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Consolidated statements of comprehensive income / (loss) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of comprehensive income [abstract]
Net income / (loss)	SFr 57.7	SFr (170.2)	SFr (27.5)
Net actuarial result from defined benefit plans	4.4	0.9	(1.6)
Taxes on net actuarial result from defined benefit plans	(0.9)	(0.2)	0.3
Items that will not be reclassified to income statement	3.5	0.7	(1.3)
Exchange differences	(0.1)	(1.0)	0.0
Items that will be reclassified to income statement when specific conditions are met	(0.1)	(1.0)	0.0
Other comprehensive income / (loss), net of tax	3.4	(0.3)	(1.3)
Total comprehensive income / (loss)	SFr 61.1	SFr (170.5)	SFr (28.8)

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The amount of comprehensive income attributable to owners of the parent. [Refer: Comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]]

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The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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