Statement Of Financial Position [Abstract]
| Concept |
As at 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 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 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
90,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
89,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
103,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets |
20,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
9,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
10,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
46,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
28,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
20,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
353,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
297,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
372,700,000
GBP
|
— | — | — | — | — |
372,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
7,096,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
6,208,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
6,336,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Issued capital |
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
1,018,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
922,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,243,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
40,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
50,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
23,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
991,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
885,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,280,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
992,800,000
GBP
|
65,300,000
GBP
|
1,018,900,000
GBP
|
1,000,000
GBP
|
13,100,000
GBP
|
300,000
GBP
|
200,000
GBP
|
991,800,000
GBP
|
7,500,000
GBP
|
113,500,000
GBP
|
887,000,000
GBP
|
134,500,000
GBP
|
1,200,000
GBP
|
13,100,000
GBP
|
922,600,000
GBP
|
300,000
GBP
|
100,000
GBP
|
885,800,000
GBP
|
205,900,000
GBP
|
21,100,000
GBP
|
1,282,900,000
GBP
|
1,243,500,000
GBP
|
3,000,000
GBP
|
–
GBP
|
20,500,000
GBP
|
1,408,500,000
GBP
|
1,282,900,000
GBP
|
3,000,000
GBP
|
20,500,000
GBP
|
13,100,000
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
1,348,800,000
GBP
|
36,700,000
GBP
|
4,500,000
GBP
|
1,406,200,000
GBP
|
2,300,000
GBP
|
105,300,000
GBP
|
4,300,000
GBP
|
125,600,000
GBP
|
–
GBP
|
300,000
GBP
|
–
GBP
|
36,700,000
GBP
|
–
GBP
|
1,280,600,000
GBP
|
13,100,000
GBP
|
2,300,000
GBP
|
125,600,000
GBP
|
300,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Trade and other payables |
305,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
254,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
351,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Insurance contracts issued that are liabilities |
4,581,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
4,025,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,926,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities |
4,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
13,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
6,103,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,321,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,053,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
7,096,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
6,208,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
6,336,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |