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Segment information (Details)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
CHF (SFr)
co-founder
Reporting_Segment
numberOfCo-ceo
Dec. 31, 2021
CHF (SFr)
Disclosure of operating segments [line items]    
Number of Co-Founders | co-founder 3  
Number of Co-CEOs | numberOfCo-ceo 2  
Number of reporting segments | Reporting_Segment 1  
Non-current assets SFr 330.9 SFr 271.9
Europe    
Disclosure of operating segments [line items]    
Non-current assets 246.8 176.2
thereof Switzerland    
Disclosure of operating segments [line items]    
Non-current assets 222.0 168.9
North America    
Disclosure of operating segments [line items]    
Non-current assets 58.7 82.4
Asia-Pacific    
Disclosure of operating segments [line items]    
Non-current assets 24.1 12.3
Rest of World    
Disclosure of operating segments [line items]    
Non-current assets SFr 1.3 SFr 1.0