v3.25.4
FINANCIAL INCOME AND EXPENSES - Schedule of Finance Income and Cost (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Finance income:      
Interest income SFr 3.5 SFr 8.1 SFr 3.0
Dividend income 0.0 0.0 0.0
Realised and unrealised gains on derivative instruments 0.0 249.6 0.0
Foreign currency transaction gains 420.2 0.0 568.6
Gains due to changes in fair values of certain investments and debt, net 0.0 0.0 3.1
Other financial income 2.1 0.0 0.0
Total 425.8 257.7 574.7
Finance expenses:      
Interest expense (313.3) (432.9) (431.1)
Realised and unrealised losses on derivative instruments (290.1) 0.0 (524.5)
Foreign currency transaction losses 0.0 (295.2) 0.0
Losses on debt modification and extinguishment (29.2) (4.0) (0.1)
Losses due to changes in fair values of certain investments and debt, net (21.0) (6.1) 0.0
Other financial expense (2.7) (4.4) (1.5)
Total SFr (656.3) SFr (742.6) SFr (957.2)