Statement Of Cash Flows [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operating activities |
800,200,000
GBP
|
— |
439,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Purchase of property, plant and equipment, classified as investing activities |
11,700,000
GBP
|
— |
29,300,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities |
108,400,000
GBP
|
— |
109,400,000
GBP
|
— |
| Cash flows from (used in) investing activities |
100,800,000
GBP
|
— |
138,700,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares |
50,100,000
GBP
|
— |
101,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
8,900,000
GBP
|
— |
101,900,000
GBP
|
— |
| Dividends paid, classified as financing activities |
297,900,000
GBP
|
— |
300,800,000
GBP
|
— |
| Cash flows from (used in) financing activities |
657,500,000
GBP
|
— |
572,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
41,900,000
GBP
|
— |
271,700,000
GBP
|
— |
| Cash and cash equivalents | — |
1,003,600,000
GBP
|
— |
955,700,000
GBP
|