Share-based compensation - Schedule of Expenses Arising from Share-based Payment Transactions (Details) - CHF (SFr) SFr in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||
| Expense from equity-settled share-based payment transactions | SFr 62.6 | SFr 71.5 | SFr 31.8 |
| Share-based compensation | 66.6 | 57.5 | 27.3 |
| LTIP 2021 | |||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||
| Expense from equity-settled share-based payment transactions | 61.5 | 51.9 | 24.4 |
| Other | |||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||
| Expense from equity-settled share-based payment transactions | SFr 1.0 | SFr 19.6 | SFr 7.4 |