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 |
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
|
172,100,000
GBP
|
1,100,000
GBP
|
235,100,000
GBP
|
63,000,000
GBP
|
171,000,000
GBP
|
–
GBP
|
–
GBP
|
270,100,000
GBP
|
383,200,000
GBP
|
–
GBP
|
–
GBP
|
653,300,000
GBP
|
–
GBP
|
649,300,000
GBP
|
4,000,000
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 | — |
23,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
88,900,000
GBP
|
— | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||
| Reclassification adjustments on exchange differences on translation of foreign operations, before tax | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
14,800,000
GBP
|
— | — | — |
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — |
58,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
104,200,000
GBP
|
— | — | — |
| Cash flow hedges [abstract] | ||||||||||||||||
| Reclassification adjustments on cash flow hedges, before tax | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
6,500,000
GBP
|
— | — | — |
| Other comprehensive income, before tax, cash flow hedges | — |
19,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
2,800,000
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 | — |
5,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
22,400,000
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
|
— | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — |
| Other comprehensive income |
–
GBP
|
95,500,000
GBP
|
1,000,000
GBP
|
— | — |
17,800,000
GBP
|
–
GBP
|
76,700,000
GBP
|
— | — |
–
GBP
|
90,900,000
GBP
|
157,800,000
GBP
|
–
GBP
|
66,500,000
GBP
|
400,000
GBP
|
| Comprehensive income |
–
GBP
|
76,600,000
GBP
|
100,000
GBP
|
— | — |
153,200,000
GBP
|
–
GBP
|
76,700,000
GBP
|
— | — |
–
GBP
|
90,900,000
GBP
|
811,100,000
GBP
|
–
GBP
|
715,800,000
GBP
|
4,400,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — |
76,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
806,700,000
GBP
|
— | — | — |
| Comprehensive income, attributable to non-controlling interests | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
4,400,000
GBP
|
— | — | — |