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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 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] | |||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
1,635,300,000
GBP
|
1,631,500,000
GBP
|
3,800,000
GBP
|
399,300,000
GBP
|
1,236,000,000
GBP
|
1,631,500,000
GBP
|
–
GBP
|
–
GBP
|
10,300,000
GBP
|
–
GBP
|
77,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
177,900,000
GBP
|
266,100,000
GBP
|
–
GBP
|
88,200,000
GBP
|
77,900,000
GBP
|
— |
| 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
|