Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
964,500,000
GBP
|
988,100,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
1,253,200,000
GBP
|
1,271,600,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
3,400,000
GBP
|
3,300,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
123,200,000
GBP
|
35,300,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
375,800,000
GBP
|
337,900,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
464,000,000
GBP
|
443,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Cash |
320,600,000
GBP
|
112,800,000
GBP
|
| Cash and cash equivalents |
320,600,000
GBP
|
112,800,000
GBP
|
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
4,500,000
GBP
|
12,300,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
320,000,000
GBP
|
358,000,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
23,100,000
GBP
|
27,400,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
15,100,000
GBP
|
16,200,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets (liabilities) |
2,431,100,000
GBP
|
1,765,900,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
1,160,400,000
GBP
|
893,700,000
GBP
|
| Current liabilities |
487,800,000
GBP
|
459,900,000
GBP
|
| Current assets (liabilities) |
672,600,000
GBP
|
433,800,000
GBP
|
| Assets less current liabilities [abstract] |