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Commitments and contingencies - Schedule of Future Lease Commitments (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Gross lease liabilities	SFr 331.1	SFr 385.7
Due in less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Gross lease liabilities	16.9	15.8
Due 1 - 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Gross lease liabilities	135.8	145.4
Due > 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Gross lease liabilities	SFr 178.5	SFr 224.5

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2024-01-01
-Paragraph 58
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-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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