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 |
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 |
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 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
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 |
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 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 | — | — | — |
1,660,100,000
GBP
|
707,700,000
GBP
|
— | — |
15,100,000
GBP
|
14,400,000
GBP
|
— | — | — |
100,400,000
GBP
|
2,296,900,000
GBP
|
— |
2, 36 8.1
GBP
|
— |
1, 64 0.0
GBP
|
— |
10,300,000
GBP
|
— | — | — | — |
15,600,000
GBP
|
707,700,000
GBP
|
— |
15,100,000
GBP
|
2,431,100,000
GBP
|
47,100,000
GBP
|
15,500,000
GBP
|
707,700,000
GBP
|
1,645,700,000
GBP
|
15,100,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
40,600,000
GBP
|
200,200,000
GBP
|
— | — |
158,500,000
GBP
|
1,100,000
GBP
|
159,600,000
GBP
|
— | — |
172,100,000
GBP
|
— |
–
GBP
|
— |
1,100,000
GBP
|
— |
235,100,000
GBP
|
171,000,000
GBP
|
–
GBP
|
6 3.0
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
90,100,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
11,600,000
GBP
|
200,000
GBP
|
78,700,000
GBP
|
— | — |
95,500,000
GBP
|
— |
76,700,000
GBP
|
— |
1,000,000
GBP
|
— | — |
17,800,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
90,100,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
170,100,000
GBP
|
900,000
GBP
|
80,900,000
GBP
|
— | — |
76,600,000
GBP
|
— |
76,700,000
GBP
|
— |
100,000
GBP
|
— | — |
153 .2
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
152. 2
GBP
|
–
GBP
|
152. 2
GBP
|
— | — |
15 0.7
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
15 0.7
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
1,800,000
GBP
|
–
GBP
|
1,800,000
GBP
|
— | — |
9,800,000
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
9,800,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
4,000,000
GBP
|
–
GBP
|
4,000,000
GBP
|
— | — |
1,600,000
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
1,600,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |