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 | — |
431,000,000
GBP
|
462,200,000
GBP
|
— |
| Interest paid, classified as operating activities | — |
24,200,000
GBP
|
23,200,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
69,300,000
GBP
|
130,800,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
337,500,000
GBP
|
308,200,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
204,300,000
GBP
|
–
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
4,000,000
GBP
|
1,700,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
180,400,000
GBP
|
141,200,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
8,600,000
GBP
|
11,200,000
GBP
|
— |
| Proceeds from government grants, classified as investing activities | — |
10,900,000
GBP
|
6,100,000
GBP
|
— |
| Interest received, classified as investing activities | — |
8,300,000
GBP
|
5,100,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
409,800,000
GBP
|
424,600,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — |
–
GBP
|
1,400,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
336,000,000
GBP
|
232,600,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
210,900,000
GBP
|
614,400,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
17,000,000
GBP
|
17,400,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
52,400,000
GBP
|
552,300,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
124,700,000
GBP
|
180,500,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
6,700,000
GBP
|
6,800,000
GBP
|
— |
| Cash and cash equivalents |
172,500,000
GBP
|
— | — |
320,600,000
GBP
|