Employee benefit obligations - Schedule of Reconciliation of Employee Benefit Obligation (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] | ||
| Employee benefit obligations at January 1 | SFr (8.6) | SFr (2.2) |
| Amounts recognized in income statement | (8.3) | (5.3) |
| Amounts recognized in other comprehensive income | 7.2 | (1.2) |
| Contributions by the employer | 4.3 | 0.2 |
| Employee benefit obligations at December 31 | SFr (5.5) | SFr (8.6) |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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 Decrease (Increase) in Net Defined Benefit Liability Resulting From Resulting From Contributions (Unpaid Contributions) To Plan By Employer No definition available.
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