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Employee benefit obligations - Net Employee Benefit Obligation (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [abstract]      
Present value of defined benefit obligation SFr (52.9) SFr (35.3)  
Fair value of plan assets 44.3 33.1  
Employee benefit obligations SFr (8.6) SFr (2.2) SFr (6.3)