v3.25.4
BORROWINGS - SPE Notes (Details)
€ in Millions, SFr in Millions, $ in Millions
Dec. 31, 2025
CHF (SFr)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
CHF (SFr)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Disclosure of detailed information about borrowings [line items]            
Borrowings SFr 4,337.2     SFr 4,676.8    
Principal amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings 4,345.7     4,687.1    
Sunrise holding SPE notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 2,141.3     1,467.2    
Sunrise holding SPE notes | Principal amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings SFr 2,143.3     SFr 1,468.8    
2031 Sunrise holding senior secured notes            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.88% 4.88% 4.88% 4.88% 4.88% 4.88%
Original issue amount | $   $ 1,250.0     $ 1,250.0  
Borrowings SFr 975.5     SFr 1,115.9    
2031 Sunrise holding senior secured notes | Principal amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings SFr 975.9 $ 1,230.0   SFr 1,116.6 $ 1,230.0  
UPCB finance VII euro notes            
Disclosure of detailed information about borrowings [line items]            
Interest rate 3.63% 3.63% 3.63% 3.63% 3.63% 3.63%
Original issue amount | €     € 600.0     € 600.0
Borrowings SFr 295.8     SFr 351.3    
UPCB finance VII euro notes | Principal amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings SFr 296.3   € 318.1 SFr 352.2   € 374.9
Sunrise FinCo I B.V. 4.625% 2032            
Disclosure of detailed information about borrowings [line items]            
Borrowings, adjustment to interest rate basis 4.625% 4.625% 4.625%      
Interest rate 4.63% 4.63% 4.63%      
Original issue amount | €     € 935.0      
Borrowings SFr 870.0          
Sunrise FinCo I B.V. 4.625% 2032 | Principal amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings SFr 871.1   € 935.0