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Property, plant and equipment (Narrative) (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 MXN ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Depreciation expense | $ 1,441,021 | $ 1,098,749 |  |  |  |  |  |  |  |
Net Book Value |  |  |  |  | $ 15,950,352 |  | $ 16,737,595 | $ 16,971,000 |  |
Lorain Ohio facility [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Net Book Value |  |  |  |  | $ 803,000 |  | $ 783,000 |  |  | $ 2,701,000
Lorain Ohio facility [Member] | USD [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Net Book Value |  |  |  | $ 40,300 |  | $ 41,500 |  |  | $ 130,700 |
Electric arc furnace and auxiliar facilities expenses |  |  | $ 158,800 |  |  |  |  |  |  |
Labor and capitalized indirect expenses |  |  | $ 45,400 |  |  |  |  |  |  |

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Amount of electric arc furnace and auxiliar facilities expenses during the period. + References No definition available. + Details
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- Definition Amount of labor and capitalized indirect expenses during the period. + References No definition available. + Details
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- Details
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