Disclosure Of Fair Value Measurement [Text Block]
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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 | — | — | — | — | — | — | — | — | — |
1,236,400,000
GBP
|
1,289,200,000
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 | — | — | — | — | — | — | — | — | — |
9 19.6
GBP
|
9 67. 7
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 |
184 .0
GBP
|
9,000,000
GBP
|
144,900,000
GBP
|
12,100,000
GBP
|
9,000,000
GBP
|
30,800,000
GBP
|
2,600,000
GBP
|
306,600,000
GBP
|
10. 2
GBP
|
316,800,000
GBP
|
321,500,000
GBP
|
1 76 .0
GBP
|
30,800,000
GBP
|
11,200,000
GBP
|
144,900,000
GBP
|
9,000,000
GBP
|
3,000,000
GBP
|
310,300,000
GBP
|
7. 4
GBP
|
6,800,000
GBP
|
167 .9
GBP
|
5,000,000
GBP
|
2,400,000
GBP
|
30,800,000
GBP
|
11,000,000
GBP
|
294,400,000
GBP
|
0. 8
GBP
|
9,000,000
GBP
|
144,900,000
GBP
|
305,400,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |