Disclosure Of Cash Flow Statement [Text Block]
| 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 |
As at 2020-01-01 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|
| Disclosure of cash flow statement [text block] | — | — | — | — | — | — |
| Cash and cash equivalents if different from statement of financial position [abstract] | ||||||
| Cash and cash equivalents |
468,600,000
GBP
|
— |
400,500,000
GBP
|
— |
251,200,000
GBP
|
— |
| Cash and cash equivalents if different from statement of financial position |
358,400,000
GBP
|
— |
333,200,000
GBP
|
— | — |
192,700,000
GBP
|
| Income taxes paid (refund) [abstract] | ||||||
| Income taxes paid (refund), classified as operating activities | — |
28,300,000
GBP
|
— |
19,900,000
GBP
|
— | — |