Statement Of Financial Position [Abstract]
| Concept |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — | — | — | — |
710,600,000
GBP
|
— | — | — | — |
734,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
840,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — | — | — | — | — |
334,300,000
GBP
|
— | — | — | — |
518,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
609,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill | — | — | — | — | — | — | — | — | — |
782,400,000
GBP
|
— | — | — | — |
956,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,381,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — | — | — | — | — | — | — |
175,700,000
GBP
|
— | — | — | — |
199,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
332,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — | — | — | — | — | — | — |
54,300,000
GBP
|
— | — | — | — |
73,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
161,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — | — | — | — | — | — | — |
9,700,000
GBP
|
— | — | — | — |
26,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
25,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — | — | — | — |
47,000,000
GBP
|
— | — | — | — |
129,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
69,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — | — | — | — |
2,461,100,000
GBP
|
— | — | — | — |
2,756,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,802,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Current inventories | — | — | — | — | — | — | — | — | — |
142,700,000
GBP
|
— | — | — | — |
153,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
191,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — | — | — | — | — | — | — |
488,800,000
GBP
|
— | — | — | — |
435,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
480,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — |
1,146,300,000
GBP
|
— | — | — | — |
904,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,845,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets | — | — | — | — | — | — | — | — | — |
2,137,200,000
GBP
|
— | — | — | — |
1,854,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,048,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — | — | — | — |
4,598,300,000
GBP
|
— | — | — | — |
4,610,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,851,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — | — | — | — |
303,400,000
GBP
|
— | — | — | — |
303,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
303,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — | — | — | — |
1,241,400,000
GBP
|
— | — | — | — |
1,671,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
488,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — | — | — | — |
873,000,000
GBP
|
— | — | — | — |
873,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
873,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — | — | — | — |
747,000,000
GBP
|
— | — | — | — |
708,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
670,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — | — | — | — |
682,000,000
GBP
|
— | — | — | — |
213,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,336,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — | — | — | — | — | — | — |
19,500,000
GBP
|
— | — | — | — |
16,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
15,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
30,600,000
GBP
|
682 .0
GBP
|
768,800,000
GBP
|
30,600,000
GBP
|
4,000,000
GBP
|
303,400,000
GBP
|
56,400,000
GBP
|
873,000,000
GBP
|
1,241,400,000
GBP
|
701,500,000
GBP
|
19,500,000
GBP
|
–
GBP
|
30,600,000
GBP
|
1,671,700,000
GBP
|
229,000,000
GBP
|
303,400,000
GBP
|
873,000,000
GBP
|
16,000,000
GBP
|
21 3.0
GBP
|
48,400,000
GBP
|
768,800,000
GBP
|
42,700,000
GBP
|
15,700,000
GBP
|
2,336,100,000
GBP
|
873,000,000
GBP
|
303,400,000
GBP
|
–
GBP
|
–
GBP
|
2 ,314.8
GBP
|
5 9.5
GBP
|
4 80.1
GBP
|
2 ,351.8
GBP
|
–
GBP
|
37,000,000
GBP
|
8,800,000
GBP
|
5 9.5
GBP
|
768,800,000
GBP
|
–
GBP
|
37,000,000
GBP
|
768,800,000
GBP
|
97,300,000
GBP
|
69,100,000
GBP
|
–
GBP
|
2,299,100,000
GBP
|
15,700,000
GBP
|
873,000,000
GBP
|
2 8.2
GBP
|
303,400,000
GBP
|
4 88.9
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current provisions | — | — | — | — | — | — | — | — | — |
60,300,000
GBP
|
— | — | — | — |
73,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
32,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
1,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — | — | — | — | — | — | — |
9,600,000
GBP
|
— | — | — | — |
7,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
33,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — | — | — | — | — | — |
1,416,500,000
GBP
|
— | — | — | — |
2,270,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,907,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Current provisions | — | — | — | — | — | — | — | — | — |
53,200,000
GBP
|
— | — | — | — |
71,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
130,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — | — | — | — | — | — | — | — |
888,100,000
GBP
|
— | — | — | — |
1,110,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,058,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — | — | — | — | — | — |
2,480,300,000
GBP
|
— | — | — | — |
2,111,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,591,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — | — | — | — |
3,896,800,000
GBP
|
— | — | — | — |
4,381,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,499,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — | — | — | — | — | — | — |
4,598,300,000
GBP
|
— | — | — | — |
4,610,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,851,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |