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Legal and other reserves - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reserves within equity [abstract]    
Legal and other reserve $ 23,302,000 $ 26,124,000
Distributable retained earnings 0  
Retained earnings, unappropriated amount distributable $ 754,009,000