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Share-based compensation - Schedule of Expenses Arising from Share-based Payment Transactions (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from equity-settled share-based payment transactions SFr 71.5 SFr 31.8 SFr 33.8
Share-based compensation 57.5 27.3 38.3
LTIP 2021      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from equity-settled share-based payment transactions 51.9 24.4 0.0
LTIP 2020      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from equity-settled share-based payment transactions 0.0 0.0 32.7
Other      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from equity-settled share-based payment transactions SFr 19.6 SFr 7.4 SFr 1.1