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Other current operating assets (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2022
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]    
Prepaid expenses SFr 21.0 SFr 16.5
Indirect taxes (VAT/GST) receivables 39.7 26.9
Social security receivables 9.3 0.2
Other current assets 7.0 4.4
Other current operating assets SFr 77.0 SFr 48.0