Financial result (Details) - CHF (SFr) SFr in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Analysis of income and expense [abstract]
Interest income	SFr 30.9	SFr 23.5	SFr 11.5
Financial income	30.9	23.5	11.5
Bank charges	(7.6)	(7.3)	(4.3)
Interest expenses: leases	(21.4)	(15.3)	(6.5)
Interest expenses: employee benefits	(0.5)	(0.5)	(0.5)
Financial expenses	(29.6)	(23.1)	(11.3)
Foreign exchange gain / (loss)	(173.2)	67.7	(111.4)
Foreign exchange gain / (loss)	(173.2)	67.7	(111.4)
Financial result	SFr (171.8)	SFr 68.1	SFr (111.1)

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The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Classes of financial instruments [domain]]

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The amount of income arising from interest.

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Financial Income Expense

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