Statement Of Comprehensive Income [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 comprehensive income [abstract] | ||||||||||||||||||
| Profit (loss) |
1 . 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
9 97. 9
GBP
|
9 9 6 .7
GBP
|
9 97. 9
GBP
|
528. 8
GBP
|
–
GBP
|
5 27. 8
GBP
|
–
GBP
|
1 .0
GBP
|
–
GBP
|
–
GBP
|
528. 8
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income |
–
GBP
|
–
GBP
|
–
GBP
|
5 0 . 1
GBP
|
–
GBP
|
–
GBP
|
5 0 . 1
GBP
|
5 0 . 1
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
4 0.6
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
4 0.6
GBP
|
40,600,000
GBP
|
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||
| Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income |
–
GBP
|
–
GBP
|
–
GBP
|
1,400,000
GBP
|
–
GBP
|
–
GBP
|
1 .4
GBP
|
1,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1 . 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1. 8
GBP
|
1 . 8
GBP
|
| Other comprehensive income | — | — | — | — | — | — | — |
52 .5
GBP
|
— | — | — |
39,900,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income |
1 . 5
GBP
|
–
GBP
|
6,600,000
GBP
|
4 8 .7
GBP
|
–
GBP
|
1 0 . 1
GBP
|
9 45 .7
GBP
|
94 4.2
GBP
|
9 97. 9
GBP
|
528,800,000
GBP
|
–
GBP
|
5 6 7.7
GBP
|
3,400,000
GBP
|
0 . 9
GBP
|
–
GBP
|
2 .4
GBP
|
568,600,000
GBP
|
38. 8
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — |
9 45 .7
GBP
|
— | — | — |
568,600,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — |
1 . 5
GBP
|
— | — | — |
0 . 9
GBP
|
— | — | — | — | — | — |