Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
245. 5
GBP
|
166,800,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
5 0. 3
GBP
|
46,800,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
195. 2
GBP
|
120,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
3,300,000
GBP
|
36 5.4
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
49. 5
GBP
|
1 14 .7
GBP
|
— |
| Interest received, classified as investing activities | — |
5,400,000
GBP
|
1,900,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
70 . 2
GBP
|
218 .2
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares | — |
114 . 9
GBP
|
191 .0
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
–
GBP
|
326 . 2
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
100,000
GBP
|
3 26. 8
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
15 . 4
GBP
|
13. 9
GBP
|
— |
| Dividends paid, classified as financing activities | — |
7 9.7
GBP
|
78. 6
GBP
|
— |
| Cash flows from (used in) financing activities | — |
21 0 .7
GBP
|
2 8 7. 8
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
8 5 .7
GBP
|
5 0.4
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
3 .6
GBP
|
9,900,000
GBP
|
— |
| Cash and cash equivalents |
138 . 5
GBP
|
— | — |
2 28 .1
GBP
|