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Share-based payment arrangements - Summary of status and movements in RSUs and PSUs (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restricted Shares Without Performance Criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
At January 1, 478,067 536,330
Granted 180,132 149,552
Redeemed (in shares) (135,833) (190,963)
Forfeited (in shares) (50,604) (16,852)
At December 31, 471,762 478,067
Restricted share units with performance criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
At January 1, 689,967 457,498
Granted 440,508 299,112
Redeemed (in shares) (160,470) 0
Forfeited (in shares) (61,628) (66,643)
At December 31, 908,377 689,967
Performance Share Unit    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
At January 1, 525,605 610,885
Granted 267,936 0
Expired (in shares) 0 (85,280)
Redeemed (in shares) (514,010) 0
Forfeited (in shares) (1,511) 0
At December 31, 278,020 525,605