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Employee benefit obligations - Employee Benefit Expense (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [abstract]      
Current service cost SFr (3.4) SFr (2.6) SFr (1.6)
Past service cost 0.3 0.0 0.0
Employee benefit expenses SFr (3.1) SFr (2.6) SFr (1.6)