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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [abstract]  
Schedule of Property, Plant and Equipment
(CHF in millions)Leasehold improvementsTrade tools
Production equipment
Furniture and fixturesOtherTotal
Cost as of January 1, 202349.7 10.7 12.9 13.5 11.0 97.8 
Accumulated Depreciation as of January 1, 2023(5.0)(5.4)(5.3)(1.4)(3.4)(20.6)
Net book value as of January 1, 202344.7 5.3 7.5 12.1 7.6 77.2 
Twelve month period ended December 31, 2023
Opening net book value
44.7 5.3 7.5 12.1 7.6 77.2 
Additions15.1 3.8 8.8 7.4 7.7 42.8 
Disposals(0.3)— — (0.1)(0.1)(0.5)
Depreciation(7.4)(2.5)(7.0)(2.1)(2.9)(21.9)
Exchange difference(2.5)(0.4)— (0.8)(0.3)(4.0)
Net book value as of December 31, 202349.6 6.1 9.4 16.5 11.9 93.6 
Cost as of December 31, 202361.2 13.6 21.7 19.9 18.1 134.5 
Accumulated Depreciation as of December 31, 2023(11.6)(7.5)(12.3)(3.4)(6.2)(41.0)
Net book value as of December 31, 202349.6 6.1 9.4 16.5 11.9 93.6 
Twelve month period ended December 31, 2024
Opening net book value49.6 6.1 9.4 16.5 11.9 93.6 
Additions35.1 0.9 10.7 11.2 7.2 65.1 
Disposals(0.5)— — (0.2)(0.1)(0.7)
Depreciation(14.1)(2.9)(8.4)(4.0)(3.6)(33.1)
Exchange difference1.5 0.2 — 0.6 — 2.3 
Net book value as of December 31, 202471.7 4.3 11.8 24.1 15.4 127.2 
Cost as of December 31, 202497.3 14.9 32.4 31.5 25.0 201.2 
Accumulated Depreciation as of December 31, 2024(25.7)(10.6)(20.7)(7.4)(9.6)(74.0)
Net book value as of December 31, 202471.7 4.3 11.8 24.1 15.4 127.2