Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-01-01 |
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 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in 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
|
7,700,000
GBP
|
300,000
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
|
298,100,000
GBP
|
100,000
GBP
|
66,000,000
GBP
|
5,300,000
GBP
|
-
GBP
|
5,300,000
GBP
|
100,000
GBP
|
7,700,000
GBP
|
312,400,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1 .4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
28,300,000
GBP
|
26,900,000
GBP
|
1,500,000
GBP
|
— | — | — | — | — | — |
3,300,000
GBP
|
— | — | — | — | — | — | — |
1,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
100,000
GBP
|
— | — | — | — |
1,400,000
GBP
|
— | — | — | — |
23,400,000
GBP
|
— | — | — | — | — |
4,300,000
GBP
|
20,600,000
GBP
|
18,600,000
GBP
|
— | — | — |
400,000
GBP
|
— | — |
4,600,000
GBP
|
— | — | — | — | — | — |
13,100,000
GBP
|
500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
1,300,000
GBP
|
— | — |
-
GBP
|
— |
1,400,000
GBP
|
— |
-
GBP
|
— |
-
GBP
|
23,400,000
GBP
|
— | — |
-
GBP
|
— | — |
24,000,000
GBP
|
47,500,000
GBP
|
20,100,000
GBP
|
— | — | — |
400,000
GBP
|
— |
-
GBP
|
7,900,000
GBP
|
— | — | — |
-
GBP
|
-
GBP
|
— |
13,100,000
GBP
|
1,300,000
GBP
|
— |
-
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
96,700,000
GBP
|
— | — | — | — | — |
87. 1
GBP
|
-
GBP
|
— | — | — | — |
9,600,000
GBP
|
— | — |
-
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,500,000
GBP
|
16,000,000
GBP
|
700,000
GBP
|
— | — | — | — | — | — |
-
GBP
|
— | — | — | — | — | — | — |
700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |