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Shareholders' contributions (Tables)
12 Months Ended
Dec. 31, 2020
Statement of changes in equity [abstract]  
Schedule of Share Capital
 Number of sharesShare capital and
share premium
At January 1, 2018122,382 1,092,507 
Employee share options exercised (Note 24) (1)— — 
Restricted shares and units vested (Note 24)— 4,775 
Purchase of own shares— (13,206)
At December 31,2018122,382 1,084,076 
Restricted shares and units vested (Note 24)— 4,455 
Purchase of own shares— (3,219)
At December 31,2019122,382 1,085,312 
Restricted shares units vested (Note 24)— 4,182 
Purchase of own shares— (3,106)
At December 31,2020122,382 1,086,388 
 
(1)Treasury shares were used to settle these options and units.