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] | ||||
| Income taxes paid (refund), classified as operating activities | — |
188,600,000
GBP
|
173,600,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
904,000,000
GBP
|
951,600,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
49,900,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
337,700,000
GBP
|
243,600,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
2,100,000
GBP
|
1,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
58,300,000
GBP
|
46,700,000
GBP
|
— |
| Interest received, classified as investing activities | — |
54,400,000
GBP
|
16,200,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
339,500,000
GBP
|
223,200,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares | — |
76,400,000
GBP
|
74,000,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
–
GBP
|
346,400,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
159,500,000
GBP
|
131,800,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
188,000,000
GBP
|
175,100,000
GBP
|
— |
| Dividends paid, classified as financing activities | — |
209,700,000
GBP
|
190,500,000
GBP
|
— |
| Interest paid, classified as financing activities | — |
107,600,000
GBP
|
61,900,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
666,900,000
GBP
|
331,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
102,400,000
GBP
|
397,400,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
23,800,000
GBP
|
55,400,000
GBP
|
— |
| Cash and cash equivalents |
1,426,100,000
GBP
|
— | — |
1,504,000,000
GBP
|