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Capital and reserves - Reconciliation of outstanding share options (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
shares
$ / shares
Dec. 31, 2021
USD ($)
shares
$ / shares
Dec. 31, 2020
USD ($)
shares
$ / shares
Capital and reserves      
Outstanding at the beginning of the period | shares 714,322 4,990,000  
Granted during the period | shares 2,325,215 546,822  
Exercised during the period | shares (406,733) (4,822,500)  
Fortified during the period | shares (171,374)    
Outstanding at the end of the period | shares 2,461,430 714,322 4,990,000
Exercisable at the end of the period | shares   167,500  
Weighted average exercise price, beginning of the period | $ / shares $ 8.04 $ 1  
Weighted average exercise price, Granted | $ / shares 65.34 15  
Weighted average exercise price, Exercised | $ / shares 0 0.75  
Weighted average exercise price, ending of the period | $ / shares 37.05 8.04 $ 1
Weighted average exercise price, Exercisable | $ / shares   $ 0  
Weighted average share price | $ / shares $ 54.22    
Weighted average contractual life of the outstanding options 4 years 1 month 6 days    
Share-based compensation expense | $ $ 25.8 $ 20.8 $ 0.5