Analysis Of Income And Expense [Abstract]
| Concept |
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 |
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 |
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 |
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 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||||||||
| Revenue |
1 43.2
GBP
|
— | — | — |
32,500,000
GBP
|
1 1 0.7
GBP
|
— | — | — | — | — | — | — | — |
508,600,000
GBP
|
— | — | — |
26,700,000
GBP
|
535,300,000
GBP
|
— | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||||||||||
| Investment income |
29,300,000
GBP
|
— | — | — |
29,300,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
19,100,000
GBP
|
— | — | — |
1 9.1
GBP
|
–
GBP
|
— | — | — | — |
| Operating expense |
42,700,000
GBP
|
— | — | — |
28,500,000
GBP
|
14,200,000
GBP
|
— | — | — | — | — | — | — | — |
43,600,000
GBP
|
— | — | — |
36,000,000
GBP
|
7 .6
GBP
|
— | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||||||||
| Comprehensive income |
66,800,000
GBP
|
–
GBP
|
3,100,000
GBP
|
69,900,000
GBP
|
— | — |
–
GBP
|
3,100,000
GBP
|
–
GBP
|
900,000
GBP
|
–
GBP
|
69,000,000
GBP
|
–
GBP
|
–
GBP
|
582,700,000
GBP
|
17 .7
GBP
|
2,100,000
GBP
|
–
GBP
|
— | — |
17 .7
GBP
|
565,000,000
GBP
|
562,900,000
GBP
|
–
GBP
|