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Goodwill and intangible assets - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
cash_generating_unit
Dec. 31, 2022
USD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Number of cash-generating units | cash_generating_unit 5  
Goodwill $ 19,149 $ 19,149
Intangible assets 202,051 197,762
Goodwill impairment 0  
Managed equities    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill 1,200 1,200
Exchange listed products    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Goodwill 17,900 17,900
Fund management contracts (indefinite life)    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets $ 182,902 $ 178,613
Fund management contracts (indefinite life) | Discount Rate    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Measurement input, discount rate (percent) 0.0925