v3.25.4
EARNINGS PER SHARE - Schedule of Earnings per Share (Details) - CHF (SFr)
SFr / shares in Units, SFr in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Class A Common Shares      
Earnings per share [line items]      
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) SFr (108.2) SFr (352.7)  
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) SFr (108.2) SFr (352.7)  
Weighted average number of shares outstanding, basic (in shares) 69,486,095 69,619,207  
Weighted average number of shares outstanding, diluted (in shares) 69,486,095 69,619,207  
Adjusted weighted average of shares outstanding, basic (in shares) 69,486,095 69,619,207  
Adjusted weighted average of shares outstanding, diluted (in shares) 69,486,095 69,619,207  
Basic earnings (loss) per share (in SFr per share) SFr (1.6) SFr (5.1) SFr (4.4)
Diluted earnings (loss) per share (in SFr per share) SFr (1.6) SFr (5.1) (4.4)
Class B Common Shares      
Earnings per share [line items]      
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) SFr (4.0) SFr (13.1)  
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) SFr (4.0) SFr (13.1)  
Weighted average number of shares outstanding, basic (in shares) 25,862,650 25,977,316  
Weighted average number of shares outstanding, diluted (in shares) 25,862,650 25,977,316  
Adjusted weighted average of shares outstanding, basic (in shares) 25,862,650 25,977,316  
Adjusted weighted average of shares outstanding, diluted (in shares) 25,862,650 25,977,316  
Basic earnings (loss) per share (in SFr per share) SFr (0.2) SFr (0.5) (0.4)
Diluted earnings (loss) per share (in SFr per share) SFr (0.2) SFr (0.5) SFr (0.4)