Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
1,044,000,000
GBP
|
964,500,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
1,408,500,000
GBP
|
1,253,200,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
1,900,000
GBP
|
3,400,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
113,500,000
GBP
|
123,200,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
395,700,000
GBP
|
375,800,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
341,200,000
GBP
|
464,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Cash |
172,500,000
GBP
|
320,600,000
GBP
|
| Cash and cash equivalents |
172,500,000
GBP
|
320,600,000
GBP
|
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
1,100,000
GBP
|
4,500,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
252,000,000
GBP
|
320,000,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
26,800,000
GBP
|
23,100,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
15,100,000
GBP
|
15,100,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets (liabilities) |
2,368,100,000
GBP
|
2,431,100,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
909,400,000
GBP
|
1,160,400,000
GBP
|
| Current liabilities |
320,200,000
GBP
|
487,800,000
GBP
|
| Current assets (liabilities) |
589,200,000
GBP
|
672,600,000
GBP
|
| Assets less current liabilities [abstract] |