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Equity settled share-based transactions - Movement of restricted shares (Details)
 12 Months Ended
Dec. 31, 2022
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Dec. 31, 2021
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Disclosure of terms and conditions of share-based payment arrangement [line items]    
Outstanding at the beginning of the year (in shares) 0  
Vested and not subject to claw-back during the year 1,102,111  
Outstanding at the end of the year (in shares) 2,360,267 0
Restricted shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Outstanding at the beginning of the year (in shares) 0 451,682
Vested and not subject to claw-back during the year   (451,682)
Outstanding at the end of the year (in shares)   0