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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
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expenses by nature [abstract]      
Raw materials and consumables $ 16,343,140 $ 16,411,788 $ 15,565,242
Electrical energy 2,820,667 3,303,640 2,536,387
Ferroalloys 1,617,352 2,137,671 1,973,586
Refractories 629,758 707,214 613,563
Oxygen 248,029 276,648 279,272
Electrodes 434,265 1,293,096 1,463,091
Gas and fuels 767,823 962,001 766,163
Labor 1,831,225 2,042,433 3,181,556
Operation materials 1,033,597 919,893 954,415
Depreciation and amortization 1,452,271 1,108,629 1,112,418
Maintenance 1,262,728 2,221,595 2,243,255
Other expenses 2,790,197 319,958 954,379
Total expense 31,231,052 31,704,566 31,643,327
Cost of sales 29,211,724 30,067,141 30,563,315
Administrative expenses $ 2,019,328 $ 1,637,425 $ 1,080,012