v3.26.1
Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period SFr 148.8 SFr 127.2
Additions 46.5 25.5
Disposals (0.1) (0.2)
Depreciation (22.0) (18.7)
Currency Translation 2.3 (6.6)
Property, plant and equipment at the end of period 175.5 127.2
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 81.7 71.7
Additions 22.6 12.2
Disposals (0.1) (0.1)
Depreciation (10.5) (8.8)
Currency Translation 1.0 (4.4)
Property, plant and equipment at the end of period 94.8 70.6
Trade tools    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 2.3 4.3
Additions 0.0 0.2
Disposals 0.0 0.0
Depreciation (0.6) (1.1)
Currency Translation 0.0 (0.3)
Property, plant and equipment at the end of period 1.8 3.1
Production equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 25.7 11.8
Additions 13.8 2.9
Disposals 0.0 0.0
Depreciation (6.5) (4.5)
Currency Translation 0.6 0.0
Property, plant and equipment at the end of period 33.6 10.2
Furniture and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 24.5 24.1
Additions 8.4 1.5
Disposals 0.0 (0.1)
Depreciation (2.5) (2.2)
Currency Translation 0.4 (1.4)
Property, plant and equipment at the end of period 30.7 21.9
Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 14.6 15.4
Additions 1.7 8.6
Disposals 0.0 0.0
Depreciation (1.9) (1.9)
Currency Translation 0.3 (0.5)
Property, plant and equipment at the end of period 14.6 21.5
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 251.6 201.2
Property, plant and equipment at the end of period 302.4 216.5
Cost | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 124.0 97.3
Property, plant and equipment at the end of period 148.4 103.4
Cost | Trade tools    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 11.3 14.9
Property, plant and equipment at the end of period 11.5 14.1
Cost | Production equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 53.3 32.4
Property, plant and equipment at the end of period 68.4 35.4
Cost | Furniture and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 35.7 31.5
Property, plant and equipment at the end of period 44.5 31.0
Cost | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 27.3 25.0
Property, plant and equipment at the end of period 29.5 32.7
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (102.8) (74.0)
Property, plant and equipment at the end of period (126.8) (89.3)
Accumulated depreciation | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (42.3) (25.7)
Property, plant and equipment at the end of period (53.7) (32.8)
Accumulated depreciation | Trade tools    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (9.0) (10.6)
Property, plant and equipment at the end of period (9.7) (11.1)
Accumulated depreciation | Production equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (27.7) (20.7)
Property, plant and equipment at the end of period (34.8) (25.2)
Accumulated depreciation | Furniture and fixtures    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (11.2) (7.4)
Property, plant and equipment at the end of period (13.8) (9.1)
Accumulated depreciation | Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (12.7) (9.6)
Property, plant and equipment at the end of period SFr (14.9) SFr (11.1)