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Cost of sales and expenses by their nature (Schedule of Cost of Sales and Administration Expenses) (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Expenses by nature [abstract] |  |  |
Raw materials and consumables | $ 16,411,788 | $ 15,565,242 | $ 11,268,400
Electrical energy | 3,303,640 | 2,536,387 | 2,123,658
Ferroalloys | 2,137,671 | 1,973,586 | 1,734,914
Refractories | 707,214 | 613,563 | 492,781
Oxygen | 276,648 | 279,272 | 213,838
Electrodes | 1,293,096 | 1,463,091 | 419,741
Gas and fuels | 962,001 | 766,163 | 612,605
Labor | 2,042,433 | 3,181,556 | 2,699,414
Operation materials | 919,893 | 954,415 | 1,000,752
Depreciation and amortization | 1,108,629 | 1,112,418 | 1,465,759
Maintenance | 2,221,595 | 2,243,255 | 2,586,507
Other expenses | 319,958 | 954,379 | 615,100
Total expense | 31,704,566 | 31,643,327 | 25,233,469
Cost of sales | 30,067,141 | 30,563,315 | 23,994,526
Administrative expenses | $ 1,637,425 | $ 1,080,012 | $ 1,238,943

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_103&doctype=Standard -URIDate 2019-03-27 + Details
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