Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-12-31 |
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 |
39,600,000
GBP
|
41,300,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
2,800,000
GBP
|
3,100,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
2,295,000,000
GBP
|
2,247,100,000
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
2,700,000
GBP
|
6,600,000
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
–
GBP
|
7,700,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current derivative financial assets |
8,500,000
GBP
|
400,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
15,800,000
GBP
|
18,100,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
113,900,000
GBP
|
167,400,000
GBP
|
235,700,000
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 |
20,300,000
GBP
|
44,200,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
932,500,000
GBP
|
862,500,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
173,400,000
GBP
|
169,100,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
58,600,000
GBP
|
57,600,000
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current derivative financial liabilities |
–
GBP
|
100,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
–
GBP
|
700,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
11,000,000
GBP
|
11,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,011,300,000
GBP
|
1,147,900,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
2,501,400,000
GBP
|
2,538,500,000
GBP
|
— |
| Liabilities |
1,280,600,000
GBP
|
1,207,800,000
GBP
|
— |
| Assets (liabilities) |
1,220,800,000
GBP
|
1,330,700,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
129,700,000
GBP
|
185,500,000
GBP
|
— |
| Current liabilities |
234,000,000
GBP
|
231,900,000
GBP
|
— |
| Assets less current liabilities [abstract] |