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Provisions - Narrative (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Provisions [Line Items]      
Other provisions SFr 36.6 SFr 17.1 SFr 12.1
Asset retirement obligation      
Disclosure of Provisions [Line Items]      
Other provisions SFr 5.9 SFr 4.5