Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-01-01 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
138,800,000
GBP
|
— |
197,600,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
28,300,000
GBP
|
— |
19,900,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
110,500,000
GBP
|
— |
177,700,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
— |
100,000
GBP
|
— |
| Other cash receipts from sales of interests in joint ventures, classified as investing activities | — |
–
GBP
|
— |
8,300,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
1,400,000
GBP
|
— |
1,400,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
6,700,000
GBP
|
— |
4,200,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
1,300,000
GBP
|
— |
1,600,000
GBP
|
— |
| Interest received, classified as investing activities | — |
600,000
GBP
|
— |
1,200,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
4,500,000
GBP
|
— |
7,400,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
33,600,000
GBP
|
— |
9,600,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
–
GBP
|
— |
180,400,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
–
GBP
|
— |
180,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
15,200,000
GBP
|
— |
15,100,000
GBP
|
— |
| Dividends paid, classified as financing activities | — |
32,300,000
GBP
|
— |
9,600,000
GBP
|
— |
| Interest paid, classified as financing activities | — |
1,700,000
GBP
|
— |
3,800,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
80,800,000
GBP
|
— |
29,800,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
25,200,000
GBP
|
— |
140,500,000
GBP
|
— |
| Cash and cash equivalents |
468,600,000
GBP
|
— |
400,500,000
GBP
|
— |
251,200,000
GBP
|