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Property, plant and equipment - Schedule of Property, Plant and Equipment (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period SFr 93.6 SFr 77.2
Additions 30.5 19.0
Disposals   (0.3)
Depreciation (14.4) (10.1)
Currency Translation 2.1 (1.5)
Property, plant and equipment at the end of period 111.7 84.3
Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 49.6 44.7
Additions 17.4 8.4
Disposals   (0.2)
Depreciation (5.7) (3.4)
Currency Translation 1.3 (1.0)
Property, plant and equipment at the end of period 62.5 48.6
Trade tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 6.1 5.3
Additions 0.4 0.5
Disposals   0.0
Depreciation (1.5) (1.2)
Currency Translation 0.2 (0.1)
Property, plant and equipment at the end of period 5.3 4.5
Production equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 9.4 7.5
Additions 5.4 4.1
Disposals   0.0
Depreciation (4.3) (3.2)
Currency Translation 0.0 0.0
Property, plant and equipment at the end of period 10.6 8.5
Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 16.5 12.1
Additions 3.8 3.7
Disposals   0.0
Depreciation (1.4) (0.9)
Currency Translation 0.5 (0.3)
Property, plant and equipment at the end of period 19.4 14.6
Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 11.9 7.6
Additions 3.5 2.1
Disposals   0.0
Depreciation (1.5) (1.4)
Currency Translation 0.2 (0.1)
Property, plant and equipment at the end of period 14.0 8.2
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 134.5 97.8
Property, plant and equipment at the end of period 167.6 114.3
Cost | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 61.2 49.7
Property, plant and equipment at the end of period 80.1 56.6
Cost | Trade tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 13.6 10.7
Property, plant and equipment at the end of period 14.4 10.9
Cost | Production equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 21.7 12.9
Property, plant and equipment at the end of period 27.1 17.0
Cost | Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 19.9 13.5
Property, plant and equipment at the end of period 24.3 16.9
Cost | Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period 18.1 11.0
Property, plant and equipment at the end of period 21.8 12.9
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (41.0) (20.6)
Property, plant and equipment at the end of period (55.9) (30.0)
Accumulated depreciation | Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (11.6) (5.0)
Property, plant and equipment at the end of period (17.6) (8.0)
Accumulated depreciation | Trade tools    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (7.5) (5.4)
Property, plant and equipment at the end of period (9.1) (6.4)
Accumulated depreciation | Production equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (12.3) (5.3)
Property, plant and equipment at the end of period (16.5) (8.5)
Accumulated depreciation | Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (3.4) (1.4)
Property, plant and equipment at the end of period (4.9) (2.3)
Accumulated depreciation | Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment at beginning of period (6.2) (3.4)
Property, plant and equipment at the end of period SFr (7.8) SFr (4.8)