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 2019-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
191. 6
GBP
|
— |
2 54 .6
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
32 . 2
GBP
|
— |
28,600,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
159. 4
GBP
|
— |
226 .0
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
333,700,000
GBP
|
— |
20,600,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
135 . 5
GBP
|
— |
10,900,000
GBP
|
— |
| Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities | — |
38. 3
GBP
|
— |
–
GBP
|
— |
| Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities | — |
–
GBP
|
— |
1 5 . 2
GBP
|
— |
| Proceeds from government grants, classified as investing activities | — |
–
GBP
|
— |
0. 2
GBP
|
— |
| Interest received, classified as investing activities | — |
0. 5
GBP
|
— |
2,400,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
201 . 8
GBP
|
— |
41 . 9
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
201 . 3
GBP
|
— |
–
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
70. 0
GBP
|
— |
0. 3
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
1 69. 8
GBP
|
— |
86 .4
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
13 .0
GBP
|
— |
19. 3
GBP
|
— |
| Dividends paid, classified as financing activities | — |
79. 0
GBP
|
— |
7 5 .7
GBP
|
— |
| Cash flows from (used in) financing activities | — |
3 98 .0
GBP
|
— |
1 8 7. 0
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
36 . 8
GBP
|
— |
2. 9
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
6 . 3
GBP
|
— |
0 .7
GBP
|
— |
| Cash and cash equivalents |
167 .8
GBP
|
— |
222,200,000
GBP
|
— |
213 .1
GBP
|