Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
1,400,000
GBP
|
1,400,000
GBP
|
| Investment property [abstract] | ||
| Investment property |
1,461,000,000
GBP
|
1,561,400,000
GBP
|
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||
| Investments in joint ventures reported in separate financial statements |
1,342,400,000
GBP
|
1,451,800,000
GBP
|
| Investments in associates reported in separate financial statements |
1,297,100,000
GBP
|
1,247,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
3,200,000
GBP
|
19,500,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current restricted cash and cash equivalents |
21,400,000
GBP
|
21,400,000
GBP
|
| Non-current derivative financial assets |
7,000,000
GBP
|
18,600,000
GBP
|
| Non-current investments other than investments accounted for using equity method |
9,800,000
GBP
|
9,500,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
85,900,000
GBP
|
84,800,000
GBP
|
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
218,800,000
GBP
|
315,100,000
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 |
–
GBP
|
71,400,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current restricted cash and cash equivalents |
8,600,000
GBP
|
33,700,000
GBP
|
| Current derivative financial assets |
100,000
GBP
|
7,300,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
1,646,400,000
GBP
|
1,834,800,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
56,300,000
GBP
|
56,600,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
168,300,000
GBP
|
179,400,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current derivative financial liabilities |
23,700,000
GBP
|
59,700,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
16,100,000
GBP
|
–
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
250,100,000
GBP
|
221,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
646,000,000
GBP
|
243,500,000
GBP
|
| Miscellaneous equity [abstract] | ||
| Capital redemption reserve |
–
GBP
|
207,600,000
GBP
|
| Merger reserve |
–
GBP
|
374,100,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
4,536,400,000
GBP
|
4,913,900,000
GBP
|
| Liabilities |
1,950,000,000
GBP
|
2,167,900,000
GBP
|
| Assets (liabilities) |
2,586,400,000
GBP
|
2,746,000,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
349,600,000
GBP
|
546,600,000
GBP
|
| Current liabilities |
185,100,000
GBP
|
180,000,000
GBP
|
| Assets less current liabilities [abstract] |