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Liquidity risk - Narrative (Details) - Bank overdraft facility four, CHF - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Jul. 07, 2023
Disclosure of detailed information about borrowings [line items]      
Credit facility, maximum borrowing capacity     SFr 700.0
Line of credit facility option to increase amount     SFr 200.0
Initial term of facility agreement     3 years
Credit facility extension period 1 year   1 year
Bank guarantee SFr 168.3 SFr 155.3