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Intangible assets -Schedule of Intangible Assets (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period SFr 57.5 SFr 54.7
Additions 22.7 11.6
Disposals (0.5)  
Amortization (9.3) (8.8)
Intangible assets and goodwill at end of the period 70.3 57.5
Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 76.0 64.4
Intangible assets and goodwill at end of the period 96.9 76.0
Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period (18.5) (9.7)
Intangible assets and goodwill at end of the period (26.6) (18.5)
Patents, licenses and other rights    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 41.9 44.7
Additions 16.4 1.0
Disposals 0.0  
Amortization (4.1) (3.9)
Intangible assets and goodwill at end of the period 54.2 41.9
Patents, licenses and other rights | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 52.8 51.8
Intangible assets and goodwill at end of the period 69.2 52.8
Patents, licenses and other rights | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period (10.9) (7.0)
Intangible assets and goodwill at end of the period (15.0) (10.9)
Software    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 13.8 8.2
Additions 6.3 10.6
Disposals (0.5)  
Amortization (5.2) (4.9)
Intangible assets and goodwill at end of the period 14.4 13.8
Software | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 21.4 10.8
Intangible assets and goodwill at end of the period 25.9 21.4
Software | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period (7.6) (2.7)
Intangible assets and goodwill at end of the period (11.6) (7.6)
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 1.8 1.8
Additions 0.0 0.0
Disposals 0.0  
Amortization 0.0 0.0
Intangible assets and goodwill at end of the period 1.8 1.8
Goodwill | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 1.8 1.8
Intangible assets and goodwill at end of the period 1.8 1.8
Goodwill | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill at beginning of period 0.0 0.0
Intangible assets and goodwill at end of the period SFr 0.0 SFr 0.0