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Share-based compensation - Disclosure of number and weighted average exercise prices of share options (Details)
12 Months Ended
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of share options outstanding, beginning of period | shares 4,240,869 4,939,344
Weighted average exercise price share options, beginning of period | $ / shares $ 14.22 $ 14.40
Number of share options granted | shares 763,700 1,201,100
Weighted average exercise price of share options granted | $ / shares $ 13.27 $ 13.51
Number of share options exercised | shares (1,043,903) (673,470)
Weighted average exercise price of share options exercised | $ / shares $ 13.75 $ 11.27
Number of share options forfeited | shares (58,866) (341,300)
Weighted average exercise price of share options forfeited | $ / shares $ 13.45 $ 13.61
Number of share options expired | shares (171,220) (884,805)
Weighted average exercise price of share options expired | $ / shares $ 16.04 $ 16.56
Number of share options outstanding, end of period | shares 3,730,580 4,240,869
Weighted average exercise price share options, end of period | $ / shares $ 14.09 $ 14.22
Number of share options exercisable | shares 1,881,416 2,988,713
Weighted average exercise price of share options exercisable | $ / shares $ 14.78 $ 14.96