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Share-based payment arrangements - Summary of Status and Movements in RSUs and PSUs (Details) - Options
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restricted Shares Without Performance Criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance (in shares) 333,119 341,198
Granted (in shares) 391,092 214,859
Redeemed (in shares) (137,594) (181,491)
Forfeited (in shares) (50,287) (41,447)
Ending balance (in shares) 536,330 333,119
Restricted Shares With Performance Criteria    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance (in shares) 152,927 0
Granted (in shares) 412,473 167,976
Forfeited (in shares) (107,902) (15,049)
Ending balance (in shares) 457,498 152,927
Performance share unit    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Beginning balance (in shares) 484,899 381,293
Granted (in shares) 264,083 261,522
Redeemed (in shares) (129,109) (118,605)
Forfeited (in shares) (8,988) (39,311)
Ending balance (in shares) 610,885 484,899