Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
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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 |
413,200,000
GBP
|
3,500,000
GBP
|
287 .2
GBP
|
7. 7
GBP
|
409,700,000
GBP
|
114,800,000
GBP
|
361,600,000
GBP
|
245,300,000
GBP
|
104,000,000
GBP
|
356,900,000
GBP
|
4,700,000
GBP
|
7. 6
GBP
|
328,400,000
GBP
|
7. 6
GBP
|
211,900,000
GBP
|
4,300,000
GBP
|
104,600,000
GBP
|
32 4. 1
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |