Statement Of Comprehensive Income [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
4 01 . 5
GBP
|
–
GBP
|
–
GBP
|
401 . 5
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
34 6.9
GBP
|
346 .9
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) from investments in equity instruments | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1. 8
GBP
|
— |
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — |
13 .1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1 .8
GBP
|
— |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||
| Cash flow hedges [abstract] | ||||||||||||||||
| Other comprehensive income, before tax, cash flow hedges | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,900,000
GBP
|
— |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — |
4 . 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
0 .7
GBP
|
— |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
0. 3
GBP
|
— |
| Other comprehensive income |
400,000
GBP
|
–
GBP
|
32,900,000
GBP
|
–
GBP
|
–
GBP
|
12 .7
GBP
|
19. 8
GBP
|
–
GBP
|
3 1. 8
GBP
|
–
GBP
|
–
GBP
|
1 .6
GBP
|
–
GBP
|
–
GBP
|
3 4. 4
GBP
|
1. 0
GBP
|
| Comprehensive income |
400,000
GBP
|
–
GBP
|
434,400,000
GBP
|
–
GBP
|
–
GBP
|
414 . 2
GBP
|
19. 8
GBP
|
–
GBP
|
3 1.8
GBP
|
–
GBP
|
–
GBP
|
1 .6
GBP
|
–
GBP
|
–
GBP
|
3 12. 5
GBP
|
345 .9
GBP
|