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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, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Expected credit loss at January 1 SFr (204.8)  
Expected credit loss at December 31 (246.2) SFr (204.8)
Expected credit loss    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Expected credit loss at January 1 13.3 9.1
Income statement (release) / addition for the year (2.7) 4.6
Exchange Difference 0.1 (0.4)
Expected credit loss at December 31 SFr 10.7 SFr 13.3