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Equity settled share-based transactions - Number and Weighted Average Exercise Prices of Share Options (Details) - Share options
 12 Months Ended
Dec. 31, 2021
Options
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Outstanding at the beginning of year (in dollars per share) | $ / shares $ 0.01
Forfeited (in dollars per share) | $ / shares 0.01
Rolled up to the Restricted Share Scheme (in dollars per share) | $ / shares $ 0.01
Rolled up to the Restricted Share Scheme | shares (10,751,220)
Outstanding at the beginning of year (in shares) | Options 10,757,396
Forfeited (in shares) | Options (6,176)
Outstanding at the end of year (in shares) | Options 0