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PERSONNEL EXPENSES (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Personnel Expenses [Abstract]      
Wages, salaries and social security charges SFr 354.8 SFr 363.9 SFr 384.2
Pension costs 26.1 24.0 10.0
Share-based compensation 49.0 19.1 22.5
Total SFr 429.9 SFr 407.0 SFr 416.7