Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 |
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 |
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 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity |
1 , 5 6 7. 0
GBP
|
— | — | — | — | — | — |
6 9. 3
GBP
|
— |
34,200,000
GBP
|
14 6 . 7
GBP
|
14 3 . 0
GBP
|
820 .4
GBP
|
3 7. 6
GBP
|
315 . 8
GBP
|
1, 5 3 2 . 8
GBP
|
— | — | — |
1, 0 0 8 .7
GBP
|
14 2 .1
GBP
|
— |
2 2 7.1
GBP
|
— | — |
1,13 0 . 5
GBP
|
— | — |
–
GBP
|
1,1 0 8 .9
GBP
|
14 6 . 7
GBP
|
— |
21. 6
GBP
|
38,500,000
GBP
|
— | — |
19. 3
GBP
|
96 2.8
GBP
|
1, 0 41.9
GBP
|
3 9. 4
GBP
|
–
GBP
|
24 8.2
GBP
|
14 6 . 7
GBP
|
1, 0 61. 2
GBP
|
141. 2
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
6 . 2
GBP
|
11. 2
GBP
|
5,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
11. 2
GBP
|
–
GBP
|
4 .9
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
117. 0
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — |
121,900,000
GBP
|
117. 0
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
293,600,000
GBP
|
288,000,000
GBP
|
11 . 7
GBP
|
6 .1
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
2 81.9
GBP
|
–
GBP
|
800,000
GBP
|
— | — |
–
GBP
|
— |
2 2.0
GBP
|
7 9. 8
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — |
7 9. 0
GBP
|
5 7. 8
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
293,600,000
GBP
|
2 81. 8
GBP
|
2 2 .9
GBP
|
11 .1
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
270. 7
GBP
|
–
GBP
|
4 .1
GBP
|
— | — |
–
GBP
|
— |
22. 0
GBP
|
19 6 . 8
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — |
2 0 0 .9
GBP
|
174 . 8
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity | — |
–
GBP
|
–
GBP
|
315 . 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
315 . 8
GBP
|
— | — | — | — | — | — | — |
315 . 8
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
10 . 2
GBP
|
10 . 2
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
10 . 2
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
10 . 0
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — |
10 . 0
GBP
|
10 . 0
GBP
|
— | — | — | — | — | — | — | — | — |