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v3.25.1

Share-based payments - Weighted Average Fair Value of Options Granted and Weighted Average Assumptions (Details) | 12 Months Ended
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Dec. 31, 2024 £ / shares | Dec. 31, 2024 $ / shares | Dec. 31, 2023 £ / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 £ / shares | Dec. 31, 2022 $ / shares
Weighted Average Assumptions [abstract] |  |  |  |  |  |
Expected life (months) | 48 months | 48 months | 48 months | 48 months | 48 months | 48 months
Expected volatility | 25.00% | 25.00% | 33.00% | 33.00% | 32.00% | 32.00%
Dividend yield | 4.60% | 4.60% | 5.60% | 5.60% | 3.90% | 3.90%
United Kingdom |  |  |  |  |  |
Weighted Average Assumptions [abstract] |  |  |  |  |  |
Risk-free interest rate | 3.80% | 3.80% | 4.00% | 4.00% | 2.90% | 2.90%
United Kingdom | American depository receipts |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |
Fair value of options | £ / shares | £ 134.0 |  | £ 131.0 |  | £ 177.0 |
United States |  |  |  |  |  |
Weighted Average Assumptions [abstract] |  |  |  |  |  |
Risk-free interest rate | 4.20% | 4.20% | 4.50% | 4.50% | 4.10% | 4.10%
United States | American depository receipts |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |
Fair value of options | $ / shares |  | $ 6.9 |  | $ 8.6 |  | $ 11.5

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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 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 assumptions expected life. + References No definition available. + Details
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- Definition Weighted average assumptions. + References No definition available. + Details
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