FINANCIAL INSTRUMENTS & RISK - Undrawn Borrowing Facilities (Details) - CHF (SFr) SFr in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Related party long-term payables | ||
| Borrowings | SFr 4,337.2 | SFr 4,676.8 |
| Sunrise Holding Revolving Facility | ||
| Related party long-term payables | ||
| Facility amount (in borrowing currency) | 500.0 | 685.8 |
| Ancillary Facility | ||
| Related party long-term payables | ||
| Facility amount (in borrowing currency) | 37.5 | 56.4 |
| Borrowings | SFr 14.3 | SFr 23.8 |