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Equity-settled share-based payments - Options Schemes (Details) - Stock Options, 2004 Stock Incentive Option Plan
shares in Thousands
 12 Months Ended
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Average exercise price at beginning of period (in USD per share) | $ / shares $ 6.66 $ 6.66 $ 6.66
Average exercise price, exercised (in USD per share) | $ / shares 5.83 6.77 0
Average exercise price at end of period (in USD per share) | $ / shares $ 6.66 $ 6.66 $ 6.66
Options at beginning of period (shares) | shares 1,321 1,634 1,634
Exercised (shares) | shares (37) (313) 0
Options at end of period (shares) | shares 1,284 1,321 1,634