Disclosure Of Fair Value Measurement [Text Block]
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||||||||||
| Assets | — | — | — | — |
1,778,200,000
GBP
|
— | — | — | — | — | — | — | — |
1,904,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||||||||||
| Liabilities | — | — | — | — |
1,220,600,000
GBP
|
— | — | — | — | — | — | — | — |
1,233,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||||
| Equity |
369,600,000
GBP
|
62,000,000
GBP
|
3,400,000
GBP
|
53,900,000
GBP
|
557,600,000
GBP
|
23,900,000
GBP
|
28,800,000
GBP
|
16,000,000
GBP
|
58,000,000
GBP
|
155,400,000
GBP
|
24,100,000
GBP
|
3,400,000
GBP
|
369,600,000
GBP
|
670,300,000
GBP
|
43,800,000
GBP
|
16,000,000
GBP
|
268,200,000
GBP
|
369,600,000
GBP
|
2,700,000
GBP
|
73,600,000
GBP
|
21,600,000
GBP
|
796,200,000
GBP
|
43,800,000
GBP
|
16,700,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |