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Commitments and contingencies - Schedule of Future Lease Commitments (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities SFr 282.9 SFr 21.8
Due in less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities 6.6 0.6
Due 1 - 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities 92.1 9.2
Due > 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities SFr 184.2 SFr 12.0