v3.24.0.1
Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [abstract]  
Schedule of Property, Plant and Equipment
(CHF in millions)Leasehold improvementsTrade toolsProduction toolsFurniture and fixturesOtherTotal
Cost at January 1, 202220.9 7.3 11.9 3.2 4.5 47.9 
Accumulated Depreciation at January 1, 2022(1.9)(3.5)(5.6)(0.6)(1.9)(13.5)
Net book amount at January 1, 202219.0 3.8 6.3 2.6 2.6 34.4 
Twelve month period ended December 31, 2022
Opening net book amounts19.0 3.8 6.3 2.6 2.6 34.4 
Additions30.8 4.1 7.9 10.7 6.8 60.3 
Disposals(0.4)(0.1)(1.3)— — (1.8)
Depreciation(3.7)(2.4)(5.3)(0.9)(1.8)(14.1)
Currency translation(1.0)(0.1)0.0 (0.3)(0.1)(1.5)
Net book value at December 31, 202244.7 5.3 7.5 12.1 7.6 77.2 
Cost at December 31, 202249.7 10.7 12.9 13.5 11.0 97.8 
Accumulated Depreciation at December 31, 2022(5.0)(5.4)(5.3)(1.4)(3.4)(20.6)
Net book amount at December 31, 202244.7 5.3 7.5 12.1 7.6 77.2 
Twelve month period ended December 31, 2023
Opening net book amounts44.7 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)
Currency translation(2.5)(0.4)— (0.8)(0.3)(4.0)
Net book value at December 31, 202349.6 6.1 9.4 16.5 11.9 93.6 
Cost at December 31, 202361.2 13.6 21.7 19.9 18.1 134.5 
Accumulated Depreciation at December 31, 2023(11.6)(7.5)(12.3)(3.4)(6.2)(41.0)
Net book amount at December 31, 202349.6 6.1 9.4 16.5 11.9 93.6