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Share-based payment arrangements - Summary of status and movements in RSUs and PSUs (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restricted Shares Without Performance Criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
At January 1, 536,330 333,119
Granted 149,552 391,092
Redeemed (in shares) (190,963) (137,594)
Forfeited (in shares) (16,852) (50,287)
At December 31, 478,067 536,330
Restricted share units with performance criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
At January 1, 457,498 152,927
Granted 299,112 412,473
Forfeited (in shares) (66,643) (107,902)
At December 31, 689,967 457,498
Performance share unit    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
At January 1, 610,885 484,899
Granted 0 264,083
Redeemed (in shares) (85,280) (129,109)
Forfeited (in shares) 0 (8,988)
At December 31, 525,605 610,885