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 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 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
964,500,000
GBP
|
— | — | — | — | — |
988,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
96,900,000
GBP
|
— | — | — | — | — |
87,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
3,400,000
GBP
|
— | — | — | — | — |
3,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
10,300,000
GBP
|
— | — | — | — | — |
13,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
2,451,500,000
GBP
|
— | — | — | — | — |
2,399,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Current inventories |
464,000,000
GBP
|
— | — | — | — | — |
443,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
375,800,000
GBP
|
— | — | — | — | — |
337,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
320,600,000
GBP
|
— | — | — | — | — |
112,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets |
1,160,400,000
GBP
|
— | — | — | — | — |
893,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
15,100,000
GBP
|
— | — | — | — | — |
16,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium |
707,700,000
GBP
|
— | — | — | — | — |
707,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
1,692,800,000
GBP
|
— | — | — | — | — |
1,029,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
2,415,600,000
GBP
|
— | — | — | — | — |
1,753,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
15,500,000
GBP
|
— | — | — | — | — |
12,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
2,431,100,000
GBP
|
15,500,000
GBP
|
707,700,000
GBP
|
1,645,700,000
GBP
|
15,100,000
GBP
|
47,100,000
GBP
|
1,765,900,000
GBP
|
1,073,000,000
GBP
|
43,800,000
GBP
|
707,700,000
GBP
|
12,800,000
GBP
|
16,200,000
GBP
|
1,595,100,000
GBP
|
842,600,000
GBP
|
9,300,000
GBP
|
16,200,000
GBP
|
19,300,000
GBP
|
707,700,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions |
11,500,000
GBP
|
— | — | — | — | — |
3,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
172,900,000
GBP
|
— | — | — | — | — |
151,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
693,000,000
GBP
|
— | — | — | — | — |
1,067,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions |
6,100,000
GBP
|
— | — | — | — | — |
5,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
320,000,000
GBP
|
— | — | — | — | — |
358,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
487,800,000
GBP
|
— | — | — | — | — |
459,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |