v3.25.4
INVESTMENTS (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of associates [line items]      
Investments accounted for using equity method, beginning balance SFr 48.4    
Additions 0.0 SFr 0.6 SFr 0.0
Share of net results 5.9 1.3 (0.3)
Dividends (3.3) (3.0)  
Other (21.0) (3.0)  
Investments accounted for using equity method, ending balance 30.0 48.4  
Impairment loss on investment 20.2    
Unadjusted Difference      
Disclosure of associates [line items]      
Investments accounted for using equity method, beginning balance SFr 48.4 52.5  
Investments accounted for using equity method, ending balance   SFr 48.4 SFr 52.5