Other current financial assets - Narrative (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [abstract]
Current contract assets	SFr 1.1	SFr 0.7

The amount of current contract assets. [Refer: Contract assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_105&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_CurrentContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant