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Employee benefit obligations - Plan Assets (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Employee benefit obligations at January 1 SFr (5.9) SFr (5.6)
Employee benefit obligations at December 31 (6.3) (5.9)
Plan assets    
Disclosure of defined benefit plans [line items]    
Employee benefit obligations at January 1 17.0 11.1
Contributions by the employer (1.8) 1.5
Contributions by the employees 2.2 1.5
Interest income 0.1 0.0
Benefits paid 0.9 2.1
Return on plan assets excl. interest income (1.1) 0.8
Employee benefit obligations at December 31 SFr 17.4 SFr 17.0