v3.24.0.1
Employee benefit obligations - Net Employee Benefit Obligation (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [abstract]      
Present value of defined benefit obligation SFr (35.3) SFr (23.7)  
Fair value of plan assets 33.1 17.4  
Employee benefit obligations SFr (2.2) SFr (6.3) SFr (5.9)