Statement Of Cash Flows [Abstract]
| Concept |
As at 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
12,300,000
GBP
|
— |
99,700,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
1,500,000
GBP
|
— |
4,700,000
GBP
|
| Cash flows from (used in) operating activities | — |
10,800,000
GBP
|
— |
95,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
162,800,000
GBP
|
— |
–
GBP
|
| Cash payments for futures contracts, forward contracts, option contracts and swap contracts, classified as investing activities | — |
–
GBP
|
— |
3,800,000
GBP
|
| Cash flows from (used in) investing activities | — |
928,900,000
GBP
|
— |
320,000,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares | — |
9,800,000
GBP
|
— |
60,200,000
GBP
|
| Payments of lease liabilities, classified as financing activities | — |
15,400,000
GBP
|
— |
6,600,000
GBP
|
| Interest paid, classified as financing activities | — |
14,200,000
GBP
|
— |
7,200,000
GBP
|
| Cash flows from (used in) financing activities | — |
776,100,000
GBP
|
— |
325,600,000
GBP
|
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
142,000,000
GBP
|
— |
100,600,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
13,000,000
GBP
|
— |
6,400,000
GBP
|
| Cash and cash equivalents |
90,800,000
GBP
|
— |
238,800,000
GBP
|
— |