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Commitments and contingencies - Schedule of Future Lease Commitments (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities SFr 331.1 SFr 385.7
Due in less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities 16.9 15.8
Due 1 - 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities 135.8 145.4
Due > 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Gross lease liabilities SFr 178.5 SFr 224.5