Statement Of Changes In Equity [Abstract]
| Concept |
As at 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 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 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 |
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 |
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 |
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 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
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 |
3, 166.6
GBP
|
1, 722. 7
GBP
|
— | — |
1,263,900,000
GBP
|
8,800,000
GBP
|
— |
2,500,000
GBP
|
— |
6,800,000
GBP
|
500,000
GBP
|
211,200,000
GBP
|
18,600,000
GBP
|
— | — | — | — |
3,0 3 0.6
GBP
|
0. 9
GBP
|
10,400,000
GBP
|
4,400,000
GBP
|
18,500,000
GBP
|
— | — |
208,500,000
GBP
|
6,800,000
GBP
|
1, 130. 6
GBP
|
— | — |
1,000,000
GBP
|
1, 722. 7
GBP
|
— |
10,400,000
GBP
|
600,000
GBP
|
155,900,000
GBP
|
6,800,000
GBP
|
1, 002.3
GBP
|
2,844. 1
GBP
|
1, 722. 7
GBP
|
0. 5
GBP
|
18,500,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
263,200,000
GBP
|
263,200,000
GBP
|
186,300,000
GBP
|
— | — | — | — | — |
185,900,000
GBP
|
— | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
11,900,000
GBP
|
— |
67 . 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — |
13,200,000
GBP
|
10,400,000
GBP
|
— | — |
2. 7
GBP
|
— |
1,500,000
GBP
|
— | — | — | — | — |
275. 1
GBP
|
276,500,000
GBP
|
118,600,000
GBP
|
— | — | — | — | — |
176. 7
GBP
|
4,900,000
GBP
|
— | — | — |
52,600,000
GBP
|
0. 4
GBP
|
— | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — |
0 .1
GBP
|
— |
0. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
138. 7
GBP
|
138. 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |