EMPLOYEE BENEFIT OBLIGAITONS - Assets and Obligations (Details) - CHF (SFr) SFr in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Employee Benefit Obligations [Abstract] | ||
| Fair value of plan assets | SFr 876.0 | SFr 851.4 |
| Defined benefit obligation | (832.2) | (859.8) |
| Asset ceiling | (45.6) | 0.0 |
| Total | SFr (1.8) | SFr (8.4) |
| 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 | ||||||||||
- 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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| X | ||||||||||
- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Employee Benefit Obligations [Abstract] No definition available.
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- Definition Plan Assets, Asset Ceiling No definition available.
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