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Share-based payments - Former Chief Executive Officer Grant - Reconciliation of outstanding awards (Details) - Former Chief Executive Officer Grant - Option
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based payments      
Outstanding at the beginning of the period 5,614,246 6,426,365 7,951,265
Forfeited during the period (11,091) (34,859)  
Exercised during the period   (777,260) (1,524,900)
Outstanding at the end of the period 5,603,155 5,614,246 6,426,365