Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
988,100,000
GBP
|
900,800,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
1,271,600,000
GBP
|
1,311,700,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
3,300,000
GBP
|
5,200,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
35,300,000
GBP
|
17,600,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
337,900,000
GBP
|
289,900,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
443,000,000
GBP
|
302,600,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Cash |
112,800,000
GBP
|
106,500,000
GBP
|
| Cash and cash equivalents |
112,800,000
GBP
|
106,500,000
GBP
|
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
12,300,000
GBP
|
27,100,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
358,000,000
GBP
|
240,500,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
27,400,000
GBP
|
49,900,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
16,200,000
GBP
|
16,200,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets (liabilities) |
1,765,900,000
GBP
|
1,595,100,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
893,700,000
GBP
|
699,000,000
GBP
|
| Current liabilities |
459,900,000
GBP
|
345,400,000
GBP
|
| Current assets (liabilities) |
433,800,000
GBP
|
353,600,000
GBP
|
| Assets less current liabilities [abstract] |