Statement Of Financial Position [Abstract]
| Concept |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
As at 2021-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||
| Property, plant and equipment |
384,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
277,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
67,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
62,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill |
703,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
411,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill |
500,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
255,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
69,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
46,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, non-current |
5,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
1,731,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,059,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||
| Current inventories |
290,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
201,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, current |
13,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
10,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
328,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
274,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets |
1,053,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
803,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
2,784,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,863,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||
| Issued capital |
19,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
1,067,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
961,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
88,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
86,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
23,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
1,169,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,009,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
1,169,800,000
GBP
|
23,400,000
GBP
|
800,000
GBP
|
88,100,000
GBP
|
1,067,000,000
GBP
|
19,800,000
GBP
|
17,500,000
GBP
|
1,169,000,000
GBP
|
40,500,000
GBP
|
1,009,000,000
GBP
|
961,100,000
GBP
|
86,300,000
GBP
|
19,800,000
GBP
|
1,000,000
GBP
|
1,010,000,000
GBP
|
17,700,000
GBP
|
961,100,000
GBP
|
17,700,000
GBP
|
1,010,000,000
GBP
|
1,009,000,000
GBP
|
86,300,000
GBP
|
1,000,000
GBP
|
40,500,000
GBP
|
19,800,000
GBP
|
33,700,000
GBP
|
19,800,000
GBP
|
852,300,000
GBP
|
782,800,000
GBP
|
2,400,000
GBP
|
84,800,000
GBP
|
851,300,000
GBP
|
1,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||||
| Other non-current provisions |
6,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
128,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
81,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
977,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
471,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||||
| Other current provisions |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
283,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
217,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current |
40,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
33,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
637,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
381,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
1,615,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
853,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
2,784,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,863,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |