Financial result (Details) - CHF (SFr) SFr in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Analysis of income and expense [abstract]
Interest income	SFr 11.0	SFr 5.6	SFr 0.0
Interest income employee benefits	0.5	0.1	0.0
Financial income	11.5	5.7	0.0
Bank charges and interest expenses	(4.3)	(2.1)	(1.1)
Interest expenses leases	(6.5)	(4.2)	(2.4)
Interest expenses employee benefits	(0.5)	(0.1)	0.0
Financial expenses	(11.3)	(6.4)	(3.6)
Foreign exchange losses	(111.4)	(6.5)	(16.3)
Change in fair value of foreign exchange derivatives	0.0	0.0	1.4
Foreign exchange result	(111.4)	(6.5)	(14.9)
Financial result	SFr (111.1)	SFr (7.2)	SFr (18.5)

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The amount of costs associated with financing activities of the entity.

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The amount of income associated with interest and other financing activities of the entity.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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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]; Financial instruments, class [member]]

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- Definition

The amount of interest expense arising from defined benefit plans. [Refer: Interest expense; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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The amount of interest expense on bank loans and overdrafts. [Refer: Interest expense; Bank overdrafts]

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The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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The amount of interest income arising from defined benefit plans. [Refer: Interest income; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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The amount of income arising from interest.

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Financial Income Expense

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Net Gain (Loss) On Foreign Exchange, Including Gain (Loss) On Changes In Fair Value Of Derivatives

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No definition available.

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