Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
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As at 2020-12-31 |
As at 2020-12-31 |
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As at 2020-12-31 |
As at 2020-12-31 |
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As at 2020-01-01 |
As at 2019-12-31 |
As at 2019-12-31 |
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As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
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As at 2019-12-31 |
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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 | — | — | — | — |
1,282,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,252,100,000
GBP
|
— |
1,200,900,000
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 | — | — | — | — |
653,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
634,100,000
GBP
|
— |
665,400,000
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 |
333,600,000
GBP
|
100,000
GBP
|
1,500,000
GBP
|
132,800,000
GBP
|
628,900,000
GBP
|
385,200,000
GBP
|
16,200,000
GBP
|
47,500,000
GBP
|
75,600,000
GBP
|
300,800,000
GBP
|
13,300,000
GBP
|
100,000
GBP
|
75,600,000
GBP
|
385,200,000
GBP
|
24,100,000
GBP
|
132,800,000
GBP
|
618,000,000
GBP
|
100,000
GBP
|
535,500,000
GBP
|
540,800,000
GBP
|
66,000,000
GBP
|
298,100,000
GBP
|
300,000
GBP
|
7,700,000
GBP
|
132,800,000
GBP
|
11,000,000
GBP
|
298,100,000
GBP
|
11,000,000
GBP
|
535,500,000
GBP
|
307,100,000
GBP
|
132,800,000
GBP
|
100,000
GBP
|
66,000,000
GBP
|
5,300,000
GBP
|
5,300,000
GBP
|
-
GBP
|
100,000
GBP
|
7,700,000
GBP
|
312,400,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |