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Authorised and issued share capital - Summary of Authorized and Issued Share Capital (Details)
£ in Millions
 12 Months Ended
Dec. 31, 2023
GBP (£)
shares
Dec. 31, 2022
GBP (£)
shares
Dec. 31, 2021
GBP (£)
shares
Dec. 31, 2020
GBP (£)
shares
Disclosure of classes of share capital [line items]        
Issued and fully paid capital, Beginning balance £ 114.1      
Share cancellations   £ (807.4) £ (729.3)  
Issued and fully paid capital, Ending balance £ 114.1 £ 114.1    
Ordinary shares        
Disclosure of classes of share capital [line items]        
Equity ordinary shares, authorised (in shares) | shares 1,750,000,000 1,750,000,000 1,750,000,000 1,750,000,000
Nominal value of Authorised shares £ 175.0 £ 175.0 £ 175.0 £ 175.0
Number of shares issued and fully paid, Beginning balance (in shares) | shares 1,141,427,296 1,224,459,550 1,296,080,242  
Exercise of share options (in shares) | shares 85,900 125,700 534,800  
Share cancellations (in shares) | shares 0 (83,157,954) (72,155,492)  
Number of shares issued and fully paid, Ending balance (in shares) | shares 1,141,513,196 1,141,427,296 1,224,459,550  
Issued and fully paid capital, Beginning balance £ 114.1 £ 122.4 £ 129.6  
Exercise of share options 0.0 0.0 0.0  
Share cancellations 0.0 (8.3) (7.2)  
Issued and fully paid capital, Ending balance £ 114.1 £ 114.1 £ 122.4