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Share-based payments - MIP I, assumptions (Details) - MIP I
12 Months Ended
Dec. 24, 2012
MXN ($)
Y
$ / shares
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
EquityInstruments
Share-based payments      
Dividend yield (%) 0.00%    
Volatility (%) 37.00%    
Risk-free interest rate (%) 5.96%    
Expected life of share options (years) | Y 8.8    
Exercise price of shares | $ / shares $ 5.31    
Exercise multiple 1.1    
Fair value of the stock at grant date | $ $ 1.73    
Shares exercised | EquityInstruments     2,780,000
Series A shares      
Share-based payments      
Shares exercised | EquityInstruments     2,780,000
Amount paid to Management Trust corresponding to exercised shares | $   $ 0 $ 14,773,000