Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
113,800,000
GBP
|
146,100,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
822,500,000
GBP
|
786,800,000
GBP
|
| Investment property [abstract] | ||
| Investment property |
317,000,000
GBP
|
292,100,000
GBP
|
| Categories of financial assets [abstract] | ||
| Financial assets |
4,633,600,000
GBP
|
4,681,400,000
GBP
|
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
955,700,000
GBP
|
1,220,100,000
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 |
41,200,000
GBP
|
—
GBP
|
| Miscellaneous assets [abstract] | ||
| Net defined benefit asset |
12,100,000
GBP
|
9,000,000
GBP
|
| Derivative financial assets |
35,900,000
GBP
|
73,400,000
GBP
|
| Borrowings [abstract] | ||
| Borrowings |
59,200,000
GBP
|
51,900,000
GBP
|
| Borrowings, by type [abstract] | ||
| Trade and other payables [abstract] | ||
| Trade and other payables |
457,300,000
GBP
|
549,900,000
GBP
|
| Miscellaneous liabilities [abstract] | ||
| Derivative financial liabilities |
19,500,000
GBP
|
57,200,000
GBP
|
| Subordinated liabilities [abstract] | ||
| Subordinated liabilities |
513,600,000
GBP
|
516,600,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
9,308,600,000
GBP
|
9,622,300,000
GBP
|
| Liabilities |
6,411,900,000
GBP
|
6,576,100,000
GBP
|
| Assets less current liabilities [abstract] |