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Related parties - Narrative (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Share-based compensation SFr 15.1 SFr 67.3 SFr 10.0
Non-executive directors      
Disclosure of transactions between related parties [line items]      
Share-based compensation SFr 0.5 SFr 0.3 SFr 0.1