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Share-based payments - Summary of Information about Awards Granted (Detail)	12 Months Ended
	Dec. 31, 2025 yr £ / shares	Dec. 31, 2024 yr £ / shares	Dec. 31, 2023 yr £ / shares
APP/DAP
Information regarding option pricing models and assumptions used for grants during the year [line items]
Weighted average share price (pence) (in dollar per share) | £ / shares	£ 94.201	£ 84.818	£ 55.717
Term (years) | yr	2.9	2.2	2.3
LTIP/DAP
Information regarding option pricing models and assumptions used for grants during the year [line items]
Weighted average share price (pence) (in dollar per share) | £ / shares	£ 92.50	£ 79.40	£ 53.18
Expected dividend yield	1.84%	2.12%
Risk-free interest rate	3.88%	4.20%	3.85%
Volatility	21.00%	26.00%
Term (years) | yr	2.8	3.0	3.0
LTIP/DAP | Minimum
Information regarding option pricing models and assumptions used for grants during the year [line items]
Expected dividend yield			2.52%
Volatility			29.00%
LTIP/DAP | Maximum
Information regarding option pricing models and assumptions used for grants during the year [line items]
Expected dividend yield			2.77%
Volatility			30.00%

X

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2025-03-27

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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2025-03-27

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2025-03-27

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2025-03-27

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X

- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2025-01-01
-Paragraph 47
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-URIDate 2025-03-27

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- Definition

fair value of share award using monte carlo pricing model and weighted average assumptions.

+ References

No definition available.

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