v3.24.0.1
Trade receivables - Schedule of Trade Receivables (Details) - Trade receivables - CHF (SFr)
SFr in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets SFr 204.8 SFr 174.6
Gross carrying amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 218.1 183.7
Gross carrying amount | Not yet due    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 158.8 112.3
Gross carrying amount | Past due 1 - 90 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 42.2 47.3
Gross carrying amount | Past due 91 - 180 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 8.0 14.8
Gross carrying amount | Past due 181 - 360 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 6.7 7.3
Gross carrying amount | Past due > 361 days    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2.4 2.0
Allowances    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (13.3) (9.1)
Individual loss allowance    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12.6 8.2
Expected credit loss    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets SFr 0.7 SFr 0.9