Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
2022-01-01 to 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 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
1,9 8 3. 0
GBP
|
— |
666,400,000
GBP
|
— | — | — |
588,200,000
GBP
|
— | — |
12 . 0
GBP
|
4 41. 2
GBP
|
— |
4 9 .1
GBP
|
207 .4
GBP
|
— |
18 .7
GBP
|
— |
1, 324 . 2
GBP
|
— | — | — | — | — | — | — | — |
7 4 7. 7
GBP
|
13 . 4
GBP
|
433. 3
GBP
|
193 . 8
GBP
|
4 7. 9
GBP
|
— |
4 0 .1
GBP
|
15 2 . 0
GBP
|
— |
1,3 0 6 . 8
GBP
|
19 8 . 3
GBP
|
78 .5
GBP
|
706 .0
GBP
|
1,3 0 6 . 8
GBP
|
1 7 7. 4
GBP
|
432 . 2
GBP
|
21. 5
GBP
|
4 7. 7
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
560 .9
GBP
|
— |
–
GBP
|
— |
91. 5
GBP
|
4 69.4
GBP
|
1 . 3
GBP
|
— |
562. 2
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
–
GBP
|
82,500,000
GBP
|
8 5 .1
GBP
|
2. 6
GBP
|
–
GBP
|
255,500,000
GBP
|
338 .0
GBP
|
— | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income |
365,600,000
GBP
|
— |
10 . 3
GBP
|
— | — | — |
0 . 4
GBP
|
— |
21. 2
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
5,600,000
GBP
|
— |
391,900,000
GBP
|
— |
–
GBP
|
42,400,000
GBP
|
50,400,000
GBP
|
1 8 . 3
GBP
|
3,400,000
GBP
|
39 .7
GBP
|
— | — | — | — | — | — | — |
16 . 8
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income |
926. 5
GBP
|
— |
10 . 3
GBP
|
— | — | — |
1. 7
GBP
|
— |
5 41 . 0
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
5,600,000
GBP
|
— |
391,900,000
GBP
|
— |
–
GBP
|
42,400,000
GBP
|
13 2 . 9
GBP
|
66,800,000
GBP
|
800,000
GBP
|
3 9.7
GBP
|
— | — | — | — | — | — | — |
1 6 . 8
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity |
9 .1
GBP
|
— |
–
GBP
|
— | — | — |
–
GBP
|
— |
–
GBP
|
7. 9
GBP
|
— | — |
1. 2
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
200,000
GBP
|
–
GBP
|
1. 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — |
1 .1
GBP
|
— | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
8 6 . 3
GBP
|
— |
–
GBP
|
— | — | — |
–
GBP
|
— |
8 6 . 3
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
–
GBP
|
7 8 . 9
GBP
|
7 8 . 9
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
13 . 4
GBP
|
— |
–
GBP
|
— | — | — |
–
GBP
|
— |
13 . 4
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
–
GBP
|
9,500,000
GBP
|
9,500,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |