Commitments and contingencies - Schedule of Future Lease Commitments (Details) - CHF (SFr) SFr in Millions |
Jun. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | SFr 318.0 | SFr 385.7 |
| Due within 1 year | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 10.6 | 15.8 |
| Due 1 to 5 years | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | 121.4 | 145.4 |
| Due > 5 years | ||
| Disclosure of maturity analysis for non-derivative financial liabilities [line items] | ||
| Gross lease liabilities | SFr 186.0 | SFr 224.5 |