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 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | |||||||||||||||||
| Profit (loss) |
–
GBP
|
−
GBP
|
682. 7
GBP
|
–
GBP
|
775 . 4
GBP
|
–
GBP
|
682 .7
GBP
|
92. 7
GBP
|
8 3 .0
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
6 3 7. 7
GBP
|
720,700,000
GBP
|
6 3 7. 7
GBP
|
2, 901.3
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 |
–
GBP
|
−
GBP
|
16,600,000
GBP
|
–
GBP
|
16. 6
GBP
|
–
GBP
|
16,600,000
GBP
|
–
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
14 .3
GBP
|
14. 3
GBP
|
14. 3
GBP
|
2,000,000
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 |
–
GBP
|
−
GBP
|
7. 4
GBP
|
–
GBP
|
7. 4
GBP
|
–
GBP
|
7. 4
GBP
|
–
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
−
GBP
|
3. 0
GBP
|
3,000,000
GBP
|
3,000,000
GBP
|
7. 4
GBP
|
| Other comprehensive income |
–
GBP
|
–
GBP
|
305,600,000
GBP
|
2 9 9. 4
GBP
|
320. 8
GBP
|
–
GBP
|
6,200,000
GBP
|
15. 2
GBP
|
10. 3
GBP
|
−
GBP
|
−
GBP
|
7 9.9
GBP
|
−
GBP
|
97 .9
GBP
|
10 8. 2
GBP
|
18 .0
GBP
|
115,300,000
GBP
|
| Comprehensive income |
–
GBP
|
–
GBP
|
988 .3
GBP
|
2 9 9. 4
GBP
|
1,096 .2
GBP
|
–
GBP
|
6 8 8 .9
GBP
|
1 0 7. 9
GBP
|
72 .7
GBP
|
−
GBP
|
−
GBP
|
7 9.9
GBP
|
−
GBP
|
5 3 9. 8
GBP
|
6 12.5
GBP
|
61 9. 7
GBP
|
3,016,600,000
GBP
|
| Comprehensive income attributable to [abstract] | |||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — |
988 . 3
GBP
|
— | — | — | — | — | — | — | — | — |
5 3 9. 8
GBP
|
— |
3,0 76.5
GBP
|
| Comprehensive income, attributable to non-controlling interests | — | — | — | — |
1 0 7. 9
GBP
|
— | — | — | — | — | — | — | — | — |
72. 7
GBP
|
— |
5 9.9
GBP
|