Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
896. 4
GBP
|
7 9 0 .9
GBP
|
8 76 . 0
GBP
|
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
1 , 3 5 9. 5
GBP
|
1 , 3 8 9. 3
GBP
|
1,4 68.8
GBP
|
| Goodwill |
7 ,6 12.3
GBP
|
7,388,800,000
GBP
|
10, 110.6
GBP
|
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
41 2 .9
GBP
|
3 30. 7
GBP
|
813 .0
GBP
|
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
1 52. 6
GBP
|
156. 2
GBP
|
137 .6
GBP
|
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
11, 36 2.3
GBP
|
1 0 ,9 72 . 3
GBP
|
11 ,82 2. 3
GBP
|
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
3, 8 82 .9
GBP
|
1 2 , 8 9 9.1
GBP
|
11, 30 5.7
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale |
–
GBP
|
–
GBP
|
485. 3
GBP
|
| Miscellaneous assets [abstract] | |||
| Investments other than investments accounted for using equity method |
318. 3
GBP
|
3 8 7. 3
GBP
|
498 . 3
GBP
|
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
4,216,800,000
GBP
|
4 ,9 75 . 5
GBP
|
4 , 0 4 7. 3
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
5 6 7. 2
GBP
|
8 , 61 9. 2
GBP
|
8, 79 8.0
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
6 1 9. 9
GBP
|
313. 5
GBP
|
4 4 9. 6
GBP
|
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
1 5,2 5 2.3
GBP
|
1 3 , 8 5 9. 7
GBP
|
1 4 ,1 8 8 .1
GBP
|
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
1 36 . 6
GBP
|
156 .7
GBP
|
1 5 9. 0
GBP
|
| Issued capital [abstract] | |||
| Issued capital |
122 . 4
GBP
|
1 2 9. 6
GBP
|
132,800,000
GBP
|
| Retained earnings [abstract] | |||
| Retained earnings |
4 , 3 6 7. 3
GBP
|
4 ,9 5 9. 2
GBP
|
8 , 5 76 . 2
GBP
|
| Net assets (liabilities) [abstract] | |||
| Assets (liabilities) |
4 , 0 6 9. 0
GBP
|
5 ,0 5 0 .1
GBP
|
8 , 2 9 7. 3
GBP
|
| Net current assets (liabilities) [abstract] | |||
| Current assets |
15,33 5.6
GBP
|
2 3 ,98 1 . 7
GBP
|
23,755. 9
GBP
|
| Current liabilities |
1 6 , 4 8 5 . 4
GBP
|
2 3 , 2 2 7.1
GBP
|
24,054,300,000
GBP
|
| Current assets (liabilities) |
1 , 1 4 9. 8
GBP
|
754 .6
GBP
|
2 98 . 4
GBP
|
| Assets less current liabilities [abstract] | |||
| Assets less current liabilities |
11, 38 5. 4
GBP
|
1 2 ,9 4 0 . 0
GBP
|
15,528. 3
GBP
|