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Employee benefit obligations - Net Employee 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 [abstract]      
Present value of defined benefit obligation SFr (23.7) SFr (22.8)  
Fair value of plan assets 17.4 17.0  
Employee benefit obligations SFr (6.3) SFr (5.9) SFr (5.6)
Weighted average duration of defined benefit obligation 12 years 10 months 24 days 18 years 1 month 6 days