Statement Of Cash Flows [Abstract]
| Concept |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
As at 2023-03-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operating activities | — |
492,400,000
GBP
|
385,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
5,900,000
GBP
|
1,600,000
GBP
|
— | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
116,200,000
GBP
|
238,800,000
GBP
|
— | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
900,000
GBP
|
1,600,000
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
43,800,000
GBP
|
32,800,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
4,900,000
GBP
|
1,200,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
163,900,000
GBP
|
286,300,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
7,900,000
GBP
|
21,100,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities | — |
38,900,000
GBP
|
513,200,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities | — |
337,000,000
GBP
|
465,700,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
24,200,000
GBP
|
20,900,000
GBP
|
— | — |
| Dividends paid, classified as financing activities | — |
83,800,000
GBP
|
78,200,000
GBP
|
— | — |
| Interest paid, classified as financing activities | — |
28,900,000
GBP
|
29,600,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
155,100,000
GBP
|
119,700,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
173,400,000
GBP
|
21,000,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
3,100,000
GBP
|
5,100,000
GBP
|
— | — |
| Cash and cash equivalents |
312,700,000
GBP
|
— | — |
142,400,000
GBP
|
168,500,000
GBP
|