Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
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As at 2020-12-31 |
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As at 2019-12-31 |
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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 | — |
8 , 3 5 9 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
7 ,842.2
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 | — |
6, 9 51 . 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
6 ,7 18 . 8
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 |
1,348,800,000
GBP
|
1,408 .5
GBP
|
3,000,000
GBP
|
3 6 .7
GBP
|
1,406 .2
GBP
|
1 3.1
GBP
|
2,300,000
GBP
|
4,300,000
GBP
|
300,000
GBP
|
1,0 04.4
GBP
|
1 0.7
GBP
|
3 .6
GBP
|
1,112,700,000
GBP
|
300,000
GBP
|
13,100,000
GBP
|
13 .1
GBP
|
1,123,400,000
GBP
|
85,400,000
GBP
|
909,400,000
GBP
|
9,200,000
GBP
|
9 .7
GBP
|
918,600,000
GBP
|
13,100,000
GBP
|
84 0.9
GBP
|
46,600,000
GBP
|
1 . 2
GBP
|
300,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |