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 |
9 9.0
GBP
|
9 0.4
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
175,600,000
GBP
|
181,800,000
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries reported in separate financial statements |
–
GBP
|
–
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
0. 3
GBP
|
2,100,000
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
600,000
GBP
|
4,000,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
148 .8
GBP
|
5 0.6
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
123 .9
GBP
|
8 6.6
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
2, 920.7
GBP
|
2, 90 1. 3
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
1 , 24 6 .6
GBP
|
1 , 23 4 .1
GBP
|
8 43.9
GBP
|
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
203,400,000
GBP
|
179. 3
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
8 0 7. 0
GBP
|
79 4. 2
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
31,900,000
GBP
|
31 .9
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
3 , 0 55 .1
GBP
|
2,950,900,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
236,500,000
GBP
|
236,500,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
4,792 . 2
GBP
|
4, 623 .1
GBP
|
— |
| Liabilities |
1 ,1 6 7. 0
GBP
|
1,1 0 4 .7
GBP
|
— |
| Assets (liabilities) |
3,625 . 2
GBP
|
3 , 518 . 4
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
4, 322. 5
GBP
|
4, 24 4 . 8
GBP
|
— |
| Current liabilities |
885,200,000
GBP
|
8 74 . 7
GBP
|
— |
| Assets less current liabilities [abstract] |