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Property, plant and equipment - Narrative (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]      
Additions SFr 65.1 SFr 42.8  
Noncash additions of property, plant and equipment 4.6 0.0  
Property, plant and equipment 127.2 93.6 SFr 77.2
Construction in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 7.3 2.4  
Leasehold improvements      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions 35.1 15.1  
Property, plant and equipment SFr 71.7 49.6 44.7
Leasehold improvements | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 3 years    
Leasehold improvements | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 8 years    
Trade tools      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions SFr 0.9 3.8  
Property, plant and equipment SFr 4.3 6.1 5.3
Useful life measured as period of time, property, plant and equipment 3 years    
Production equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions SFr 10.7 8.8  
Property, plant and equipment SFr 11.8 9.4 7.5
Useful life measured as period of time, property, plant and equipment 2 years    
Furniture and fixtures      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions SFr 11.2 7.4  
Property, plant and equipment SFr 24.1 16.5 12.1
Furniture and fixtures | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 5 years    
Furniture and fixtures | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 8 years    
Other      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions SFr 7.2 7.7  
Property, plant and equipment SFr 15.4 SFr 11.9 SFr 7.6
Other | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 3 years    
Other | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 8 years