Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
1,400,000
GBP
|
2,300,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
1,561,400,000
GBP
|
2,152,800,000
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in joint ventures reported in separate financial statements |
1,451,800,000
GBP
|
1,813,600,000
GBP
|
— |
| Investments in associates reported in separate financial statements |
1,247,000,000
GBP
|
1,298,400,000
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
19,500,000
GBP
|
3,400,000
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 |
18,600,000
GBP
|
6,600,000
GBP
|
— |
| Non-current investments other than investments accounted for using equity method |
9 .5
GBP
|
9 .7
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
84,800,000
GBP
|
105,900,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
309,700,000
GBP
|
409,500,000
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 |
71,400,000
GBP
|
–
GBP
|
— |
| Miscellaneous current assets [abstract] | |||
| Current restricted cash and cash equivalents |
39,100,000
GBP
|
28,300,000
GBP
|
— |
| Current derivative financial assets |
7,300,000
GBP
|
9,100,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
1,8 34.8
GBP
|
2,143,700,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
–
GBP
|
115,000,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
56,600,000
GBP
|
103,200,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
179,400,000
GBP
|
205,000,000
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current derivative financial liabilities |
59,700,000
GBP
|
84,700,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
–
GBP
|
2,300,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
221,000,000
GBP
|
202,900,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
243,500,000
GBP
|
663,000,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
471,100,000
GBP
|
666,000,000
GBP
|
— |
| Reserve of cash flow hedges |
1,700,000
GBP
|
3,400,000
GBP
|
— |
| Reserve of gains and losses on hedging instruments that hedge investments in equity instruments |
362,800,000
GBP
|
519,200,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Reserve of share-based payments |
9,400,000
GBP
|
8,900,000
GBP
|
11,300,000
GBP
|
| Capital redemption reserve |
198,200,000
GBP
|
19 8.2
GBP
|
14,300,000
GBP
|
| Merger reserve |
374,100,000
GBP
|
374,100,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
4,913,900,000
GBP
|
5,90 6.3
GBP
|
— |
| Liabilities |
2,167,900,000
GBP
|
2,697,400,000
GBP
|
— |
| Assets (liabilities) |
2, 746.0
GBP
|
3,208,900,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
546,600,000
GBP
|
552,800,000
GBP
|
— |
| Current liabilities |
180,000,000
GBP
|
323,600,000
GBP
|
— |
| Assets less current liabilities [abstract] |