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 | — |
163,000,000
GBP
|
— |
126,700,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
29,200,000
GBP
|
— |
30,300,000
GBP
|
| Cash flows from (used in) operating activities | — |
113,300,000
GBP
|
— |
78,500,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
5,400,000
GBP
|
— |
1,800,000
GBP
|
| Purchase of property, plant and equipment, classified as investing activities | — |
96,100,000
GBP
|
— |
60,400,000
GBP
|
| Interest received, classified as investing activities | — |
2,600,000
GBP
|
— |
3,900,000
GBP
|
| Cash flows from (used in) investing activities | — |
86,000,000
GBP
|
— |
60,200,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||||
| Proceeds from borrowings, classified as financing activities | — |
121,300,000
GBP
|
— |
247,200,000
GBP
|
| Repayments of borrowings, classified as financing activities | — |
88,000,000
GBP
|
— |
193,900,000
GBP
|
| Payments of lease liabilities, classified as financing activities | — |
10,600,000
GBP
|
— |
8,900,000
GBP
|
| Cash flows from (used in) financing activities | — |
33,000,000
GBP
|
— |
2,000,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
7,300,000
GBP
|
— |
9,500,000
GBP
|
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
5,700,000
GBP
|
— |
16,300,000
GBP
|
| Cash and cash equivalents |
120,800,000
GBP
|
— |
124,500,000
GBP
|
— |