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Income taxes (Narrative) (Details) R$ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Effective tax rate | 54.26% | 54.26% | 54.26% | 17.92% | 17.92% | 37.21% |
Amount of tax payments and expenses increase (decrease) |  | $ 2,323,662 |  |  |  |  |
USD [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses |  | 9,268,569 |  |  |  |  |
GV do Brasil Industria e Comercio of Aco LTDA [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses |  | 985,000 |  | $ 1,025,000 |  |  |
GV do Brasil Industria e Comercio of Aco LTDA [Member] | Brazil, Brazil Real [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses | R$ |  |  | R$ 210,345 |  | R$ 202,008 |  |
Companhia Siderurgica do Espirito Santo S.A. [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses |  | $ 94,000 |  |  |  |  |
Companhia Siderurgica do Espirito Santo S.A. [Member] | Brazil, Brazil Real [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses | R$ |  |  | R$ 20,042 |  |  |  |
Mexican companies [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Effective tax rate | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% |  |
Description of decree issued by finance ministry | As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR. Taxpayers who had business income of up to 100 million pesos, | As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR. Taxpayers who had business income of up to 100 million pesos, | As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR. Taxpayers who had business income of up to 100 million pesos, |  |  |  |
Percentage of investment of new fixed assets | 69.00% | 69.00% | 69.00% |  |  | 85.00% | 82.00%
Amount of tax payments and expenses increase (decrease) |  | $ 2,323,662 |  |  |  |  |
Republic [Member] | USD [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses | $ 249,700 |  |  |  |  |  |
Expiration period | expire between 2033 and 2038 | expire between 2033 and 2038 | expire between 2033 and 2038 |  |  |  |
State and local [Member] | USD [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses | $ 323,600 |  |  |  |  |  |
Expiration period | expire between 2020 and 2039 | expire between 2020 and 2039 | expire between 2020 and 2039 |  |  |  |
Canada [Member] | USD [Member] |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |
Tax losses | $ 5,500 |  |  |  |  |  |
Expiration period | expire between 2032 and 2039 | expire between 2032 and 2039 | expire between 2032 and 2039 |  |  |  |

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