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Employee benefit obligations - Present Value Defined Benefit Obligation (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Employee benefit obligations at January 1 SFr (5.9) SFr (5.6)  
Actuarial losses/(gains) from      
changes in demographic assumptions 0.0 1.8 SFr 0.0
Employee benefit obligations at December 31 (6.3) (5.9) (5.6)
Present value of defined benefit obligation      
Disclosure of defined benefit plans [line items]      
Employee benefit obligations at January 1 (22.8) (16.8)  
Current service cost 3.4 2.6  
Contributions by the employees 2.2 1.5  
Interest expenses 0.1 0.0  
Past service cost (0.3) 0.0  
Benefits paid 0.9 2.1  
Actuarial losses/(gains) from      
changes in demographic assumptions 0.0 (1.8)  
changes in financial assumptions (6.8) (0.6)  
changes in experience adjustments 1.3 2.3  
Employee benefit obligations at December 31 SFr (23.7) SFr (22.8) SFr (16.8)