Statement Of Changes In Equity [Abstract]
| Concept |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
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2023-04-01 to 2024-03-31 |
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As at 2024-03-31 |
2022-04-01 to 2023-03-31 |
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2022-04-01 to 2023-03-31 |
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2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 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 2022-03-31 |
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| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity | — | — | — | — |
1 , 882 .4
GBP
|
9,1 70. 8
GBP
|
— |
4 0 7. 6
GBP
|
— |
1 1 ,053. 2
GBP
|
7, 3 4 5 . 0
GBP
|
74 9. 9
GBP
|
820. 1
GBP
|
548. 1
GBP
|
52 .6
GBP
|
— |
11 ,8 03 .1
GBP
|
— | — | — | — | — | — |
2 .6
GBP
|
— | — | — | — | — | — |
10,43 4. 1
GBP
|
1 , 882. 4
GBP
|
4 41 . 2
GBP
|
8, 551 .7
GBP
|
1 1,08 3. 2
GBP
|
821 .2
GBP
|
5 4 7. 0
GBP
|
52 .6
GBP
|
— |
6 49. 1
GBP
|
6 , 6 5 7. 6
GBP
|
32 . 1
GBP
|
— | — | — | — | — | — |
9 ,128.8
GBP
|
1 ,0 51. 0
GBP
|
6,600,000
GBP
|
7 7. 5
GBP
|
8 , 0 7 7. 8
GBP
|
9,09 6 .6
GBP
|
1 ,0 51 .0
GBP
|
7 7. 5
GBP
|
8,045 .6
GBP
|
32. 2
GBP
|
32. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
32. 2
GBP
|
32. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
835,100,000
GBP
|
4 9. 2
GBP
|
536. 5
GBP
|
9 , 1 3 7. 2
GBP
|
40,600,000
GBP
|
6 , 57 2.9
GBP
|
40,600,000
GBP
|
9, 169.4
GBP
|
49. 2
GBP
|
536. 5
GBP
|
6,600,000
GBP
|
835,100,000
GBP
|
6,5 40.7
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
155 .8
GBP
|
1,7 28.6
GBP
|
1 ,783 .6
GBP
|
73,100,000
GBP
|
— | — |
–
GBP
|
— |
1,7 10.5
GBP
|
— | — | — | — | — | — |
1 ,884.4
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1 ,710.5
GBP
|
100,800,000
GBP
|
–
GBP
|
— |
84. 2
GBP
|
38,800,000
GBP
|
–
GBP
|
123,000,000
GBP
|
1,790,800,000
GBP
|
1 ,851 . 4
GBP
|
— | — | — | — | — | — | — | — |
2 3.6
GBP
|
— | — | — |
60,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1 23.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — |
181 . 2
GBP
|
–
GBP
|
— | — |
33. 6
GBP
|
— |
181 . 2
GBP
|
— | — | — | — | — | — |
181 . 2
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
11 2 .9
GBP
|
–
GBP
|
3 4.7
GBP
|
— |
32 9.4
GBP
|
–
GBP
|
36 3.7
GBP
|
32 9.4
GBP
|
— | — | — | — | — | — | — | — | — | — |
5. 1
GBP
|
— | — | — |
334. 5
GBP
|
–
GBP
|
25. 5
GBP
|
–
GBP
|
–
GBP
|
59. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — |
1 ,6 02 .4
GBP
|
73. 1
GBP
|
— | — |
33,600,000
GBP
|
— |
1 , 529. 3
GBP
|
— | — | — | — | — | — |
1 ,7 03. 2
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1,597 .6
GBP
|
100,800,000
GBP
|
34,700,000
GBP
|
— |
24 5 . 2
GBP
|
38,800,000
GBP
|
363,700,000
GBP
|
20 6. 4
GBP
|
— | — | — | — | — | — | — | — | — | — |
28 .7
GBP
|
— | — | — |
27 3 .9
GBP
|
–
GBP
|
25. 5
GBP
|
–
GBP
|
–
GBP
|
182. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — |
956 .4
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
956 .4
GBP
|
— | — | — | — | — | — |
956 .4
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
956 .4
GBP
|
–
GBP
|
–
GBP
|
— |
955 .8
GBP
|
–
GBP
|
–
GBP
|
955 .8
GBP
|
— | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — |
955. 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
955. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
2 0.2
GBP
|
–
GBP
|
— | — |
–
GBP
|
— |
20. 2
GBP
|
— | — | — | — | — | — |
2 0.2
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
20. 2
GBP
|
–
GBP
|
–
GBP
|
— |
18 .7
GBP
|
–
GBP
|
–
GBP
|
18,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — |
18 .7
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
18 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |