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 |
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) |
–
GBP
|
–
GBP
|
86,800,000
GBP
|
1,200,000
GBP
|
8 5.6
GBP
|
–
GBP
|
8 5.6
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
73 .7
GBP
|
–
GBP
|
74 . 3
GBP
|
–
GBP
|
7 3.7
GBP
|
0. 6
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans |
–
GBP
|
–
GBP
|
0. 1
GBP
|
–
GBP
|
0. 1
GBP
|
–
GBP
|
0. 1
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5,600,000
GBP
|
–
GBP
|
5 .6
GBP
|
–
GBP
|
5 .6
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income that will not be reclassified to profit or loss, net of tax | — | — |
0. 1
GBP
|
— | — | — | — | — | — | — | — | — | — |
5,600,000
GBP
|
— | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, net of tax | — | — |
29 .7
GBP
|
— | — | — | — | — | — | — | — | — | — |
57 .2
GBP
|
— | — | — | — |
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations |
–
GBP
|
–
GBP
|
29,700,000
GBP
|
0. 8
GBP
|
–
GBP
|
–
GBP
|
28 . 9
GBP
|
–
GBP
|
28 .9
GBP
|
–
GBP
|
–
GBP
|
57 .4
GBP
|
–
GBP
|
57 .2
GBP
|
–
GBP
|
–
GBP
|
0. 2
GBP
|
57 .4
GBP
|
| Cash flow hedges [abstract] | ||||||||||||||||||
| Gains (losses) on cash flow hedges, net of tax |
–
GBP
|
–
GBP
|
400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
400,000
GBP
|
400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
0 .3
GBP
|
0 .3
GBP
|
300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Hedges of net investment in foreign operations [abstract] | ||||||||||||||||||
| Gains (losses) on hedges of net investments in foreign operations, net of tax |
–
GBP
|
–
GBP
|
1. 5
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,500,000
GBP
|
1,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3. 1
GBP
|
3. 1
GBP
|
3. 1
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income that will be reclassified to profit or loss, net of tax | — | — |
27,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
53. 8
GBP
|
— | — | — | — |
| Other comprehensive income | — | — |
27,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
59. 4
GBP
|
— | — | — | — |
| Comprehensive income |
–
GBP
|
–
GBP
|
58,900,000
GBP
|
400,000
GBP
|
85 .5
GBP
|
–
GBP
|
58 .5
GBP
|
1,900,000
GBP
|
28 .9
GBP
|
–
GBP
|
–
GBP
|
13 3. 3
GBP
|
3. 4
GBP
|
13 3 . 7
GBP
|
–
GBP
|
79. 3
GBP
|
0. 4
GBP
|
57 .4
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
58,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
13 3 . 3
GBP
|
— | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — | — |