Disclosure Of Financial Instruments [Text Block]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|
| Disclosure of financial instruments [text block] | — | — | — | — | — | — | — | — |
| Disclosure of general hedge accounting [text block] | — | — | — | — | — | — | — | — |
| Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [text block] | — | — | — | — | — | — | — | — |
| Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [abstract] | ||||||||
| Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] | ||||||||
| Gain (loss) on hedge ineffectiveness [abstract] | ||||||||
| Gain (loss) on hedge ineffectiveness recognised in other comprehensive income |
1,500,000
GBP
|
— | — |
1,500,000
GBP
|
1,000,000
GBP
|
— | — |
1. 0
GBP
|
| Gains (losses) on cash flow hedges, net of tax | — |
13,200,000
GBP
|
— |
13,200,000
GBP
|
4,900,000
GBP
|
— |
4,900,000
GBP
|
— |
| Gains (losses) on hedges of net investments in foreign operations, net of tax | — | — |
15,000,000
GBP
|
15. 0
GBP
|
17 .2
GBP
|
17 .2
GBP
|
— | — |