Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations |
65,600,000
GBP
|
— | — |
566,300,000
GBP
|
— |
| Dividends received, classified as operating activities |
—
GBP
|
— | — |
—
GBP
|
— |
| Interest paid, classified as operating activities |
4,300,000
GBP
|
— | — |
3,300,000
GBP
|
— |
| Interest received, classified as operating activities |
11 . 7
GBP
|
— | — |
3,500,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities |
7 1 .6
GBP
|
— | — |
1 64.2
GBP
|
— |
| Cash flows from (used in) operating activities |
1 29.8
GBP
|
— | — |
402,300,000
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
|
— | — |
200,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities |
1. 0
GBP
|
— | — |
900,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities |
36,400,000
GBP
|
— | — |
30,500,000
GBP
|
— |
| Cash flows from (used in) investing activities |
42,900,000
GBP
|
— | — |
2 9.8
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares |
1 .2
GBP
|
— | — |
700,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
3,000,000
GBP
|
— | — |
3,300,000
GBP
|
— |
| Dividends paid, classified as financing activities |
255,400,000
GBP
|
— | — |
7 50.1
GBP
|
— |
| Cash flows from (used in) financing activities |
268,800,000
GBP
|
— | — |
7 5 7 .5
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
44 1 .5
GBP
|
— | — |
385,000,000
GBP
|
— |
| Cash and cash equivalents | — |
420,100,000
GBP
|
86 1 .6
GBP
|
— |
1 ,2 46.6
GBP
|