Financial risk management - Sensitivity Analysis to Reasonable Possible Change in Interest Rates (Details) - Interest rate risk - CHF (SFr) SFr in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| CHF Positions | |||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | |||
| Increase in interest rates | 0.50% | 0.50% | 0.50% |
| Decrease in interest rates | (0.50%) | (0.50%) | (0.50%) |
| Effect on result before tax if interest rates increase | SFr 348 | SFr 508 | SFr 674 |
| Effect on result before tax if interest rates decrease | SFr (348) | SFr (508) | SFr (674) |
| USD Positions | |||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | |||
| Increase in interest rates | 0.50% | 0.50% | 0.50% |
| Decrease in interest rates | (0.50%) | (0.50%) | (0.50%) |
| Effect on result before tax if interest rates increase | SFr 115 | SFr 224 | SFr 235 |
| Effect on result before tax if interest rates decrease | SFr (115) | SFr (224) | SFr (235) |