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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