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Trade receivables - Schedule of Trade Receivables (Details) - Trade receivables - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets SFr 246.2 SFr 204.8  
Gross Carrying Amount      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 257.0 218.1  
Gross Carrying Amount | Not yet due      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 182.2 158.8  
Gross Carrying Amount | Past due 1 - 90 days      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 58.5 42.2  
Gross Carrying Amount | Past due 91 - 180 days      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 5.4 8.0  
Gross Carrying Amount | Past due > 181 days      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets 10.8 9.1  
Expected credit loss      
Disclosure of financial assets that are either past due or impaired [line items]      
Financial assets SFr (10.7) SFr (13.3) SFr (9.1)