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Equity-settled share-based payments - Key Grant Date Fair Value and Other Assumptions (Details) - $ / shares
Apr. 20, 2022
Apr. 01, 2022
May 13, 2021
Apr. 01, 2021
May 12, 2020
Apr. 01, 2020
Share-Based Payment Arrangements [Abstract]            
Grant date, fair value (USD per share) $ 12.60 $ 10.87 $ 9.54 $ 7.84 $ 7.45 $ 5.65