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 |
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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||||
| Interest income | — | — | — | — | — | — |
400,000
GBP
|
— |
–
GBP
|
0 .4
GBP
|
500,000
GBP
|
— |
–
GBP
|
— | — | — | — |
0. 5
GBP
|
— | — |
| Revenue | — | — | — | — | — | — |
5 ,17 3. 9
GBP
|
— |
8 5. 9
GBP
|
5,088,000,000
GBP
|
4 ,24 4 .7
GBP
|
— |
9,700,000
GBP
|
— | — | — | — |
4 , 2 35 . 0
GBP
|
— | — |
| Material income and expense [abstract] | ||||||||||||||||||||
| Gains (losses) on disposals of non-current assets [abstract] | ||||||||||||||||||||
| Gains (losses) on disposals of non-current assets | — | — | — | — | — | — |
9. 4
GBP
|
— |
–
GBP
|
9 .4
GBP
|
5 .9
GBP
|
— |
–
GBP
|
— | — | — | — |
5 . 9
GBP
|
— | — |
| Interest expense | — | — | — | — | — | — |
70. 9
GBP
|
— |
0. 3
GBP
|
7 1 . 2
GBP
|
76. 3
GBP
|
— |
8 . 6
GBP
|
— | — | — | — |
6 7. 7
GBP
|
— | — |
| Selling, general and administrative expense [abstract] | ||||||||||||||||||||
| General and administrative expense | — | — | — | — | — | — |
4 4 8 . 4
GBP
|
— |
21,500,000
GBP
|
4 69. 9
GBP
|
4 2 2 .0
GBP
|
— |
31. 0
GBP
|
— | — | — | — |
391,000,000
GBP
|
— | — |
| Expenses by nature [abstract] | ||||||||||||||||||||
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||||||||||||||||||||
| Depreciation and amortisation expense [abstract] | ||||||||||||||||||||
| Depreciation expense | — | — | — | — | — | — |
164 . 5
GBP
|
— |
0. 5
GBP
|
165 .0
GBP
|
133. 1
GBP
|
— |
–
GBP
|
— | — | — | — |
133. 1
GBP
|
— | — |
| Amortisation expense | — | — | — | — | — | — |
3 4. 4
GBP
|
— |
–
GBP
|
3 4 . 4
GBP
|
3 8 . 4
GBP
|
— |
–
GBP
|
— | — | — | — |
38 . 4
GBP
|
— | — |
| Disclosure of attribution of expenses by nature to their function [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of attribution of expenses by nature to their function [abstract] | ||||||||||||||||||||
| Disclosure of attribution of expenses by nature to their function [line items] | ||||||||||||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||||
| Share of profit (loss) of associates accounted for using equity method | — | — | — | — | — | — |
0. 3
GBP
|
— |
–
GBP
|
0. 3
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income |
3 .1
GBP
|
9. 6
GBP
|
8,700,000
GBP
|
108,600,000
GBP
|
–
GBP
|
1 2 7.1
GBP
|
— |
–
GBP
|
— |
3. 3
GBP
|
2 14. 2
GBP
|
15 6 . 8
GBP
|
— |
9. 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
41 .6
GBP
|
89. 7
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — | — |
0. 2
GBP
|
2 14. 2
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — | — |
3 .1
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |