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Right-of-use assets and lease liabilities - Narrative (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Additions SFr 153.8 SFr 103.4
Lease modification 6.4 2.0
Storage    
Disclosure of quantitative information about right-of-use assets [line items]    
Additions 57.4 66.0
Lease modification 0.1 (2.1)
Stores & showrooms    
Disclosure of quantitative information about right-of-use assets [line items]    
Additions 76.2 27.1
Lease modification SFr 4.4 SFr 3.3