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 |
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 |
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 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||||||
| Equity |
1,3 24. 2
GBP
|
— | — | — | — | — | — | — | — |
7 4 7. 7
GBP
|
13 . 4
GBP
|
43 3. 3
GBP
|
193 . 8
GBP
|
4 7. 9
GBP
|
— |
4 0 .1
GBP
|
15 2 . 0
GBP
|
— | — |
19 8 . 3
GBP
|
78 .5
GBP
|
— |
706. 0
GBP
|
— |
1, 3 0 6 . 8
GBP
|
— |
1 7 7. 4
GBP
|
— | — | — |
43 2. 2
GBP
|
— |
21. 5
GBP
|
4 7. 7
GBP
|
— | — |
15 3. 4
GBP
|
–
GBP
|
8 7. 2
GBP
|
4 7. 5
GBP
|
6 9 7. 3
GBP
|
4 30.0
GBP
|
76. 0
GBP
|
1,3 39. 4
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
82,500,000
GBP
|
8 5 .1
GBP
|
2 .6
GBP
|
25 5. 5
GBP
|
–
GBP
|
338 . 0
GBP
|
— | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
0. 5
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
1 0 5 .1
GBP
|
25,900,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
7 9. 2
GBP
|
7 9 .7
GBP
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
42,400,000
GBP
|
50,400,000
GBP
|
18 . 3
GBP
|
3,400,000
GBP
|
— |
39 .7
GBP
|
— | — | — | — | — | — |
16 . 8
GBP
|
— | — |
–
GBP
|
2,600,000
GBP
|
— | — |
9,600,000
GBP
|
— |
8 .7
GBP
|
— |
–
GBP
|
— | — | — |
127 . 1
GBP
|
— |
–
GBP
|
— | — |
82 . 5
GBP
|
28 .9
GBP
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
42,400,000
GBP
|
13 2 . 9
GBP
|
66. 8
GBP
|
0. 8
GBP
|
— |
3 9.7
GBP
|
— | — | — | — | — | — |
16 . 8
GBP
|
— | — |
–
GBP
|
3 .1
GBP
|
— | — |
9,600,000
GBP
|
— |
8,700,000
GBP
|
— |
–
GBP
|
— | — | — |
1 2 7.1
GBP
|
— |
–
GBP
|
— | — |
3,300,000
GBP
|
10 8 .6
GBP
|
— | — | — | — | — | — | — | — |
| Issue of equity | — |
200,000
GBP
|
–
GBP
|
1,300,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
1 .1
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
2,200,000
GBP
|
— | — | — |
–
GBP
|
— |
200,000
GBP
|
— | — |
2,400,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
78 .9
GBP
|
7 8 .9
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
–
GBP
|
— |
–
GBP
|
— | — |
7 0 . 9
GBP
|
70 . 9
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
9,500,000
GBP
|
9,500,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
–
GBP
|
— |
–
GBP
|
— | — |
7. 4
GBP
|
7. 4
GBP
|
— | — | — | — | — | — | — | — |