Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
12,700,000
GBP
|
— |
15,000,000
GBP
|
| Interest paid, classified as operating activities | — |
101,400,000
GBP
|
— |
101,800,000
GBP
|
| Interest received, classified as operating activities | — |
20,500,000
GBP
|
— |
19,600,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
2,000,000
GBP
|
— |
800,000
GBP
|
| Cash flows from (used in) operating activities | — |
70,300,000
GBP
|
— |
82,400,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||
| Other cash receipts from sales of interests in joint ventures, classified as investing activities | — |
48,500,000
GBP
|
— |
272,000,000
GBP
|
| Cash flows from (used in) investing activities | — |
336,300,000
GBP
|
— |
253,100,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares | — |
3,500,000
GBP
|
— |
200,000
GBP
|
| Proceeds from borrowings, classified as financing activities | — |
596,500,000
GBP
|
— |
75,000,000
GBP
|
| Repayments of borrowings, classified as financing activities | — |
929,400,000
GBP
|
— |
385,800,000
GBP
|
| Dividends paid, classified as financing activities | — |
24,900,000
GBP
|
— |
13,400,000
GBP
|
| Cash flows from (used in) financing activities | — |
363,700,000
GBP
|
— |
207,500,000
GBP
|
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
97,700,000
GBP
|
— |
378,200,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
2,100,000
GBP
|
— |
1,500,000
GBP
|
| Cash and cash equivalents |
309,700,000
GBP
|
— |
409,500,000
GBP
|
— |