Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
91,600,000
GBP
|
83,700,000
GBP
|
113,800,000
GBP
|
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
818,600,000
GBP
|
822,200,000
GBP
|
822,500,000
GBP
|
| Investment property [abstract] | |||
| Investment property |
277,100,000
GBP
|
278,500,000
GBP
|
317,000,000
GBP
|
| Trade and other receivables [abstract] | |||
| Prepayments and accrued income other than contract assets [abstract] | |||
| Prepayments and accrued income other than contract assets |
101,500,000
GBP
|
104,900,000
GBP
|
124,200,000
GBP
|
| Trade and other receivables |
35,200,000
GBP
|
34,500,000
GBP
|
28,400,000
GBP
|
| Categories of financial assets [abstract] | |||
| Financial assets |
3,691,600,000
GBP
|
3,696,400,000
GBP
|
4,630,300,000
GBP
|
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
1,772,200,000
GBP
|
1,003,600,000
GBP
|
955,700,000
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| 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
|
| Miscellaneous assets [abstract] | |||
| Net defined benefit asset |
1,300,000
GBP
|
1,600,000
GBP
|
12,100,000
GBP
|
| Derivative financial assets |
27,400,000
GBP
|
31,300,000
GBP
|
35,900,000
GBP
|
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other provisions |
30,800,000
GBP
|
10,200,000
GBP
|
48,100,000
GBP
|
| Borrowings [abstract] | |||
| Borrowings |
82,400,000
GBP
|
65,200,000
GBP
|
59,200,000
GBP
|
| Borrowings, by type [abstract] | |||
| Trade and other payables [abstract] | |||
| Trade and other payables |
163,600,000
GBP
|
147,000,000
GBP
|
131,800,000
GBP
|
| Miscellaneous liabilities [abstract] | |||
| Derivative financial liabilities |
15,400,000
GBP
|
29,600,000
GBP
|
19,500,000
GBP
|
| Subordinated liabilities [abstract] | |||
| Subordinated liabilities |
258,800,000
GBP
|
258,600,000
GBP
|
513,600,000
GBP
|
| Net assets (liabilities) [abstract] | |||
| Assets |
8,417,200,000
GBP
|
7,423,700,000
GBP
|
8,382,700,000
GBP
|
| Liabilities |
6,012,500,000
GBP
|
5,231,900,000
GBP
|
5,585,600,000
GBP
|
| Assets less current liabilities [abstract] |