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Related party disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Related party disclosures        
Short-term benefits $ 0.9 $ 0.9 $ 1.9 $ 1.7
Share-based payments 0.1 5.0 3.5 5.9
Total $ 1.0 $ 5.9 $ 5.4 $ 7.6