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 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
199,500,000
GBP
|
— |
134,300,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
20,600,000
GBP
|
— |
9,200,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
178,900,000
GBP
|
— |
125. 1
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
4,900,000
GBP
|
— |
–
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
700,000
GBP
|
— |
1,600,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
7 .6
GBP
|
— |
3,700,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
2,000,000
GBP
|
— |
2,900,000
GBP
|
— |
| Dividends received, classified as investing activities | — |
200,000
GBP
|
— |
–
GBP
|
— |
| Interest received, classified as investing activities | — |
1,300,000
GBP
|
— |
0. 2
GBP
|
— |
| Cash flows from (used in) investing activities | — |
5,400,000
GBP
|
— |
14,300,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — |
1,300,000
GBP
|
— |
–
GBP
|
— |
| Proceeds from issuing shares | — |
2,700,000
GBP
|
— |
1,800,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
600,000
GBP
|
— |
0 . 1
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
11,200,000
GBP
|
— |
9. 1
GBP
|
— |
| Interest paid, classified as financing activities | — |
2,200,000
GBP
|
— |
2,300,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
63,200,000
GBP
|
— |
51,200,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
110,300,000
GBP
|
— |
88,200,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
12,500,000
GBP
|
— |
–
GBP
|
— |
| Cash and cash equivalents |
384,400,000
GBP
|
— |
261,600,000
GBP
|
— |
173,400,000
GBP
|