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Right-of-use assets and lease liabilities - Schedule of Lease Liabilities (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]      
Lease liability balance at January 1, SFr 228.9 SFr 160.5  
thereof current 38.7 21.6  
thereof non-current 190.3 138.8  
Payments (51.3) (25.5) SFr (15.4)
Interest expenses paid (15.2) (6.4)  
Disposals (0.2) (0.3)  
Additions 153.7 103.0  
Lease modification 5.4 1.7  
Accrued interest 15.2 6.4  
Exchange differences 10.9 (10.6)  
Lease liability balance at December 31, 347.5 228.9 SFr 160.5
thereof current 38.7 21.6  
thereof non-current SFr 190.3 138.8  
Amount including rounding difference      
Disclosure of quantitative information about right-of-use assets [line items]      
Payments   SFr (25.4)