Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||
| Cash flows from (used in) operating activities [abstract] | ||||||
| Cash flows from (used in) operations | — |
132,400,000
GBP
|
— |
179,800,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
6,800,000
GBP
|
— |
9,000,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
127,100,000
GBP
|
— |
178,900,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | ||||||
| Purchase of property, plant and equipment, classified as investing activities | — |
58,600,000
GBP
|
— |
40,700,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
228,300,000
GBP
|
— |
144,000,000
GBP
|
— | — |
| Cash advances and loans made to other parties, classified as investing activities | — |
–
GBP
|
— |
1,400,000
GBP
|
— | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | — |
–
GBP
|
— |
900,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
2,200,000
GBP
|
— |
1,100,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
284,700,000
GBP
|
— |
184,100,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | ||||||
| Proceeds from issuing shares | — |
653,900,000
GBP
|
— |
–
GBP
|
— | — |
| Proceeds from issuing other equity instruments | — |
–
GBP
|
— |
15,300,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — |
172,700,000
GBP
|
— |
37,300,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
10,000,000
GBP
|
— |
9,900,000
GBP
|
— | — |
| Interest paid, classified as financing activities | — |
141,200,000
GBP
|
— |
118,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
315,000,000
GBP
|
— |
66,500,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
157,400,000
GBP
|
— |
71,700,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
7,000,000
GBP
|
— |
1,200,000
GBP
|
— | — |
| Cash and cash equivalents |
583,300,000
GBP
|
— |
418,900,000
GBP
|
— |
418,900,000
GBP
|
489,400,000
GBP
|