v3.25.4
PROVISIONS (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in other provisions [abstract]    
Other provisions at beginning of period SFr 68.7 SFr 116.9
Provisions made during the period 11.0 4.0
Change in present value 1.3 2.4
Provisions used during the period (10.8) (54.6)
Other provisions at end of period 70.2 68.7
Thereof current 2.9 4.7
Thereof non-current SFr 67.3 64.0
Provisions, expected term 12 months  
Asset Retirement Obligations    
Reconciliation of changes in other provisions [abstract]    
Other provisions at beginning of period SFr 64.0 64.1
Provisions made during the period 2.4 2.1
Change in present value 1.3 2.4
Provisions used during the period (0.4) (4.6)
Other provisions at end of period 67.3 64.0
Thereof current 0.0 0.0
Thereof non-current 67.3 64.0
Restructuring Obligations    
Reconciliation of changes in other provisions [abstract]    
Other provisions at beginning of period 4.7 22.9
Provisions made during the period 8.6 1.9
Change in present value 0.0 0.0
Provisions used during the period (10.4) (20.1)
Other provisions at end of period 2.9 4.7
Thereof current 2.9 4.7
Thereof non-current 0.0 0.0
Other Provisions    
Reconciliation of changes in other provisions [abstract]    
Other provisions at beginning of period 0.0 29.9
Provisions made during the period 0.0 0.0
Change in present value 0.0 0.0
Provisions used during the period 0.0 (29.9)
Other provisions at end of period 0.0 0.0
Thereof current 0.0 0.0
Thereof non-current SFr 0.0 SFr 0.0