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Authorised and issued share capital - Additional Information (Details) - Ordinary shares - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]      
Number of the ordinary shares of the Company held by the ESOP (in shares) 490,646 1,211,974 5,803,641
Market value of the ordinary shares of the Company held by the ESOP £ 3.7 £ 9.9 £ 65.0
Number of ordinary shares held in treasury (in shares) 66,675,497 70,489,953 70,489,953
Ordinary shares held in treasury at market value £ 502.1 £ 578.2 £ 789.1