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 |
2 , 310 .7
GBP
|
1 , 9 41 .1
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
188 .6
GBP
|
181 .8
GBP
|
— |
| Goodwill |
416 . 3
GBP
|
24 8 . 2
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
4 8 .9
GBP
|
9,500,000
GBP
|
— |
| Non-current derivative financial assets |
3 5 7. 5
GBP
|
103 . 8
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
19 9 .1
GBP
|
208 . 2
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
3 1 7. 4
GBP
|
289. 8
GBP
|
404. 1
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 or as held for distribution to owners |
–
GBP
|
2 61 . 3
GBP
|
— |
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
888,600,000
GBP
|
179,500,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
1 , 320.4
GBP
|
1, 065 . 7
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
40,600,000
GBP
|
–
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
–
GBP
|
1. 3
GBP
|
— |
| Non-current derivative financial liabilities |
54 1.8
GBP
|
14 2 .1
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
96 2 . 7
GBP
|
311 .5
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
4 7. 7
GBP
|
4 7. 5
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
19 8 . 3
GBP
|
153 .4
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of change in value of forward elements of forward contracts |
1 7 7. 4
GBP
|
76 . 0
GBP
|
— |
| Reserve of change in value of foreign currency basis spreads |
78,500,000
GBP
|
8 7. 2
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets (liabilities) |
1, 306 .8
GBP
|
1, 3 39.4
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
2, 3 48 .4
GBP
|
1 ,61 2 .7
GBP
|
— |
| Current liabilities |
2 , 2 32 . 9
GBP
|
1,308 .0
GBP
|
— |
| Current assets (liabilities) |
115. 5
GBP
|
304,700,000
GBP
|
— |
| Assets less current liabilities [abstract] |