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 |
355,500,000
GBP
|
389,600,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
1,384,100,000
GBP
|
1,336,800,000
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
2,100,000
GBP
|
900,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
243,400,000
GBP
|
177,900,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
196,800,000
GBP
|
207,400,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
418,900,000
GBP
|
489,400,000
GBP
|
107,900,000
GBP
|
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
1,074,900,000
GBP
|
971,300,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
114,300,000
GBP
|
113,500,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
9,800,000
GBP
|
7,500,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
721,000,000
GBP
|
578,900,000
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
78,700,000
GBP
|
92,500,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
11,600,000
GBP
|
11,500,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
662,400,000
GBP
|
5 03.1
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
2,700,000
GBP
|
400,000
GBP
|
— |
| Reserve of cash flow hedges |
6,700,000
GBP
|
10,900,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
9,300,000
GBP
|
9,300,000
GBP
|
— |
| Merger reserve |
143,900,000
GBP
|
144,000,000
GBP
|
— |
| Capital reserve |
6,600,000
GBP
|
6,600,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
2,842,500,000
GBP
|
2,794,800,000
GBP
|
— |
| Liabilities |
2,182,100,000
GBP
|
1,990,700,000
GBP
|
— |
| Assets (liabilities) |
660,400,000
GBP
|
804,100,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
867,900,000
GBP
|
889,500,000
GBP
|
— |
| Current liabilities |
905,200,000
GBP
|
808,300,000
GBP
|
— |
| Assets less current liabilities [abstract] |