The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2025-01-01
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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 nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
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BORROWINGS - Senior Notes (Details) € in Millions, SFr in Millions, $ in Millions	Dec. 31, 2025 CHF (SFr)	Dec. 31, 2025 EUR (€)	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,337.2		SFr 4,676.8
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	4,345.7		4,687.1
Sunrise holding senior note
Disclosure of detailed information about borrowings [line items]
Borrowings	267.8		628.0
Sunrise holding senior note \| Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 268.0		SFr 629.3
3.875% senior notes
Disclosure of detailed information about borrowings [line items]
Interest rate	3.875%	3.875%	3.875%	3.875%	3.875%
Original issue amount \| €		€ 635.0			€ 635.0
Borrowings	SFr 267.8		SFr 269.9
3.875% senior notes \| Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 268.0	€ 287.9	SFr 270.4		€ 287.9
5.50% senior notes
Disclosure of detailed information about borrowings [line items]
Interest rate			5.50%	5.50%	5.50%
Original issue amount \| $				$ 550.0
Borrowings			SFr 358.1
5.50% senior notes \| Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings			SFr 358.9	$ 395.3