Commitments and contingencies - Schedule of Future Lease Commitments (Details) - CHF (SFr) SFr in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Commitments for future lease obligations | SFr 153.8 | SFr 331.1 |
| Due in less than 1 year | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Commitments for future lease obligations | 7.8 | 16.9 |
| Due 1 - 5 years | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Commitments for future lease obligations | 67.7 | 135.8 |
| Due > 5 years | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Commitments for future lease obligations | SFr 78.3 | SFr 178.5 |