Statement Of Changes In Equity [Abstract]
| 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 |
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 |
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 |
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 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||
| Decrease (increase) through tax on share-based payment transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
6,000,000
GBP
|
6,000,000
GBP
|
6,000,000
GBP
|
6,600,000
GBP
|
–
GBP
|
6,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
6,600,000
GBP
|
–
GBP
|
| Increase (decrease) through transactions with owners, equity |
6 . 9
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,300,000
GBP
|
65 2 . 2
GBP
|
6 5 9 .1
GBP
|
65 3 .5
GBP
|
3 6 5 . 3
GBP
|
–
GBP
|
362,900,000
GBP
|
–
GBP
|
2,400,000
GBP
|
–
GBP
|
–
GBP
|
3 65 . 3
GBP
|
–
GBP
|