EVENTS AFTER THE BALANCE SHEET DATE (Details) - CHF (SFr) SFr in Millions |
Dec. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|
| Disclosure of non-adjusting events after reporting period [line items] | |||
| Estimated restructuring provision to be recognised | SFr 2.9 | SFr 4.7 | |
| Restructuring obligations | |||
| Disclosure of non-adjusting events after reporting period [line items] | |||
| Estimated restructuring provision to be recognised | SFr 2.9 | SFr 4.7 | |
| Announcing or commencing implementation of major restructuring [member] | Restructuring obligations | Forecast | |||
| Disclosure of non-adjusting events after reporting period [line items] | |||
| Estimated restructuring provision to be recognised | SFr 26.0 |