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Share-based compensation - Schedule of Expenses Arising from Share-based Payment Transactions (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from equity-settled share-based payment transactions	SFr 71.5	SFr 31.8	SFr 33.8
Share-based compensation	57.5	27.3	38.3
LTIP 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from equity-settled share-based payment transactions	51.9	24.4	0.0
LTIP 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from equity-settled share-based payment transactions	0.0	0.0	32.7
Other
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from equity-settled share-based payment transactions	SFr 19.6	SFr 7.4	SFr 1.1

X

- 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.

+ Details

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 51
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2024-03-27

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- Definition

The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 106
-Subparagraph d
-Clause iii
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-URIDate 2024-03-27

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