Analysis Of Income And Expense [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||
| Revenue [abstract] | ||||||||||||||||
| Revenue | — | — |
–
GBP
|
1,889,600,000
GBP
|
— | — |
1,889,600,000
GBP
|
— | — | — |
1,390,300,000
GBP
|
— | — |
1,390,300,000
GBP
|
–
GBP
|
— |
| Material income and expense [abstract] | ||||||||||||||||
| Operating expense excluding cost of sales | — | — |
30,400,000
GBP
|
470,300,000
GBP
|
— | — |
500,700,000
GBP
|
— | — | — |
342,100,000
GBP
|
— | — |
312,500,000
GBP
|
29,600,000
GBP
|
— |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations | — | — | — | — | — | — |
61,100,000
GBP
|
— | — | — |
15,000,000
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — | — | — | — | — |
8,300,000
GBP
|
— | — | — |
9,700,000
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — | — | — |
400,000
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income |
2,100,000
GBP
|
–
GBP
|
— | — |
63,100,000
GBP
|
–
GBP
|
292,100,000
GBP
|
353,100,000
GBP
|
243,200,000
GBP
|
–
GBP
|
228,200,000
GBP
|
100,000
GBP
|
–
GBP
|
— | — |
15,100,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — |
290,000,000
GBP
|
— | — | — |
228,100,000
GBP
|
— | — | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — |
2,100,000
GBP
|
— | — | — |
100,000
GBP
|
— | — | — | — | — |