Employee benefit obligations - Narrative (Details) - CHF (SFr) SFr in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Disclosure of defined benefit plans [abstract] | ||
| Estimate of contributions expected to be paid to plan for next annual reporting period | SFr 9.4 | |
| Employee benefit expenses | SFr 5.8 | SFr 4.5 |
| Weighted average duration of defined benefit obligation | 14 years | 15 years 8 months 12 days |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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