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Share-based payments - Board of Directors Incentive Plan (BoDIP) (Details) - BODIP
1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2022
EquityInstruments
$ / shares
Dec. 31, 2021
EquityInstruments
$ / shares
Dec. 31, 2020
EquityInstruments
$ / shares
Share-based payments        
Vesting period 5 years 5 years    
Exercise price | $ / shares   $ 33.80 $ 32.23 $ 9.74
Shares available to be exercised | EquityInstruments   5,945,417 4,589,726 5,233,693