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Equity - Schedule of monthly breakdown of shares purchased and the average price paid per share (Details) - Treasury shares purchased during the year - £ / shares
 1 Months Ended 12 Months Ended
Oct. 06, 2022
Jun. 30, 2023
May 31, 2023
Apr. 30, 2023
Mar. 31, 2023
Feb. 28, 2023
Jan. 31, 2023
Dec. 31, 2022
Nov. 30, 2022
Oct. 31, 2022
Sep. 30, 2022
Aug. 31, 2022
Jul. 31, 2022
Jun. 30, 2023
Disclosure of classes of share capital [line items]                            
Average price paid pence (in GBP per share) £ 37.02 £ 33.48 £ 35.34 £ 36.72 £ 35.41 £ 35.77 £ 35.58 £ 37.10 £ 36.79 £ 0 £ 37.44 £ 38.20 £ 35.67 £ 36.17
Authorised purchases unutilised at month end (in shares) 173,704,983 196,247,438 196,658,000 201,854,558 204,738,508 209,092,285 210,811,162 218,801,077 223,373,000 227,870,414 173,836,847 176,110,073 177,756,956 196,247,438
Share buyback programme                            
Disclosure of classes of share capital [line items]                            
Number of shares purchased under share buyback programme (in shares) 131,864 410,562 5,196,558 2,883,950 4,353,777 1,718,877 7,989,915 4,571,923 4,497,414 0 2,273,226 1,646,883 1,660,507 37,335,456
Total number of shares purchased (in shares) 131,864 410,562 5,196,558 2,883,950 4,353,777 1,718,877 7,989,915 4,571,923 4,497,414 0 2,273,226 1,646,883 1,660,507 37,335,456