Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2024-12-31 |
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As at 2023-12-31 |
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As at 2022-12-31 |
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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 | — | — | — |
3,509,300,000
GBP
|
— | — | — | — | — |
3,579,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [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 |
1,660,100,000
GBP
|
707,700,000
GBP
|
100,400,000
GBP
|
2,296,900,000
GBP
|
15,100,000
GBP
|
14,400,000
GBP
|
707,700,000
GBP
|
15,100,000
GBP
|
1, 64 0.0
GBP
|
2, 36 8.1
GBP
|
10,300,000
GBP
|
15,600,000
GBP
|
2,431,100,000
GBP
|
15,500,000
GBP
|
15,100,000
GBP
|
707,700,000
GBP
|
1,645,700,000
GBP
|
47,100,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |