Liquidity risk - Assets Pledged as Security (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of Financial Risk Management [Abstract]
Trade receivables	SFr 280.8	SFr 145.8
Inventory	211.7	285.2
Assets pledged	SFr 492.5	SFr 431.0

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Classes of contingent liabilities [domain]; Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 14
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2024-03-27

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