Income taxes - Net Deferred Tax Assets and Liabilities (Details) - CHF (SFr) SFr in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Abstract]
Net amount at January 1	SFr 13.9	SFr (3.4)	SFr 0.3
thereof deferred tax assets	31.7	2.2	5.9
thereof deferred tax liabilities	(17.9)	(5.6)	(5.7)
Taxes charged
to income statement	18.6	(3.6)	SFr 1.0
to other comprehensive income	(0.9)	(0.2)
Exchange differences	(0.4)	0.1
Net amount at December 31	SFr (3.4)	SFr 0.3

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

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The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

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Income Taxes [Abstract]

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