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 |
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 |
91,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
83,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
113,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
96,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
73,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
76,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property |
277,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
278,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
317,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Insurance contracts issued that are assets |
5,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
17,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
13,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
40,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
41,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets |
82,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
71,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
14,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
56,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
89,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
29,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other receivables |
35,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
34,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
28,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
1,772,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,003,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
955,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
8,417,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
7,423,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
8,382,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
2,404,700,000
GBP
|
484,700,000
GBP
|
346,500,000
GBP
|
3,600,000
GBP
|
—
GBP
|
143,100,000
GBP
|
200,000
GBP
|
29,900,000
GBP
|
2,058,200,000
GBP
|
1,456,900,000
GBP
|
2,191,800,000
GBP
|
283,400,000
GBP
|
39,000,000
GBP
|
143,100,000
GBP
|
—
GBP
|
—
GBP
|
900,000
GBP
|
1,845,300,000
GBP
|
346,500,000
GBP
|
1,456,900,000
GBP
|
2,797,100,000
GBP
|
41,400,000
GBP
|
1,454,800,000
GBP
|
890,800,000
GBP
|
1,454,800,000
GBP
|
3,500,000
GBP
|
3,500,000
GBP
|
41,400,000
GBP
|
2,896,700,000
GBP
|
—
GBP
|
2,797,100,000
GBP
|
7,500,000
GBP
|
346,500,000
GBP
|
346,500,000
GBP
|
1,500,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
982,900,000
GBP
|
—
GBP
|
145,200,000
GBP
|
7,500,000
GBP
|
1,500,000
GBP
|
2,550,200,000
GBP
|
300,000
GBP
|
—
GBP
|
96,100,000
GBP
|
96,100,000
GBP
|
96,100,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
2,450,600,000
GBP
|
300,000
GBP
|
145,200,000
GBP
|
4,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Trade and other payables |
163,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
147,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
131,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Provisions [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other provisions |
30,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
10,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
48,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Insurance contracts issued that are liabilities |
5,238,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
4,625,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
4,725,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reinsurance contracts held that are liabilities |
116,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
13,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
6,012,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,231,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,585,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
8,417,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
7,423,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
8,382,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |