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Equity-settled share-based payments - Option Expiry Dates and Exercise Prices (Details) - Stock Options, 2004 Stock Incentive Option Plan
shares in Thousands
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 6.66 $ 6.66 $ 6.66 $ 6.66
Number of share options outstanding in share-based payment arrangement (shares) | shares 1,284 1,321 1,634 1,634
May 1, 2034        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 5.83      
Number of share options outstanding in share-based payment arrangement (shares) | shares 400 400 496  
May 1, 2035        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 5.83      
Number of share options outstanding in share-based payment arrangement (shares) | shares 363 369 452  
January 1, 2036        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 5.83      
Number of share options outstanding in share-based payment arrangement (shares) | shares 94 124 142  
February 16, 2036        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 7.11      
Number of share options outstanding in share-based payment arrangement (shares) | shares 84 84 103  
October 1, 2036        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement (in USD per share) | $ / shares $ 8.62      
Number of share options outstanding in share-based payment arrangement (shares) | shares 343 344 441