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Net cash and cash equivalents (Details)
€ in Millions, SFr in Millions, $ in Millions
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2019
CHF (SFr)
Subclassifications of assets, liabilities and equities [abstract]                
Current bank accounts SFr 309.7     SFr 419.5        
Digital wallets 12.5     5.8        
Fixed deposit 48.8     227.8        
Cash and cash equivalents 371.0 $ 184.6 € 9.2 653.1 $ 710.0 € 2.1    
Current bank overdrafts 0.0     0.0        
Net cash and cash equivalents 371.0     653.1     SFr 90.6 SFr 0.1
thereof restricted cash SFr 129.5     SFr 0.0