Employee benefit obligations - Schedule of Net Employee Benefit Obligation (Details) - CHF (SFr) SFr in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of defined benefit plans [abstract] | |||
| Present value of defined benefit obligation | SFr (65.4) | SFr (52.9) | |
| Fair value of plan assets | 59.9 | 44.3 | |
| Employee benefit obligations | SFr (5.5) | SFr (8.6) | SFr (2.2) |
| X | ||||||||||
- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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