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Employee benefit obligations - Present Value Defined Benefit Obligation (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Employee benefit obligations at January 1 SFr 2.2 SFr 6.3
Actuarial (losses)/gains from    
Employee benefit obligations at December 31 8.6 2.2
Present value of defined benefit obligation    
Disclosure of defined benefit plans [line items]    
Employee benefit obligations at January 1 35.3 23.7
Current service cost 5.3 3.8
Contributions by the employees 4.3 3.1
Interest expenses 0.5 0.5
Benefits paid 2.8 0.8
Actuarial (losses)/gains from    
changes in financial assumptions 2.5 3.6
changes in experience adjustments 2.1 (0.2)
Employee benefit obligations at December 31 SFr 52.9 SFr 35.3