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Shareholders' contributions (Tables)
 12 Months Ended
Dec. 31, 2019
Statement of changes in equity [abstract]  
Schedule of Share Capital
 
Number of shares
 
Share capital and
share premium
At January 1, 2017
122,382

 
1,120,823

Employee share options exercised (Note 24) (1)
—

 
50

Restricted shares and units vested (Note 24)
—

 
4,149

Purchase of own shares
—

 
(32,515
)
At December 31,2017
122,382

 
1,092,507

Restricted shares and units vested (Note 24)
—

 
4,775

Purchase of own shares
—

 
(13,206
)
At December 31,2018
122,382

 
1,084,076

Restricted shares units vested (Note 24)
—

 
4,455

Purchase of own shares
—

 
(3,219
)
At December 31,2019
122,382

 
1,085,312

 
(1)
Treasury shares were used to settle these options and units.