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Equity-settled share-based payments - Restricted Share and Restricted Stock Unit Plan (Details) - shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted shares      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Balance at beginning of period (shares) 1,766,000 1,222,000 750,000
Granted (shares) 1,406,000 1,067,000 751,000
Forfeited (shares) (43,000) (32,000) (24,000)
Vested (shares) (828,000) (491,000) (255,000)
Balance at end of period (shares) 2,301,000 1,766,000 1,222,000
Restricted Stock Units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Balance at beginning of period (shares) 0 174,000 508,000
Granted (shares)   0 0
Forfeited (shares)   0 (10,000)
Vested (shares)   (174,000) (324,000)
Balance at end of period (shares)   0 174,000