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 |
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 |
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) |
56,300,000
GBP
|
47,300,000
GBP
|
–
GBP
|
–
GBP
|
9,000,000
GBP
|
47,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
76,900,000
GBP
|
20,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
96,700,000
GBP
|
88,000,000
GBP
|
8,700,000
GBP
|
–
GBP
|
–
GBP
|
3,300,000
GBP
|
100,000,000
GBP
|
–
GBP
|
88,000,000
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 |
11,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations |
32,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,500,000
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 |
500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
43,800,000
GBP
|
40,600,000
GBP
|
–
GBP
|
–
GBP
|
3,200,000
GBP
|
12,000,000
GBP
|
–
GBP
|
29,900,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
1,300,000
GBP
|
–
GBP
|
–
GBP
|
19,500,000
GBP
|
2,100,000
GBP
|
800,000
GBP
|
100,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
18,700,000
GBP
|
–
GBP
|
16,700,000
GBP
|
| Comprehensive income |
12,500,000
GBP
|
6,700,000
GBP
|
–
GBP
|
–
GBP
|
5,800,000
GBP
|
35,300,000
GBP
|
–
GBP
|
29,900,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
1,300,000
GBP
|
–
GBP
|
–
GBP
|
116,200,000
GBP
|
90,100,000
GBP
|
9,500,000
GBP
|
100,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
106,700,000
GBP
|
–
GBP
|
16,700,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent |
6,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
106,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests |
5,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |