Right-of-use assets and lease liabilities - Schedule of Lease Liabilities (Details) - CHF (SFr) SFr in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of quantitative information about right-of-use assets [line items] | ||
| Lease liability balance at January 1, | SFr 347.5 | SFr 228.9 |
| thereof current | 59.1 | 38.7 |
| thereof non-current | 288.5 | 190.3 |
| Payments | (65.9) | (51.3) |
| Interest expenses paid | (21.3) | (15.2) |
| Disposals | (0.1) | (0.2) |
| Additions | 281.4 | 153.7 |
| Lease modification | 6.0 | 5.4 |
| Accrued interest | 21.3 | 15.2 |
| Exchange differences | (47.4) | 10.9 |
| Lease liability balance at December 31, | 521.5 | 347.5 |
| thereof current | 59.1 | 38.7 |
| thereof non-current | SFr 288.5 | SFr 190.3 |