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Risk management activities - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Assets $ 378,835,000 $ 383,748,000  
Cash 20,658,000 51,494,000  
Other assets 37,787,000 29,994,000  
Cash and cash equivalents 20,658,000 51,678,000 $ 49,805,000
Co-investment commitments 93,528,000 73,573,000  
Reportable segments | Private strategies      
Disclosure of detailed information about financial instruments [line items]      
Co-investment commitments $ 5,900,000 6,100,000  
Price risk      
Disclosure of detailed information about financial instruments [line items]      
Percentage change in unobservable input (percent) 5.00%    
Change in fair value measurement due to reasonably possible change in unobservable input, recognised in profit or loss $ 5,000,000 4,000,000  
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Current debt instruments held $ 0 0  
Foreign currency risk | US Dollars      
Disclosure of detailed information about financial instruments [line items]      
Percentage change in unobservable input (percent) 5.00%    
Change in fair value measurement due to reasonably possible change in unobservable input, recognised in profit or loss $ 4,900,000 3,900,000  
Assets 73,200,000 55,200,000  
Cash 9,700,000 12,900,000  
Accounts receivable 6,800,000 4,000,000  
Other assets 8,200,000 5,400,000  
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Maximum borrowing capacity under borrowing facilities 75,000,000    
Cash and cash equivalents $ 20,700,000 $ 51,700,000  
Liquidity risk | Cash and cash equivalents      
Disclosure of detailed information about financial instruments [line items]      
Proprietary investments, percentage 5.00% 13.00%  
Liquidity risk | Current investments      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 39,700,000 $ 32,000,000  
Proprietary investments, percentage 40.00% 40.00%