Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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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 equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||||||||
| Equity |
3, 166.6
GBP
|
1, 722. 7
GBP
|
1,263,900,000
GBP
|
8,800,000
GBP
|
2,500,000
GBP
|
500,000
GBP
|
6,800,000
GBP
|
211,200,000
GBP
|
18,600,000
GBP
|
3,0 3 0.6
GBP
|
10,400,000
GBP
|
0. 9
GBP
|
4,400,000
GBP
|
18,500,000
GBP
|
208,500,000
GBP
|
6,800,000
GBP
|
1, 130. 6
GBP
|
1,000,000
GBP
|
1, 722. 7
GBP
|
10,400,000
GBP
|
600,000
GBP
|
155,900,000
GBP
|
6,800,000
GBP
|
1, 002.3
GBP
|
2,844. 1
GBP
|
1, 722. 7
GBP
|
0. 5
GBP
|
18,500,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |