Disclosure Of Fair Value Measurement [Text Block]
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2023-01-01 to 2023-12-31 |
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As at 2021-12-31 |
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| Disclosure of fair value measurement [text block] |
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| 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 | — |
1,9 8 3. 0
GBP
|
666,400,000
GBP
|
588,200,000
GBP
|
12 . 0
GBP
|
4 41. 2
GBP
|
4 9 .1
GBP
|
207 .4
GBP
|
18 .7
GBP
|
1, 324 . 2
GBP
|
7 4 7. 7
GBP
|
13 . 4
GBP
|
433. 3
GBP
|
193 . 8
GBP
|
4 7. 9
GBP
|
4 0 .1
GBP
|
15 2 . 0
GBP
|
1,3 0 6 . 8
GBP
|
19 8 . 3
GBP
|
78 .5
GBP
|
706 .0
GBP
|
1,3 0 6 . 8
GBP
|
1 7 7. 4
GBP
|
21. 5
GBP
|
432 . 2
GBP
|
4 7. 7
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |