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 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||
| Equity |
28 4.0
GBP
|
— | — | — |
293. 1
GBP
|
22 .2
GBP
|
4 8 . 6
GBP
|
400,000
GBP
|
16 .9
GBP
|
— | — | — |
35 .6
GBP
|
288 .0
GBP
|
— | — | — |
11 .1
GBP
|
— | — |
293,000,000
GBP
|
— |
400,000
GBP
|
19 .1
GBP
|
— | — |
98 .6
GBP
|
300,000
GBP
|
9,700,000
GBP
|
29 2 .6
GBP
|
13 . 6
GBP
|
2 1 7. 6
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||
| Profit (loss) | — |
—
GBP
|
6 .9
GBP
|
6 .9
GBP
|
— | — | — | — | — |
—
GBP
|
—
GBP
|
—
GBP
|
— | — |
—
GBP
|
3 .9
GBP
|
6 5 .1
GBP
|
— |
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
61. 2
GBP
|
61. 2
GBP
|
— | — | — | — | — | — |
| Comprehensive income | — |
—
GBP
|
1 .1
GBP
|
6 .9
GBP
|
— | — | — | — | — |
—
GBP
|
—
GBP
|
5,800,000
GBP
|
— | — |
—
GBP
|
3 .9
GBP
|
66 .5
GBP
|
— |
—
GBP
|
1. 4
GBP
|
— |
—
GBP
|
— | — |
62,600,000
GBP
|
61. 2
GBP
|
— | — | — | — | — | — |
| Issue of equity | — |
—
GBP
|
0 .1
GBP
|
—
GBP
|
— | — | — | — | — |
—
GBP
|
0 .1
GBP
|
—
GBP
|
— | — |
400,000
GBP
|
— | — | — |
—
GBP
|
—
GBP
|
— |
0 .1
GBP
|
— | — |
0 .5
GBP
|
—
GBP
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
—
GBP
|
5 .7
GBP
|
—
GBP
|
— | — | — | — | — |
5 .7
GBP
|
—
GBP
|
—
GBP
|
— | — |
—
GBP
|
— | — | — |
7. 3
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
7. 3
GBP
|
—
GBP
|
— | — | — | — | — | — |