Disclosure Of Fair Value Measurement [Text Block]
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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 |
1 ,1 12 .1
GBP
|
4 , 3 6 7. 3
GBP
|
3 3 5 .9
GBP
|
4 , 0 6 9. 0
GBP
|
3 ,61 6 . 4
GBP
|
5 74 . 7
GBP
|
4 52. 6
GBP
|
122. 4
GBP
|
4 , 9 5 9. 2
GBP
|
31 8 .1
GBP
|
4 ,7 32 .0
GBP
|
1 2 9. 6
GBP
|
1 ,11 8 . 3
GBP
|
191,200,000
GBP
|
570. 3
GBP
|
5 ,0 5 0 .1
GBP
|
7, 9 2 5 . 9
GBP
|
132 . 8
GBP
|
37 1. 4
GBP
|
8,0 44 . 4
GBP
|
174. 7
GBP
|
371. 4
GBP
|
8, 415 . 8
GBP
|
−
GBP
|
−
GBP
|
5 70. 3
GBP
|
8 , 2 9 7. 3
GBP
|
118. 5
GBP
|
113. 7
GBP
|
8,576,200,000
GBP
|
−
GBP
|
11 8. 5
GBP
|
1 6 9.9
GBP
|
4 . 8
GBP
|
1 ,178. 7
GBP
|
1,178,700,000
GBP
|
−
GBP
|
132. 8
GBP
|
570 . 3
GBP
|
8 , 6 8 9. 9
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |