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Trade receivables - Schedule of Allowance for Credit Losses (Details) - Trade receivables - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Individual loss allowance    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Beginning balance SFr 2.0 SFr 1.8
Addition 6.3 1.5
Release (0.0) (1.3)
Exchange differences (0.1) 0.0
Ending balance 8.2 2.0
Expected credit loss    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Beginning balance 0.6 0.1
Change 0.3 0.5
Ending balance SFr 0.9 SFr 0.6