Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||
| Cash flows from (used in) operating activities [abstract] | ||||||
| Profit (loss) | — |
474,400,000
GBP
|
474,400,000
GBP
|
— |
442,800,000
GBP
|
442 .8
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||
| Other adjustments for non-cash items | — |
15,900,000
GBP
|
— | — |
4,400,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
173,600,000
GBP
|
— | — |
181. 4
GBP
|
— |
| Cash flows from (used in) operating activities | — |
951,600,000
GBP
|
— | — |
733,100,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
49,900,000
GBP
|
— | — |
–
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
243,600,000
GBP
|
— | — |
436. 7
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
1,000,000
GBP
|
— | — |
2,700,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
46,700,000
GBP
|
— | — |
32. 7
GBP
|
— |
| Interest received, classified as investing activities | — |
16,200,000
GBP
|
— | — |
8,700,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
223,200,000
GBP
|
— | — |
458. 0
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||
| Payments to acquire or redeem entity's shares | — |
74,000,000
GBP
|
— | — |
34. 2
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
346,400,000
GBP
|
— | — |
14,500,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
131,800,000
GBP
|
— | — |
134. 9
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
175,100,000
GBP
|
— | — |
158,900,000
GBP
|
— |
| Dividends paid, classified as financing activities | — |
190,500,000
GBP
|
— | — |
180. 4
GBP
|
— |
| Interest paid, classified as financing activities | — |
61,900,000
GBP
|
— | — |
43. 5
GBP
|
— |
| Cash flows from (used in) financing activities | — |
331,000,000
GBP
|
— | — |
458. 7
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
397,400,000
GBP
|
— | — |
183,600,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
55,400,000
GBP
|
— | — |
20. 8
GBP
|
— |
| Cash and cash equivalents |
1,504,000,000
GBP
|
— | — |
776 .9
GBP
|
— | — |