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Related parties - Narrative (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [line items]      
Share-based compensation SFr 13.8 SFr 13.8 SFr 15.1
Non-executive directors      
Disclosure of transactions between related parties [line items]      
Share-based compensation SFr 1.2 SFr 1.1 SFr 0.5