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Liquidity risk - Narrative (Details) - Dec. 31, 2022
SFr in Millions, $ in Millions
CHF (SFr)
USD ($)
Disclosure of detailed information about borrowings [line items]    
Current bank overdrafts SFr 3.1  
Bank overdraft facility one, CHF    
Disclosure of detailed information about borrowings [line items]    
Credit facility, maximum borrowing capacity 100.0  
Bank overdraft facility two, CHF    
Disclosure of detailed information about borrowings [line items]    
Credit facility, maximum borrowing capacity SFr 25.0  
Bank overdraft facility three, USD    
Disclosure of detailed information about borrowings [line items]    
Credit facility, maximum borrowing capacity | $   $ 35.0