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 | — |
889,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
952,400,000
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 | — |
523,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
584,200,000
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 |
1,749,100,000
GBP
|
366,400,000
GBP
|
9,600,000
GBP
|
700,000
GBP
|
–
GBP
|
1,400,000,000
GBP
|
400,000
GBP
|
6,600,000
GBP
|
1,400,000,000
GBP
|
900,000
GBP
|
1,747 .6
GBP
|
9,600,000
GBP
|
–
GBP
|
400,000
GBP
|
368,200,000
GBP
|
9,700,000
GBP
|
500,000
GBP
|
404,200,000
GBP
|
10,000,000
GBP
|
–
GBP
|
–
GBP
|
1,782,200,000
GBP
|
1,400,000,000
GBP
|
12,500,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |