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 |
33,700,000
GBP
|
22,900,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
52,800,000
GBP
|
41,900,000
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
2,900,000
GBP
|
—
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
17,300,000
GBP
|
14,400,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
103,700,000
GBP
|
92,500,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
18,200,000
GBP
|
8,200,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
1,290,900,000
GBP
|
379,100,000
GBP
|
229,800,000
GBP
|
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
368,000,000
GBP
|
285,300,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
9,300,000
GBP
|
7,100,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
1,386,700,000
GBP
|
1,135,700,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
11,600,000
GBP
|
3,100,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Reserve of share-based payments |
161,200,000
GBP
|
153,300,000
GBP
|
— |
| Merger reserve |
1,288,500,000
GBP
|
1,153,500,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1,570,000,000
GBP
|
608,700,000
GBP
|
— |
| Liabilities |
496,300,000
GBP
|
433,600,000
GBP
|
— |
| Assets (liabilities) |
1,073,700,000
GBP
|
175,100,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
1,412,800,000
GBP
|
479,800,000
GBP
|
— |
| Current liabilities |
378,200,000
GBP
|
292,600,000
GBP
|
— |
| Assets less current liabilities [abstract] |