Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
560,000,000
GBP
|
— |
507,500,000
GBP
|
— |
| Interest paid, classified as operating activities | — |
91,100,000
GBP
|
— |
80,000,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
450,900,000
GBP
|
— |
471,600,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
2,800,000
GBP
|
— |
280,900,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
315,100,000
GBP
|
— |
68,200,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
14,500,000
GBP
|
— |
6,900,000
GBP
|
— |
| Dividends received, classified as investing activities | — |
1,800,000
GBP
|
— |
2,800,000
GBP
|
— |
| Interest received, classified as investing activities | — |
25,700,000
GBP
|
— |
5,600,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
1,522,800,000
GBP
|
— |
161,400,000
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 | — |
1,500,000
GBP
|
— |
1,500,000
GBP
|
— |
| Payments to acquire or redeem entity's shares | — |
–
GBP
|
— |
200,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
32,100,000
GBP
|
— |
35,600,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
815,300,000
GBP
|
— |
47,100,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
1,158,400,000
GBP
|
— |
585,900,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
82,600,000
GBP
|
— |
500,000
GBP
|
— |
| Cash and cash equivalents |
2,125,800,000
GBP
|
— |
884,800,000
GBP
|
— |
299,400,000
GBP
|