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Intangible assets - Narrative (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 58.3 SFr 64.6 SFr 70.3
Research and development expense 9.6 8.9  
Impairment loss recognised in profit or loss, goodwill 0.0 0.0  
Goodwill expected to be deductible for tax purposes 0.0    
Intangible assets under development      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 0.4 0.3  
Patents, licenses and other rights      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 47.5 50.9 54.2
Patents, licenses and other rights | Minimum      
Disclosure of detailed information about intangible assets [line items]      
Useful life measured as period of time, intangible assets other than goodwill 4 years    
Patents, licenses and other rights | Maximum      
Disclosure of detailed information about intangible assets [line items]      
Useful life measured as period of time, intangible assets other than goodwill 20 years    
Software      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 9.0 SFr 11.9 SFr 14.4
Useful life measured as period of time, intangible assets other than goodwill 4 years    
IT development cost capitalized      
Disclosure of detailed information about intangible assets [line items]      
Useful life measured as period of time, intangible assets other than goodwill 4 years    
Service, license, and investment agreement (SLIA) 2019      
Disclosure of detailed information about intangible assets [line items]      
Discount rate applied to cash flow projections 9.30%