Disclosure Of Fair Value Measurement [Text Block]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
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As at 2022-12-31 |
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As at 2022-12-31 |
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As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
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| Disclosure of fair value measurement [text block] |
Measurement of fair values
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | — |
1,024,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,020,300,000
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 | — |
626,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
590,700,000
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 | — |
398,600,000
GBP
|
170,800,000
GBP
|
35,700,000
GBP
|
600,000
GBP
|
38,300,000
GBP
|
111,700,000
GBP
|
71,300,000
GBP
|
29,900,000
GBP
|
360,300,000
GBP
|
1,100,000
GBP
|
1,000,000
GBP
|
429,600,000
GBP
|
600,000
GBP
|
40,600,000
GBP
|
111,700,000
GBP
|
35,700,000
GBP
|
170,900,000
GBP
|
71,300,000
GBP
|
–
GBP
|
389,000,000
GBP
|
1,000,000
GBP
|
200,000
GBP
|
109,100,000
GBP
|
35,700,000
GBP
|
600,000
GBP
|
349,600,000
GBP
|
100,000
GBP
|
1,000,000
GBP
|
310,600,000
GBP
|
39,000,000
GBP
|
111,700,000
GBP
|
16,700,000
GBP
|
71,300,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |