v3.26.1
Property, plant and equipment (Tables)
 6 Months Ended
Jun. 30, 2026
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 at January 1, 202597.3 14.9 32.4 31.5 25.0 201.2 
Accumulated Depreciation at January 1, 2025(25.7)(10.6)(20.7)(7.4)(9.6)(74.0)
Net book value at January 1, 202571.7 4.3 11.8 24.1 15.4 127.2 
Six month period ended June 30, 2025
Opening net book value71.7 4.3 11.8 24.1 15.4 127.2 
Additions12.2 0.2 2.9 1.5 8.6 25.5 
Disposals(0.1)— — (0.1)— (0.2)
Depreciation(8.8)(1.1)(4.5)(2.2)(1.9)(18.7)
Currency Translation(4.4)(0.3)— (1.4)(0.5)(6.6)
Net book value at June 30, 202570.6 3.1 10.2 21.9 21.5 127.2 
Cost at June 30, 2025103.4 14.1 35.4 31.0 32.7 216.5 
Accumulated Depreciation at June 30, 2025(32.8)(11.1)(25.2)(9.1)(11.1)(89.3)
Net book value at June 30, 202570.6 3.1 10.2 21.9 21.5 127.2 
Cost at January 1, 2026124.0 11.3 53.3 35.7 27.3 251.6 
Accumulated Depreciation at January 1, 2026(42.3)(9.0)(27.7)(11.2)(12.7)(102.8)
Net book value at January 1, 202681.7 2.3 25.7 24.5 14.6 148.8 
Six month period ended June 30, 2026
Opening net book value81.7 2.3 25.7 24.5 14.6 148.8 
Additions22.6 — 13.8 8.4 1.7 46.5 
Disposals(0.1)— — — — (0.1)
Depreciation(10.5)(0.6)(6.5)(2.5)(1.9)(22.0)
Currency Translation1.0 — 0.6 0.4 0.3 2.3 
Net book value at June 30, 202694.8 1.8 33.6 30.7 14.6 175.5 
Cost at June 30, 2026148.4 11.5 68.4 44.5 29.5 302.4 
Accumulated Depreciation at June 30, 2026(53.7)(9.7)(34.8)(13.8)(14.9)(126.8)
Net book value at June 30, 202694.8 1.8 33.6 30.7 14.6 175.5