Inventories - Narrative (Details) - CHF (SFr) SFr in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Inventory [Line Items]
Consignment inventory	SFr 7.8	SFr 4.0
Cost of sales
Disclosure Of Inventory [Line Items]
Cost of inventories recognised as expense during period	719.7	549.6
Write-downs (reversals of write-downs) of inventories	SFr 23.0	SFr 6.3

The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 98
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_98_a&doctype=Standard
-URIDate 2024-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration