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Employee benefit obligations - Employee Benefit Expense (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [abstract]      
Current service cost SFr (5.3) SFr (3.8) SFr (3.4)
Past service cost 0.0 0.0 0.3
Employee benefit expenses SFr (5.3) SFr (3.8) SFr (3.1)