The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2025-03-27

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Period Type:	instant

- Definition

The amount of current interest payable. [Refer: Interest payable]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
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Period Type:	instant

- 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 non-current interest payable. [Refer: Interest payable]

+ References

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

+ Details

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- Definition

The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
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Financial Liabilities - Borrowings - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions	Dec. 31, 2025 GBP (£)	Dec. 31, 2025 EUR (€)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	May 31, 2025 EUR (€)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 USD ($)
Disclosure of detailed information about borrowings [line items]
Accrued interest included in non-current borrowings	£ 13					£ 13
Accrued interest included in current borrowings	0					2
Notional amount	1,531					3,130
Undrawn borrowing capacity on revolving credit facility \| $				$ 800
Undrawn borrowing capacity [Member]
Disclosure of detailed information about borrowings [line items]
Undrawn borrowing capacity on revolving credit facility	£ 1,000		$ 1,400			£ 800		$ 1,000
1.375% Euro notes 2025 [member]
Disclosure of detailed information about borrowings [line items]
Notional amount \| €		€ 300			€ 300		€ 300
Borrowings, interest rate	1.375%	1.375%	1.375%		1.375%	1.375%	1.375%	1.375%
5.375% GBP notes 2024 [member]
Disclosure of detailed information about borrowings [line items]
Notional amount						£ 350
Borrowings, interest rate						5.375%	5.375%	5.375%