Statement Of Changes In Equity [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity | — | — |
318,800,000
GBP
|
4 7 9. 4
GBP
|
1 6 7. 1
GBP
|
— | — | — |
4. 5
GBP
|
— |
415. 2
GBP
|
1,37 6.0
GBP
|
— |
1 , 42 3 .9
GBP
|
3 6 9.1
GBP
|
— | — |
4 7 9. 4
GBP
|
— |
1 6 7. 1
GBP
|
415. 3
GBP
|
— |
7. 0
GBP
|
— |
1,482,200,000
GBP
|
4 7 9. 4
GBP
|
4 3 0 .1
GBP
|
1 6 7. 1
GBP
|
416. 7
GBP
|
11 .1
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
— | — | — |
41,400,000
GBP
|
41. 4
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
2 7. 3
GBP
|
— | — |
2 7. 3
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— |
—
GBP
|
— | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — |
2,400,000
GBP
|
— | — | — | — | — |
3,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
—
GBP
|
—
GBP
|
— | — | — |
41,400,000
GBP
|
43,800,000
GBP
|
2,500,000
GBP
|
— |
0 .1
GBP
|
— | — |
3 1 .1
GBP
|
— | — |
28. 4
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
1. 4
GBP
|
— |
4 .1
GBP
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
—
GBP
|
—
GBP
|
— | — | — |
92. 1
GBP
|
92. 1
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
8 9. 5
GBP
|
— | — |
8 9. 5
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— |
—
GBP
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
—
GBP
|
—
GBP
|
— | — | — |
400,000
GBP
|
0. 4
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
0 .1
GBP
|
— | — |
0 .1
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— |
—
GBP
|
— | — | — | — | — | — |