Related parties - Narrative (Details) - CHF (SFr) SFr in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of transactions between related parties [line items] | |||
| Share-based compensation | SFr 12.7 | SFr 13.8 | SFr 13.8 |
| Non-executive directors | |||
| Disclosure of transactions between related parties [line items] | |||
| Share-based compensation | SFr 1.2 | SFr 1.2 | SFr 1.1 |