Statement Of Changes In Equity [Abstract]
| Concept |
As at 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 |
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 |
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 2022-03-31 |
As at 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 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 |
As at 2021-03-31 |
As at 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
30,600,000
GBP
|
— | — | — | — | — | — |
682 .0
GBP
|
768,800,000
GBP
|
30,600,000
GBP
|
4,000,000
GBP
|
303,400,000
GBP
|
56,400,000
GBP
|
873,000,000
GBP
|
1,241,400,000
GBP
|
— |
701,500,000
GBP
|
19,500,000
GBP
|
–
GBP
|
— | — | — |
30,600,000
GBP
|
1,671,700,000
GBP
|
229,000,000
GBP
|
303,400,000
GBP
|
873,000,000
GBP
|
16,000,000
GBP
|
21 3.0
GBP
|
48,400,000
GBP
|
— | — | — | — | — | — | — |
768,800,000
GBP
|
42,700,000
GBP
|
— | — | — |
15,700,000
GBP
|
2,336,100,000
GBP
|
873,000,000
GBP
|
303,400,000
GBP
|
4 88.9
GBP
|
–
GBP
|
–
GBP
|
5 9.5
GBP
|
2 ,314.8
GBP
|
4 80.1
GBP
|
2 ,351.8
GBP
|
8,800,000
GBP
|
–
GBP
|
37,000,000
GBP
|
5 9.5
GBP
|
768,800,000
GBP
|
–
GBP
|
37,000,000
GBP
|
768,800,000
GBP
|
97,300,000
GBP
|
69,100,000
GBP
|
–
GBP
|
2,299,100,000
GBP
|
15,700,000
GBP
|
873,000,000
GBP
|
2 8.2
GBP
|
303,400,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
164,200,000
GBP
|
–
GBP
|
3,700,000
GBP
|
–
GBP
|
164,200,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
167,900,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
1,803,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
1,803,000,000
GBP
|
–
GBP
|
1,803,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
297,000,000
GBP
|
–
GBP
|
900,000
GBP
|
8,000,000
GBP
|
258,300,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
297,900,000
GBP
|
— | — | — |
–
GBP
|
46,700,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
1 1.1
GBP
|
–
GBP
|
322 .3
GBP
|
–
GBP
|
26,400,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
360,900,000
GBP
|
1,100,000
GBP
|
323,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
461,200,000
GBP
|
–
GBP
|
4,600,000
GBP
|
8,000,000
GBP
|
422,500,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
465,800,000
GBP
|
— | — | — |
–
GBP
|
46,700,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
11,100,000
GBP
|
–
GBP
|
2,125,300,000
GBP
|
–
GBP
|
26,400,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
2,163,900,000
GBP
|
1 .1
GBP
|
2,126,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
1,100,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
1,100,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
800,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
2,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
2,200,000
GBP
|
–
GBP
|
2,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
5,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5,500,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
5,500,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
3,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
3,200,000
GBP
|
–
GBP
|
3,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in equity | — |
469,000,000
GBP
|
–
GBP
|
3,500,000
GBP
|
8,000,000
GBP
|
430,300,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
472,500,000
GBP
|
— | — | — |
–
GBP
|
46,700,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
11,100,000
GBP
|
–
GBP
|
2,122,800,000
GBP
|
–
GBP
|
26,400,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
2,160,600,000
GBP
|
300,000
GBP
|
2,123,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |