v3.25.4
Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period SFr 127.2 SFr 93.6
Additions 69.2 65.1
Disposals (1.2) (0.7)
Impairment (0.8)  
Depreciation (38.2) (33.1)
Exchange difference (7.4) 2.3
Property, plant and equipment at the end of period 148.8 127.2
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 71.7 49.6
Additions 34.2 35.1
Disposals (0.3) (0.5)
Impairment (0.5)  
Depreciation (18.3) (14.1)
Exchange difference (5.0) 1.5
Property, plant and equipment at the end of period 81.7 71.7
Trade tools    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 4.3 6.1
Additions 0.6 0.9
Disposals (0.4) 0.0
Impairment 0.0  
Depreciation (1.9) (2.9)
Exchange difference (0.3) 0.2
Property, plant and equipment at the end of period 2.3 4.3
Production equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 11.8 9.4
Additions 24.1 10.7
Disposals (0.1) 0.0
Impairment 0.0  
Depreciation (10.1) (8.4)
Exchange difference 0.0 0.0
Property, plant and equipment at the end of period 25.7 11.8
Furniture and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 24.1 16.5
Additions 6.8 11.2
Disposals (0.4) (0.2)
Impairment (0.2)  
Depreciation (4.3) (4.0)
Exchange difference (1.6) 0.6
Property, plant and equipment at the end of period 24.5 24.1
Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 15.4 11.9
Additions 3.5 7.2
Disposals (0.1) (0.1)
Impairment 0.0  
Depreciation (3.7) (3.6)
Exchange difference (0.5) 0.0
Property, plant and equipment at the end of period 14.6 15.4
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 201.2 134.5
Property, plant and equipment at the end of period 251.6 201.2
Cost | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 97.3 61.2
Property, plant and equipment at the end of period 124.0 97.3
Cost | Trade tools    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 14.9 13.6
Property, plant and equipment at the end of period 11.3 14.9
Cost | Production equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 32.4 21.7
Property, plant and equipment at the end of period 53.3 32.4
Cost | Furniture and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 31.5 19.9
Property, plant and equipment at the end of period 35.7 31.5
Cost | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 25.0 18.1
Property, plant and equipment at the end of period 27.3 25.0
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (74.0) (41.0)
Property, plant and equipment at the end of period (102.8) (74.0)
Accumulated depreciation | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (25.7) (11.6)
Property, plant and equipment at the end of period (42.3) (25.7)
Accumulated depreciation | Trade tools    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (10.6) (7.5)
Property, plant and equipment at the end of period (9.0) (10.6)
Accumulated depreciation | Production equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (20.7) (12.3)
Property, plant and equipment at the end of period (27.7) (20.7)
Accumulated depreciation | Furniture and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (7.4) (3.4)
Property, plant and equipment at the end of period (11.2) (7.4)
Accumulated depreciation | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (9.6) (6.2)
Property, plant and equipment at the end of period SFr (12.7) SFr (9.6)