Statement Of Comprehensive Income [Abstract]
| Concept |
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 |
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 |
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 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of 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 [abstract] | ||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — | — | — |
322,500,000
GBP
|
— | — | — | — | — |
445,600,000
GBP
|
— | — | — | — | — | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — | — | — | — | — | — |
30 .2
GBP
|
— | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — | — | — | — | — |
64,200,000
GBP
|
— | — | — | — | — |
8 4.7
GBP
|
— | — | — | — | — | — | — |
| Income tax relating to share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss | — | — | — | — | — | — |
5,700,000
GBP
|
— | — | — | — | — |
1,400,000
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
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — |
46 1.2
GBP
|
— | — | — | — | — |
2,126,400,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — |
4,600,000
GBP
|
— | — | — | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — |