Disclosure Of Fair Value Measurement [Text Block]
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As at 2020-12-31 |
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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 |
27 , 113 . 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2 8 , 3 4 7. 9
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 |
24 ,935 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2 5,90 7 .9
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 |
2,177,800,000
GBP
|
2,500,000
GBP
|
94,700,000
GBP
|
721 . 0
GBP
|
103,900,000
GBP
|
597,100,000
GBP
|
1 , 8 5 7. 9
GBP
|
10,200,000
GBP
|
3,000,000
GBP
|
348 .4
GBP
|
322,400,000
GBP
|
2,180,300,000
GBP
|
9 7 7. 0
GBP
|
2,440,000,000
GBP
|
348 .4
GBP
|
2,800,000
GBP
|
2,441,900,000
GBP
|
597,100,000
GBP
|
322,400,000
GBP
|
4,300,000
GBP
|
94,600,000
GBP
|
2, 119. 5
GBP
|
103,900,000
GBP
|
1,900,000
GBP
|
1,056,600,000
GBP
|
1,900,000
GBP
|
2 ,19 8. 3
GBP
|
103,800,000
GBP
|
597,100,000
GBP
|
94,500,000
GBP
|
2,492,300,000
GBP
|
294,000,000
GBP
|
5,400,000
GBP
|
3,300,000
GBP
|
348,400,000
GBP
|
2,490,400,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |