Segment information - Schedule of Operating Segments (Details) - CHF (SFr) SFr in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of operating segments [line items] | ||
| Non-current assets | SFr 697.1 | SFr 509.2 |
| Europe, Middle East and Africa | ||
| Disclosure of operating segments [line items] | ||
| Non-current assets | 319.6 | 273.7 |
| thereof Switzerland | ||
| Disclosure of operating segments [line items] | ||
| Non-current assets | 184.5 | 194.1 |
| Americas | ||
| Disclosure of operating segments [line items] | ||
| Non-current assets | 292.4 | 196.6 |
| thereof the United States | ||
| Disclosure of operating segments [line items] | ||
| Non-current assets | 289.4 | 195.1 |
| Asia-Pacific | ||
| Disclosure of operating segments [line items] | ||
| Non-current assets | SFr 85.0 | SFr 38.9 |