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Segment information (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Non-current assets SFr 509.2 SFr 441.7
Europe, Middle East and Africa    
Disclosure of operating segments [line items]    
Non-current assets 273.7 270.4
thereof Switzerland    
Disclosure of operating segments [line items]    
Non-current assets 194.1 242.6
Americas    
Disclosure of operating segments [line items]    
Non-current assets 196.6 144.3
thereof the United States    
Disclosure of operating segments [line items]    
Non-current assets 195.1 142.2
Asia-Pacific    
Disclosure of operating segments [line items]    
Non-current assets SFr 38.9 SFr 27.1