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Deferred income tax - Additional information (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Deferred income tax    
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised $ 35,700,000 $ 35,700,000
Current income taxes 17,059,000 28,046,000
Assets for current income taxes 15,150,000 28,046,000
Non-current portion income tax 1,909,000  
Liability for income taxes $ 6,274,000 $ 2,366,000