Statement Of Cash Flows [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations |
75,000,000
GBP
|
— |
138,800,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities |
20,300,000
GBP
|
— |
28,300,000
GBP
|
— |
| Cash flows from (used in) operating activities |
54,700,000
GBP
|
— |
110,500,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Proceeds from sales of property, plant and equipment, classified as investing activities |
600,000
GBP
|
— |
1,400,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities |
10,500,000
GBP
|
— |
6,700,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities |
1,300,000
GBP
|
— |
1,300,000
GBP
|
— |
| Interest received, classified as investing activities |
1,800,000
GBP
|
— |
600,000
GBP
|
— |
| Cash flows from (used in) investing activities |
8,300,000
GBP
|
— |
4,500,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares |
15,700,000
GBP
|
— |
33,600,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities |
400,000
GBP
|
— |
–
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
17,200,000
GBP
|
— |
15,200,000
GBP
|
— |
| Dividends paid, classified as financing activities |
43,500,000
GBP
|
— |
32,300,000
GBP
|
— |
| Interest paid, classified as financing activities |
1,800,000
GBP
|
— |
1,700,000
GBP
|
— |
| Cash flows from (used in) financing activities |
66,800,000
GBP
|
— |
80,800,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
3,800,000
GBP
|
— |
25,200,000
GBP
|
— |
| Cash and cash equivalents | — |
431,700,000
GBP
|
— |
468,600,000
GBP
|