Statement Of Comprehensive Income [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||
| Profit (loss) |
560 .9
GBP
|
–
GBP
|
91. 5
GBP
|
4 69.4
GBP
|
1 . 3
GBP
|
562. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
82,500,000
GBP
|
8 5 .1
GBP
|
2. 6
GBP
|
–
GBP
|
255,500,000
GBP
|
338 .0
GBP
|
–
GBP
|
–
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 |
28 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
24 .4
GBP
|
— | — | — | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Cash flow hedges [abstract] | ||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax |
3 4 6 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
593. 1
GBP
|
— | — | — | — | — | — | — |
| Reclassification adjustments on cash flow hedges, before tax |
2 5 6 .1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
432 .9
GBP
|
— | — | — | — | — | — | — |
| Cost of hedging [abstract] | ||||||||||||||||||||
| Change in value of foreign currency basis spreads [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, change in value of foreign currency basis spreads |
7. 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
19 . 0
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 |
7. 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
6 .1
GBP
|
— | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to cash flow hedges included in other comprehensive income |
15 0 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
43,900,000
GBP
|
— | — | — | — | — | — | — |
| Income tax relating to change in value of foreign currency basis spreads included in other comprehensive income |
1. 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2. 2
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
365,600,000
GBP
|
10 . 3
GBP
|
— | — |
0 . 4
GBP
|
21. 2
GBP
|
–
GBP
|
–
GBP
|
5,600,000
GBP
|
391,900,000
GBP
|
–
GBP
|
42,400,000
GBP
|
50,400,000
GBP
|
1 8 . 3
GBP
|
3,400,000
GBP
|
39 .7
GBP
|
— | — |
16 . 8
GBP
|
–
GBP
|
| Comprehensive income |
926. 5
GBP
|
10 . 3
GBP
|
— | — |
1. 7
GBP
|
5 41 . 0
GBP
|
–
GBP
|
–
GBP
|
5,600,000
GBP
|
391,900,000
GBP
|
–
GBP
|
42,400,000
GBP
|
13 2 . 9
GBP
|
66,800,000
GBP
|
800,000
GBP
|
3 9.7
GBP
|
— | — |
1 6 . 8
GBP
|
–
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent |
9 28.2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
13 2 .1
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests |
1. 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
0. 8
GBP
|
— | — | — | — | — | — | — |