Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
1 ,1 12 .1
GBP
|
4 , 3 6 7. 3
GBP
|
3 3 5 .9
GBP
|
— | — | — |
4 , 0 6 9. 0
GBP
|
— |
3 ,61 6 . 4
GBP
|
5 74 . 7
GBP
|
— |
4 52. 6
GBP
|
122. 4
GBP
|
— | — | — |
4 , 9 5 9. 2
GBP
|
31 8 .1
GBP
|
— |
1 2 9. 6
GBP
|
4 ,7 32 .0
GBP
|
— |
1 ,11 8 . 3
GBP
|
191,200,000
GBP
|
570. 3
GBP
|
— | — |
5 ,0 5 0 .1
GBP
|
— | — | — |
132 . 8
GBP
|
8,0 44 . 4
GBP
|
371. 4
GBP
|
8, 415 . 8
GBP
|
−
GBP
|
174. 7
GBP
|
−
GBP
|
8 , 2 9 7. 3
GBP
|
118. 5
GBP
|
5 70. 3
GBP
|
113. 7
GBP
|
8,576,200,000
GBP
|
−
GBP
|
11 8. 5
GBP
|
1 6 9.9
GBP
|
4 . 8
GBP
|
— |
1 ,178. 7
GBP
|
570 . 3
GBP
|
1,178,700,000
GBP
|
−
GBP
|
132. 8
GBP
|
7, 9 2 5 . 9
GBP
|
37 1. 4
GBP
|
8 , 6 8 9. 9
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
8 3 .0
GBP
|
— | — | — |
−
GBP
|
−
GBP
|
6 3 7. 7
GBP
|
— |
−
GBP
|
— | — |
−
GBP
|
— | — |
720. 7
GBP
|
6 3 7. 7
GBP
|
2,901,300,000
GBP
|
— | — |
−
GBP
|
— | — |
2,9 65.1
GBP
|
— | — | — |
−
GBP
|
−
GBP
|
— |
63. 8
GBP
|
−
GBP
|
2, 965.1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9 3 7. 9
GBP
|
— | — | — | — | — | — | — | — |
| Other comprehensive income |
10. 3
GBP
|
— | — | — |
−
GBP
|
7 9.9
GBP
|
97. 9
GBP
|
— |
−
GBP
|
— | — |
−
GBP
|
— | — |
108,200,000
GBP
|
1 8 .0
GBP
|
115. 3
GBP
|
— | — |
–
GBP
|
— | — |
118. 3
GBP
|
— | — | — |
6 .9
GBP
|
−
GBP
|
— |
3 .9
GBP
|
−
GBP
|
111. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1, 080.7
GBP
|
— | — | — | — | — | — | — | — |
| Comprehensive income |
72 .7
GBP
|
— | — | — |
−
GBP
|
7 9. 9
GBP
|
5 3 9. 8
GBP
|
— |
−
GBP
|
— | — |
−
GBP
|
— | — |
612 . 5
GBP
|
6 1 9. 7
GBP
|
3,0 16.6
GBP
|
— | — |
–
GBP
|
— | — |
3,083,400,000
GBP
|
— | — | — |
6 .9
GBP
|
−
GBP
|
— |
5 9.9
GBP
|
−
GBP
|
3,076,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 42 .8
GBP
|
— | — | — | — | — | — | — | — |
| Issue of equity |
−
GBP
|
— | — | — |
−
GBP
|
−
GBP
|
4,400,000
GBP
|
— |
4,400,000
GBP
|
— | — |
−
GBP
|
— | — |
4,400,000
GBP
|
−
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
114. 5
GBP
|
— | — | — |
−
GBP
|
−
GBP
|
314. 7
GBP
|
— |
−
GBP
|
— | — |
−
GBP
|
— | — |
4 2 9. 2
GBP
|
314,700,000
GBP
|
205. 3
GBP
|
— | — |
–
GBP
|
— | — |
12 2 .0
GBP
|
— | — | — |
–
GBP
|
−
GBP
|
— |
8 3. 3
GBP
|
−
GBP
|
12 2 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
−
GBP
|
— | — | — |
3,700,000
GBP
|
−
GBP
|
–
GBP
|
— |
−
GBP
|
— | — |
−
GBP
|
— | — |
−
GBP
|
3,700,000
GBP
|
–
GBP
|
— | — |
600,000
GBP
|
— | — |
0. 6
GBP
|
— | — | — |
−
GBP
|
−
GBP
|
— |
–
GBP
|
−
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
−
GBP
|
— | — | — |
−
GBP
|
−
GBP
|
9 9. 6
GBP
|
— |
−
GBP
|
— | — |
−
GBP
|
— | — |
9 9. 6
GBP
|
9 9. 6
GBP
|
74 . 4
GBP
|
— | — |
–
GBP
|
— | — |
74 . 4
GBP
|
— | — | — |
–
GBP
|
−
GBP
|
— |
–
GBP
|
−
GBP
|
74 . 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |