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Related parties - Key management personnel (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related parties      
Short-term employee benefits $ 5.6 $ 5.9 $ 5.4
Share-based compensation 5.7 9.4 0.2
Long-term employee benefits $ 0.5 $ 0.5 $ 0.4