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) |
462,700,000
GBP
|
419,000,000
GBP
|
–
GBP
|
43,700,000
GBP
|
419,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
678,200,000
GBP
|
215,500,000
GBP
|
–
GBP
|
–
GBP
|
1,635,300,000
GBP
|
1,631,500,000
GBP
|
3,800,000
GBP
|
399,300,000
GBP
|
1,236,000,000
GBP
|
1,631,500,000
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 |
11,800,000
GBP
|
11,800,000
GBP
|
–
GBP
|
–
GBP
|
11,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
26,900,000
GBP
|
26,900,000
GBP
|
–
GBP
|
— | — |
26,900,000
GBP
|
–
GBP
|
–
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax |
351,500,000
GBP
|
349,800,000
GBP
|
–
GBP
|
1,700,000
GBP
|
–
GBP
|
–
GBP
|
349,800,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
413,700,000
GBP
|
–
GBP
|
5,900,000
GBP
|
— | — |
407,800,000
GBP
|
–
GBP
|
407,800,000
GBP
|
| Cash flow hedges [abstract] | ||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax |
28,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
33,300,000
GBP
|
— | — | — | — | — | — | — |
| Reclassification adjustments on cash flow hedges, before tax |
34,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
63,100,000
GBP
|
— | — | — | — | — | — | — |
| Hedges of net investment in foreign operations [abstract] | ||||||||||||||||||||
| Gains (losses) on hedges of net investments in foreign operations, before tax |
92,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
173,400,000
GBP
|
— | — | — | — | — | — | — |
| Cost of hedging [abstract] | ||||||||||||||||||||
| Change in value of foreign currency basis spreads [abstract] | ||||||||||||||||||||
| Gains (losses) on change in value of foreign currency basis spreads, before tax |
6,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,800,000
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 |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,500,000
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 |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
8,200,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
265,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
389,800,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
197,400,000
GBP
|
155,400,000
GBP
|
700,000
GBP
|
42,000,000
GBP
|
407,200,000
GBP
|
–
GBP
|
251,100,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
28,000,000
GBP
|
2,025,100,000
GBP
|
1,659,900,000
GBP
|
9,700,000
GBP
|
— | — |
2,015,400,000
GBP
|
–
GBP
|
383,500,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent |
155,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,015,400,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests |
42,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
9,700,000
GBP
|
— | — | — | — | — | — | — |