Statement Of Cash Flows [Abstract]
| Concept |
2021-07-01 to 2022-06-30 |
As at 2022-06-30 |
2020-07-01 to 2021-06-30 |
As at 2021-06-30 |
As at 2020-06-30 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations |
182,100,000
GBP
|
— |
213,500,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities |
24,700,000
GBP
|
— |
64,300,000
GBP
|
— | — |
| Cash flows from (used in) operating activities |
157,400,000
GBP
|
— |
149,200,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities |
500,000
GBP
|
— |
0 .7
GBP
|
— | — |
| Interest received, classified as investing activities |
8,100,000
GBP
|
— |
3,200,000
GBP
|
— | — |
| Cash flows from (used in) investing activities |
70,300,000
GBP
|
— |
32,500,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares |
34,500,000
GBP
|
— |
23,300,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities |
2,000,000
GBP
|
— |
2 .1
GBP
|
— | — |
| Interest paid, classified as financing activities |
400,000
GBP
|
— |
0 .4
GBP
|
— | — |
| Cash flows from (used in) financing activities |
173,300,000
GBP
|
— |
121,000,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
54,400,000
GBP
|
— |
4,300,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents |
41,500,000
GBP
|
— |
40,500,000
GBP
|
— | — |
| Cash and cash equivalents | — |
552,000,000
GBP
|
— |
456,100,000
GBP
|
500,900,000
GBP
|