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Equity-settled share-based payments - Restricted Share and Restricted Stock Unit Plan (Details) - shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted shares      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Balance at beginning of period (shares) 2,301,000 1,766,000 1,222,000
Granted (shares) 549,000 1,406,000 1,067,000
Forfeited (shares) (26,000) (43,000) (32,000)
Vested (shares) (1,035,000) (828,000) (491,000)
Balance at end of period (shares) 1,789,000 2,301,000 1,766,000
Restricted Stock Units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Balance at beginning of period (shares)   0 174,000
Granted (shares)     0
Forfeited (shares)     0
Vested (shares)     (174,000)
Balance at end of period (shares)     0