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v3.25.1

Share-based payments - Additional Information (Details) £ / shares in Units, £ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 performanceCriteria £ / shares | Dec. 31, 2024 performanceCriteria $ / shares | Dec. 31, 2023 £ / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 GBP (£) £ / shares | Dec. 31, 2022 GBP (£) $ / shares | Dec. 31, 2024 employee | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 shares | Dec. 31, 2024 £ / shares | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 shares | Dec. 31, 2023 £ / shares | Dec. 31, 2023 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares under option (in shares) | 28,000,000 | 28,000,000 | 25,000,000 | 25,000,000 | 23,000,000 | 23,000,000 |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average share price (pound/usd per share) | £ 7.72 |  | £ 8.41 |  | £ 9.13 |  |  |  |  |  |  |  |  |
American depository receipts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average share price (pound/usd per share) | $ / shares |  | $ 49.33 |  | $ 52.31 |  | $ 56.80 |  |  |  |  |  |  |  |
Bottom of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  | £ 44.1 |  |  |  |
Top of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  |  |  |  | £ 115.9 |  |  |  |
Executive Performance Share Plan (EPSP) | Bottom of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Executive Performance Share Plan (EPSP) | Top of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Number of performance conditions | performanceCriteria | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total Shareholder Return on vesting period | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Threshold performance vesting percentage | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Bonus-related Share Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 2 years | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Leadership Share Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Number of key executives participating in restricted stock plans | employee |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |
Restricted stock plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares vested | £ |  |  |  |  | £ 65 | $ 65 |  | £ 136 |  |  | £ 82 |  |  |
WSOP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares under option (in shares) | 28,000,000 | 28,000,000 | 24,000,000 | 24,000,000 | 21,000,000 | 21,000,000 |  |  |  |  |  |  |  |
WSOP | Bottom of Range |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold period for employment participation in employee stock ownership plan | 2 years | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 10 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |
WWOP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares under option (in shares) | 0 | 0 | 1,000,000 | 1,000,000 | 2,000,000 | 2,000,000 |  |  | 0 |  |  | 650,825 |  |
Number of ADRs under option (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 72,695 |  |
Exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 102.67
WWOP | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share (in pound per share) |  |  |  |  |  |  |  |  |  |  |  |  | £ 13.15 |
Executive Stock Option Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares under option (in shares) | shares |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |

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