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 | — |
479,000,000
GBP
|
— |
375,200,000
GBP
|
| Interest paid, classified as operating activities | — |
19,800,000
GBP
|
— |
17,500,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
111,500,000
GBP
|
— |
70,700,000
GBP
|
| Cash flows from (used in) operating activities | — |
347,700,000
GBP
|
— |
287,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
58,100,000
GBP
|
— |
868,200,000
GBP
|
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
200,000
GBP
|
— |
200,000
GBP
|
| Purchase of property, plant and equipment, classified as investing activities | — |
153,000,000
GBP
|
— |
115,000,000
GBP
|
| Purchase of intangible assets, classified as investing activities | — |
5,700,000
GBP
|
— |
6,200,000
GBP
|
| Interest received, classified as investing activities | — |
1,500,000
GBP
|
— |
500,000
GBP
|
| Cash flows from (used in) investing activities | — |
216,200,000
GBP
|
— |
991,900,000
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 | — |
700,000
GBP
|
— |
–
GBP
|
| Proceeds from issuing shares | — |
–
GBP
|
— |
615,500,000
GBP
|
| Proceeds from borrowings, classified as financing activities | — |
320,200,000
GBP
|
— |
438,700,000
GBP
|
| Repayments of borrowings, classified as financing activities | — |
282,600,000
GBP
|
— |
201,400,000
GBP
|
| Payments of lease liabilities, classified as financing activities | — |
14,400,000
GBP
|
— |
7,600,000
GBP
|
| Cash flows from (used in) financing activities | — |
112,600,000
GBP
|
— |
722,400,000
GBP
|
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
18,900,000
GBP
|
— |
17,500,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
2,400,000
GBP
|
— |
2,800,000
GBP
|
| Cash and cash equivalents |
112,800,000
GBP
|
— |
106,500,000
GBP
|
— |