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 |
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 |
2022-01-01 to 2022-12-31 |
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 |
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 |
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 |
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 |
7 82 .0
GBP
|
— | — | — | — | — | — |
13 4. 9
GBP
|
1,100,000
GBP
|
17 7.1
GBP
|
3 59.8
GBP
|
5. 2
GBP
|
3 3 .1
GBP
|
8 1. 2
GBP
|
7 80. 9
GBP
|
— | — | — | — |
6 . 2
GBP
|
319. 4
GBP
|
1 3 7. 5
GBP
|
— | — | — |
68 5.4
GBP
|
— |
23,800,000
GBP
|
— |
6 8 4 .7
GBP
|
— |
1 7 7.1
GBP
|
3 3 .1
GBP
|
700,000
GBP
|
— | — |
3 0 6 .7
GBP
|
0 .9
GBP
|
6 80 .5
GBP
|
3 3 .1
GBP
|
6,900,000
GBP
|
3 7. 9
GBP
|
13 2. 6
GBP
|
1 7 7. 1
GBP
|
6 8 1. 4
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
–
GBP
|
74 . 3
GBP
|
7 3.7
GBP
|
600,000
GBP
|
— | — | — | — | — | — | — | — |
73 .7
GBP
|
–
GBP
|
–
GBP
|
0 .5
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
5 9. 5
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
6 0.0
GBP
|
5 9.5
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — |
59. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
12 . 0
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
–
GBP
|
3. 4
GBP
|
13 3.7
GBP
|
7 9.3
GBP
|
400,000
GBP
|
— | — | — | — | — | — | — | — |
13 3. 3
GBP
|
–
GBP
|
5 7. 4
GBP
|
0. 2
GBP
|
— | — | — |
–
GBP
|
1. 0
GBP
|
4 8 .2
GBP
|
— |
–
GBP
|
— |
1 4 .1
GBP
|
— |
–
GBP
|
— | — | — |
4 8. 0
GBP
|
6 1. 3
GBP
|
— | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
–
GBP
|
38 .5
GBP
|
38,500,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
38,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
49,000,000
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
4 9.0
GBP
|
4 9.0
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
1,700,000
GBP
|
1,700,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
1,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
4,700,000
GBP
|
4 .7
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
4,700,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |