Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Dividends recognised as distributions to owners of parent |
–
GBP
|
48,100,000
GBP
|
48,100,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
43,500,000
GBP
|
–
GBP
|
43,500,000
GBP
|
| Increase (decrease) through exercise of options, equity |
–
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
–
GBP
|
1,600,000
GBP
|
| Decrease (increase) through tax on share-based payment transactions, equity |
–
GBP
|
2,700,000
GBP
|
2,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3,300,000
GBP
|
–
GBP
|
3,300,000
GBP
|
| Purchase of treasury shares |
–
GBP
|
11,300,000
GBP
|
11,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
15,700,000
GBP
|
–
GBP
|
15,700,000
GBP
|