v3.24.0.1
Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period SFr 77.2 SFr 34.4
Additions 42.8 60.3
Disposals (0.5) (1.8)
Depreciation (21.9) (14.1)
Currency translation (4.0) (1.5)
Property, plant and equipment at the end of period 93.6 77.2
Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 44.7 19.0
Additions 15.1 30.8
Disposals (0.3) (0.4)
Depreciation (7.4) (3.7)
Currency translation (2.5) (1.0)
Property, plant and equipment at the end of period 49.6 44.7
Trade tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 5.3 3.8
Additions 3.8 4.1
Disposals 0.0 (0.1)
Depreciation (2.5) (2.4)
Currency translation (0.4) (0.1)
Property, plant and equipment at the end of period SFr 6.1 5.3
Useful life measured as period of time, property, plant and equipment 3 years  
Production tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period SFr 7.5 6.3
Additions 8.8 7.9
Disposals 0.0 (1.3)
Depreciation (7.0) (5.3)
Currency translation 0.0 0.0
Property, plant and equipment at the end of period SFr 9.4 7.5
Useful life measured as period of time, property, plant and equipment 2 years  
Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period SFr 12.1 2.6
Additions 7.4 10.7
Disposals (0.1) 0.0
Depreciation (2.1) (0.9)
Currency translation (0.8) (0.3)
Property, plant and equipment at the end of period 16.5 12.1
Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 7.6 2.6
Additions 7.7 6.8
Disposals (0.1) 0.0
Depreciation (2.9) (1.8)
Currency translation (0.3) (0.1)
Property, plant and equipment at the end of period 11.9 7.6
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 97.8 47.9
Property, plant and equipment at the end of period 134.5 97.8
Cost | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 49.7 20.9
Property, plant and equipment at the end of period 61.2 49.7
Cost | Trade tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 10.7 7.3
Property, plant and equipment at the end of period 13.6 10.7
Cost | Production tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 12.9 11.9
Property, plant and equipment at the end of period 21.7 12.9
Cost | Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 13.5 3.2
Property, plant and equipment at the end of period 19.9 13.5
Cost | Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 11.0 4.5
Property, plant and equipment at the end of period 18.1 11.0
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (20.6) (13.5)
Property, plant and equipment at the end of period (41.0) (20.6)
Accumulated depreciation | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (5.0) (1.9)
Property, plant and equipment at the end of period (11.6) (5.0)
Accumulated depreciation | Trade tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (5.4) (3.5)
Property, plant and equipment at the end of period (7.5) (5.4)
Accumulated depreciation | Production tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (5.3) (5.6)
Property, plant and equipment at the end of period (12.3) (5.3)
Accumulated depreciation | Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (1.4) (0.6)
Property, plant and equipment at the end of period (3.4) (1.4)
Accumulated depreciation | Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (3.4) (1.9)
Property, plant and equipment at the end of period SFr (6.2) SFr (3.4)