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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
–
GBP
|
164,200,000
GBP
|
164,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
164,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
429,100,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
429,100,000
GBP
|
429,100,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||||||
| Other adjustments for non-cash items | — | — | — | — |
800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,300,000
GBP
|
— |
| Cash flows from (used in) operations | — | — | — | — |
31,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— |
| Interest paid, classified as operating activities | — | — | — | — |
69,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
101,400,000
GBP
|
— |
| Interest received, classified as operating activities | — | — | — | — |
18,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
20,500,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Cash flows from (used in) operating activities | — | — | — | — |
69,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
80,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||
| Other cash receipts from sales of interests in joint ventures, classified as investing activities | — | — | — | — |
67,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
48,500,000
GBP
|
— |
| Cash flows from (used in) investing activities | — | — | — | — |
154,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
11,400,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — | — |
6,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,500,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
596,500,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — | — | — | — |
302,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
929,400,000
GBP
|
— |
| Dividends paid, classified as financing activities | — | — | — | — |
13,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
24,900,000
GBP
|
— |
| Cash flows from (used in) financing activities | — | — | — | — |
322,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
363,700,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — |
99,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
100,300,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — |
2,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,100,000
GBP
|
— |
| Cash and cash equivalents |
218,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
315,100,000
GBP
|
— | — | — | — | — |