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Net sales - Net Sales by geographic regions as previously reported (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
Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales     1,222.1
Europe | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales     354.3
thereof Switzerland      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales 38.7 46.0 51.5
thereof Switzerland | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales     51.5
North America | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales     738.5
Asia-Pacific      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales SFr 260.2 SFr 141.1 80.2
Asia-Pacific | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales     80.2
Rest of World | Previously reported      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net sales     SFr 49.1