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Income taxes - Major Components of Income Tax (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Abstract]      
Current income taxes SFr 38.7 SFr 7.1 SFr 4.1
Deferred income taxes (18.6) 3.6 (1.0)
Income taxes SFr 20.2 SFr 10.6 SFr 3.1