Statement Of Changes In Equity [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity | — |
1,787,700,000
GBP
|
295,500,000
GBP
|
191,600,000
GBP
|
9,900,000
GBP
|
— | — | — |
1,219,500,000
GBP
|
— | — |
91. 0
GBP
|
— | — | — | — | — |
32,600,000
GBP
|
9,900,000
GBP
|
181. 1
GBP
|
295,500,000
GBP
|
1,300 .3
GBP
|
— |
1, 799.6
GBP
|
9,600,000
GBP
|
1,219,400,000
GBP
|
33. 1
GBP
|
181. 1
GBP
|
295,500,000
GBP
|
1,719,500,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
3 7 .8
GBP
|
— |
–
GBP
|
37 .8
GBP
|
— |
–
GBP
|
–
GBP
|
123,900,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
123,900,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
900,000
GBP
|
— |
0. 4
GBP
|
1,300,000
GBP
|
— |
–
GBP
|
–
GBP
|
1,800,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
1,800,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
36,900,000
GBP
|
— |
400,000
GBP
|
36,500,000
GBP
|
— |
–
GBP
|
–
GBP
|
125. 7
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
125,700,000
GBP
|
— | — | — | — | — | — | — |
| Issue of equity |
–
GBP
|
— | — | — | — |
–
GBP
|
10,500,000
GBP
|
–
GBP
|
— |
56,600,000
GBP
|
6 7. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
43,900,000
GBP
|
— |
–
GBP
|
43,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
44,800,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
44,800,000
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— |
1,400,000
GBP
|
1,400,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
–
GBP
|
— | — | — | — | — |
1,600,000
GBP
|
— | — | — | — | — | — | — |