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Share-based payments - Summary of Information about Awards Granted (Detail) | 12 Months Ended
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Dec. 31, 2024 yr £ / shares | Dec. 31, 2023 yr £ / shares | Dec. 31, 2023 yr $ / shares | Dec. 31, 2022 yr £ / shares | Dec. 31, 2022 yr $ / shares
Annual Performance Plan [member] |  |  |  |  |
Information regarding option pricing models and assumptions used for grants during the year [line items] |  |  |  |  |
Weighted average share price (pence) | (per share) | £ 84.818 |  | $ 5,571.7 |  | $ 5,018.3
Term (years) | 2.2 | 2.3 | 2.3 | 1.7 | 1.7
Long Term Incentive Plan [member] |  |  |  |  |
Information regarding option pricing models and assumptions used for grants during the year [line items] |  |  |  |  |
Weighted average share price (pence) | £ / shares | £ 79.40 | £ 53.18 |  | £ 48.75 |
Expected dividend yield | 2.12% |  |  |  |
Risk-free interest rate | 4.20% | 3.85% | 3.85% | 1.29% | 1.29%
Volatility | 26.00% |  |  |  |
Term (years) | 3 | 3 | 3 | 3 | 3
Long Term Incentive Plan [member] | Bottom of range [member] |  |  |  |  |
Information regarding option pricing models and assumptions used for grants during the year [line items] |  |  |  |  |
Expected dividend yield |  | 2.52% | 2.52% | 2.29% | 2.29%
Volatility |  | 29.00% | 29.00% | 35.00% | 35.00%
Long Term Incentive Plan [member] | Top of range [member] |  |  |  |  |
Information regarding option pricing models and assumptions used for grants during the year [line items] |  |  |  |  |
Expected dividend yield |  | 2.77% | 2.77% | 2.67% | 2.67%
Volatility |  | 30.00% | 30.00% | 45.00% | 45.00%

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- 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 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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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 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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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 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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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 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- 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 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition fair value of share award using monte carlo pricing model and weighted average assumptions. + References No definition available. + Details
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