Statement Of Changes In Equity [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 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 |
As at 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 |
As at 2024-12-31 |
As at 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 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 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 |
2023-01-01 to 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 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 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 |
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 | — | — | — | — | — |
131 .3
GBP
|
290,400,000
GBP
|
— |
177 .1
GBP
|
— |
31 .6
GBP
|
1. 8
GBP
|
38,800,000
GBP
|
1 1 .1
GBP
|
— | — |
668,100,000
GBP
|
— |
1 0.0
GBP
|
669,900,000
GBP
|
— | — |
792,300,000
GBP
|
— | — | — |
404,000,000
GBP
|
— |
129,800,000
GBP
|
1 0.1
GBP
|
— | — | — |
1. 5
GBP
|
177 .1
GBP
|
— |
33,100,000
GBP
|
52,300,000
GBP
|
15,600,000
GBP
|
790,800,000
GBP
|
782,000,000
GBP
|
5,100,000
GBP
|
1. 1
GBP
|
177 .1
GBP
|
129,800,000
GBP
|
359,800,000
GBP
|
5,200,000
GBP
|
33,100,000
GBP
|
81 .2
GBP
|
780,900,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
20,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — |
20,000,000
GBP
|
700,000
GBP
|
— |
20,700,000
GBP
|
— | — |
86,800,000
GBP
|
–
GBP
|
— |
85,600,000
GBP
|
–
GBP
|
–
GBP
|
— |
1. 2
GBP
|
— | — |
85,600,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 0.2
GBP
|
— | — |
27 .9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
4,000,000
GBP
|
1 0.1
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
13,500,000
GBP
|
— | — | — | — |
19,600,000
GBP
|
400,000
GBP
|
— |
1 0.5
GBP
|
— | — |
58,900,000
GBP
|
–
GBP
|
— |
58,500,000
GBP
|
1. 9
GBP
|
–
GBP
|
— |
400,000
GBP
|
— | — |
85,500,000
GBP
|
–
GBP
|
28,900,000
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
–
GBP
|
42,800,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — |
42,800,000
GBP
|
100,000
GBP
|
— |
42,900,000
GBP
|
— | — |
40,600,000
GBP
|
–
GBP
|
— |
40,600,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
40,600,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
600,000
GBP
|
600,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— |
600,000
GBP
|
— | — |
5,100,000
GBP
|
–
GBP
|
— |
5,100,000
GBP
|
5,100,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |