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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
Jun. 30, 2022
May 31, 2022
Apr. 30, 2022
Mar. 31, 2022
Feb. 28, 2022
Jan. 31, 2022
Dec. 31, 2021
Nov. 30, 2021
Oct. 31, 2021
Sep. 30, 2021
Aug. 31, 2021
Jul. 31, 2021
Jun. 30, 2022
Disclosure of classes of share capital [line items]                          
Average price paid pence (in GBP per share) £ 35.84 £ 37.24 £ 39.35 £ 35.88 £ 37.14 £ 37.97 £ 39.60 £ 37.85 £ 35.50 £ 34.93 £ 35.38 £ 34.57 £ 37.08
Authorised purchases unutilised at month end (in shares) 179,417,463 186,188,868 198,816,572 206,077,136 214,557,872 220,423,582 226,246,325 230,669,356 232,045,302 222,186,588 225,362,524 227,758,747 179,417,463
Share buyback programme                          
Disclosure of classes of share capital [line items]                          
Number of shares purchased under share buyback programme (in shares) 6,771,405 12,627,704 7,260,564 8,480,736 5,865,710 5,822,743 4,423,031 1,375,946 1,565,980 3,175,936 2,396,223 1,728,254 61,494,232
Total number of shares purchased (in shares) 6,771,405 12,627,704 7,260,564 8,480,736 5,865,710 5,822,743 4,423,031 1,375,946 1,565,980 3,175,936 2,396,223 1,728,254 61,494,232