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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2024
Intangible assets and goodwill [abstract]  
Schedule of Intangible Assets
(CHF in millions)Patents, licenses and other rightsSoftwareGoodwillTotal
Cost as of January 1, 202369.2 25.9 1.8 96.9 
Accumulated Amortization as of January 1, 2023(15.0)(11.6)— (26.6)
Net book value as of January 1, 202354.2 14.4 1.8 70.3 
Twelve month period ended December 31, 2023
Opening net book value
54.2 14.4 1.8 70.3 
Additions1.2 3.1 — 4.4 
Amortization(4.5)(5.5)— (10.1)
Exchange Difference— (0.1)— (0.1)
Net book value as of December 31, 202350.9 11.9 1.8 64.6 
Cost as of December 31, 202370.4 29.0 1.8 101.2 
Accumulated Amortization as of December 31, 2023(19.6)(17.1)— (36.6)
Net book value as of December 31, 202350.9 11.9 1.8 64.6 
Twelve month period ended December 31, 2024
Opening net book value
50.9 11.9 1.8 64.6 
Additions1.4 3.0 — 4.5 
Amortization(4.7)(6.0)— (10.8)
Net book value as of December 31, 202447.5 9.0 1.8 58.3 
Cost as of December 31, 202471.8 32.1 1.8 105.7 
Accumulated Amortization as of December 31, 2024(24.3)(23.1)— (47.4)
Net book value as of December 31, 202447.5 9.0 1.8 58.3