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Related party transactions - Summary of Remuneration of Directors (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of transactions between related parties [abstract]    
Salaries $ 0.9 $ 0.8
Share-based compensation 2.3 5.5
Fees and benefits 1.0 0.9
Post employment benefits 0.1 0.0
Total remuneration of key management personnel $ 4.3 $ 7.2