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Income taxes - Major Components of Income Tax (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]      
Current income taxes SFr 35.7 SFr 38.7 SFr 7.1
Deferred income taxes (46.2) (18.6) 3.6
Income tax expense (benefit) SFr (10.5) SFr 20.2 SFr 10.6