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Commitments and contingencies - Narrative (Details)
SFr in Thousands, $ in Millions
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CHF (SFr)
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Gross lease liabilities SFr 282,900   SFr 21,800
Bank guarantee | $   $ 133.0  
thereof restricted cash 129,500   0
Uncommitted Credit Facility      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Borrowing facilities, maximum borrowing capacity | $   $ 133.0  
Office leases      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Gross lease liabilities 254,900   18,200
Contingent liability for guarantees      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Estimated financial effect of contingent liabilities 126,100   2,900
Group cash pool participants      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Gross bank balances before cash pooling offset SFr 202,400   SFr 87,600