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Ordinary dividends - Summary of Ordinary Dividends (Details) - GBP (£)
£ / shares in Units, £ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Dividends [line items]      
Amounts recognised as distributions to equity holders, per share £ 0.3940 £ 0.3370 £ 0.2650
Amounts recognised as distributions to equity holders £ 422.8 £ 365.4 £ 314.7
Previous period final amount      
Disclosure of Dividends [line items]      
Amounts recognised as distributions to equity holders, per share £ 0.2440 £ 0.1870 £ 0.1400
Amounts recognised as distributions to equity holders £ 261.8 £ 203.5 £ 167.7
Interim period amount      
Disclosure of Dividends [line items]      
Amounts recognised as distributions to equity holders, per share £ 0.1500 £ 0.1500 £ 0.1250
Amounts recognised as distributions to equity holders £ 161.0 £ 161.9 £ 147.0