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 |
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 |
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 |
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 |
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 |
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 |
2021-01-01 to 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 |
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 |
2,177,800,000
GBP
|
— | — | — | — | — |
2,500,000
GBP
|
94,700,000
GBP
|
721 . 0
GBP
|
103,900,000
GBP
|
597,100,000
GBP
|
1 , 8 5 7. 9
GBP
|
10,200,000
GBP
|
3,000,000
GBP
|
— | — | — |
348 .4
GBP
|
— | — | — |
322,400,000
GBP
|
2,180,300,000
GBP
|
— | — |
103,900,000
GBP
|
9 7 7. 0
GBP
|
— |
322,400,000
GBP
|
4,300,000
GBP
|
— |
2,440,000,000
GBP
|
— |
2,441,900,000
GBP
|
348 .4
GBP
|
2,800,000
GBP
|
2, 119. 5
GBP
|
— |
597,100,000
GBP
|
— | — | — | — | — |
94,600,000
GBP
|
1,900,000
GBP
|
— | — |
1,900,000
GBP
|
1,056,600,000
GBP
|
2 ,19 8. 3
GBP
|
103,800,000
GBP
|
597,100,000
GBP
|
94,500,000
GBP
|
2,492,300,000
GBP
|
2,490,400,000
GBP
|
294,000,000
GBP
|
5,400,000
GBP
|
3,300,000
GBP
|
348,400,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
231 .7
GBP
|
2 31. 1
GBP
|
600,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
231 . 1
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
231,100,000
GBP
|
— | — |
–
GBP
|
800,000
GBP
|
— | — |
–
GBP
|
— | — |
15 .0
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
15,000,000
GBP
|
— | — |
15. 8
GBP
|
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
700,000
GBP
|
0. 5
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
700,000
GBP
|
200,000
GBP
|
— |
–
GBP
|
–
GBP
|
700,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
600,000
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— |
500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
600,000
GBP
|
— | — |
0. 6
GBP
|
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
2 31 .0
GBP
|
230. 6
GBP
|
600,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
230,400,000
GBP
|
200,000
GBP
|
— |
–
GBP
|
–
GBP
|
230,400,000
GBP
|
— | — |
–
GBP
|
800,000
GBP
|
— | — |
–
GBP
|
— | — |
15 .6
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— |
500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
15,600,000
GBP
|
— | — |
16 . 4
GBP
|
15,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
15,600,000
GBP
|
15,600,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
15 .6
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
15,600,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
800,000
GBP
|
— | — |
–
GBP
|
— | — |
800,000
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
800,000
GBP
|
— | — |
–
GBP
|
800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
2,100,000
GBP
|
3,800,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
5,900,000
GBP
|
2. 1
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
2,100,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
4,800,000
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1,100,000
GBP
|
4,800,000
GBP
|
— | — |
4,800,000
GBP
|
3,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in equity | — |
–
GBP
|
31,200,000
GBP
|
2 5.4
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
5,900,000
GBP
|
31. 2
GBP
|
–
GBP
|
— |
100,000
GBP
|
–
GBP
|
31,200,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
62 . 4
GBP
|
— |
100,000
GBP
|
— | — | — | — |
28,400,000
GBP
|
— |
–
GBP
|
100,000
GBP
|
–
GBP
|
1,100,000
GBP
|
34,000,000
GBP
|
— | — |
34,000,000
GBP
|
63,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |