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Net sales - Additional Information (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales SFr 2,318.3 SFr 1,792.1 SFr 1,222.1
Rest of World | Revision of prior period, reclassification, adjustment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   49.1  
Europe, Middle East and Africa      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 577.8 488.7 378.1
Europe, Middle East and Africa | Revision of prior period, reclassification, adjustment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   23.8  
Americas      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales SFr 1,480.3 1,162.2 SFr 763.8
Americas | Revision of prior period, reclassification, adjustment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales   SFr 25.3