel, Inc. (4) |  |  | 100.00 | % |  |  | 100.00 | %
Pacific Steel Projects, Inc. (4) |  |  | 100.00 | % |  |  | 100.00 | %
Simec Steel, Inc. (4) |  |  | 100.00 | % |  |  | 100.00 | %
Simec USA, Corp. (4) |  |  | 100.00 | % |  |  | 100.00 | %
Undershaft Investments, NV. (6) |  |  | 100.00 | % |  |  | 100.00 | %
GV do Brasil Industria e Comercio de Aço LTDA (7) |  |  | 100.00 | % |  |  | 100.00 | %
Companhia Siderurgica do Espiritu Santo S.A. (2) (7) |  |  | 100.00 | % |  |  | 100.00 | %
Schedule of relevant exchange rates used |
Current exchange rate as of December 31, 2021 |  |  | 20.52 |
Current exchange rate as of December 31, 2020 |  |  | 19.95 |
Average exchange rate for the year ended December 31, 2021 (*) |  |  | 20.28 |
Average exchange rate for the year ended December 31, 2020 (*) |  |  | 21.49 |
Current exchange rate as of May 17, 2022 |  |  | 20.14 |
Schedule of estimated useful lives of assets |
|  | Years |
Buildings |  | 10 to 65 |
Machinery and equipment |  | 5 to 40 |
Transportation equipment |  | 4 |
Furniture, chattels and computer equipment |  | 3 to 10 |

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