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Basis of preparation and presentation of the consolidated financial statements (Schedule of Subsidiaries) (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 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 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 95.10% 95.10%
Grupo Chant, S.A.P.I. de C.V. [Member]    
Disclosure of subsidiaries [line items]    
Percentage of equity owned 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%
Gases Industriales 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% 99.41%
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 [9] 100.00% 100.00%
GS Steel B.V. [Member]    
Disclosure of subsidiaries [line items]    
Percentage of equity owned [10]
[1] Companies that have lost the entire capital stock, except Operadora de Metales, S.A. de C.V. and Corporativos G&DL, 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, 2020.
[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] Companies established in Brazil.
[10] Company established in Netherlands.