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Contingencies (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 MXN ($) | Nov. 06, 2017 USD ($) | Sep. 05, 2017 USD ($) | Dec. 31, 2012 MXN ($) | Dec. 31, 2004 USD ($) | Jul. 26, 2004 USD ($)
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  | $ 4,179,830,000 |  | $ 5,347,325,000 |  |  |  |  |  |  |
Amount of lawsuit |  |  |  |  |  | $ 5,880,000,000 |  |  |  |  |  |  |  |
Amount of tax payments and expenses increase (decrease) |  |  | $ 554,400,000 |  | $ 2,323,700,000 |  |  |  |  |  |  |  |  |
Consideration of sales and used tax |  |  |  |  |  |  |  |  | $ 1,631,827,000 |  |  | $ 2,452,028,000 |  |
Interest on sales and used tax |  |  |  |  |  |  |  |  | $ 339,885,000 |  |  | $ 394,138,000 |  |
USD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental liabilities |  | $ 2,500,000 |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |
Accounts payable |  | 1,000,000 |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Accumulated liabilities |  | 1,500,000 |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |
Amount of claims the payments |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |
Amount of add up |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |
USD [Member] | 2015-2016 Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax payments and expenses increase (decrease) |  | 4,178,517 |  |  |  |  |  |  |  |  |  |  |  |
USD [Member] | 2017-2018 Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax payments and expenses increase (decrease) |  | $ 6,372,306 |  |  |  |  |  |  |  |  |  |  |  |
USD [Member] | Individual and Joint Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arbitration settlement amount paid | $ 4,500,003 |  |  |  |  |  |  |  |  |  |  |  |  |
Pacific Steel [Member] | USD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent amount to pay |  |  |  |  |  |  |  |  |  |  |  |  | $ 138,000 | $ 200,000

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