Statement Of Changes In Equity [Abstract]

Just Group PLC - Filing #1591571

Concept	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	9 7 7. 0 GBP	—	—	2,440,000,000 GBP	—	348 .4 GBP	2,800,000 GBP	—	5 9 7. 1 GBP	32 2. 4 GBP	4 . 3 GBP	—	—	—	—	103. 9 GBP	94,600,000 GBP	2 , 119. 5 GBP	1. 9 GBP	—	—	—	1,056 .6 GBP	1 .9 GBP	—	2 ,19 8 . 3 GBP	103 . 8 GBP	—	—	—	5 9 7. 1 GBP	94. 5 GBP	—	—	5 .4 GBP	3. 3 GBP	348 .4 GBP	294. 0 GBP	2 , 490 . 4 GBP	—	—	—	—	2 , 0 2 7. 8 GBP	0. 8 GBP	94. 5 GBP	597 .1 GBP	2, 321 . 0 GBP	885 .9 GBP	294 .0 GBP	10 3. 5 GBP	34 8.4 GBP	4,400,000 GBP	6 .0 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	0. 8 GBP	—	– GBP	15. 0 GBP	—	– GBP	—	—	– GBP	—	—	—	– GBP	– GBP	– GBP	– GBP	—	—	—	—	15,800,000 GBP	1 5.0 GBP	192 . 5 GBP	—	—	– GBP	—	—	– GBP	– GBP	193 .6 GBP	—	—	– GBP	– GBP	—	—	—	—	—	1 .1 GBP	– GBP	– GBP	1 93. 6 GBP	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	– GBP	—	– GBP	600,000 GBP	—	– GBP	—	—	– GBP	—	—	—	0. 5 GBP	– GBP	– GBP	– GBP	—	—	—	—	600,000 GBP	100,000 GBP	1 .7 GBP	—	—	1 .1 GBP	—	—	– GBP	– GBP	600,000 GBP	—	—	– GBP	– GBP	—	—	—	—	—	– GBP	– GBP	– GBP	1,700,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	0. 8 GBP	—	– GBP	15. 6 GBP	—	– GBP	—	—	– GBP	—	—	—	0. 5 GBP	– GBP	– GBP	– GBP	—	—	—	—	16 . 4 GBP	15. 1 GBP	190 .8 GBP	—	—	1 .1 GBP	—	—	– GBP	– GBP	193 . 0 GBP	—	—	– GBP	– GBP	—	—	—	—	—	1,100,000 GBP	– GBP	– GBP	191. 9 GBP	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	– GBP	– GBP	—	– GBP	—	—	– GBP	—	—	—	– GBP	– GBP	– GBP	– GBP	—	—	—	—	– GBP	– GBP	0 .1 GBP	—	—	– GBP	—	—	– GBP	– GBP	100,000 GBP	—	—	– GBP	– GBP	—	—	—	—	—	– GBP	– GBP	– GBP	0 .1 GBP	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	800,000 GBP	—	– GBP	0. 8 GBP	—	– GBP	—	—	– GBP	—	—	—	– GBP	– GBP	– GBP	– GBP	—	—	—	—	– GBP	0. 8 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	—	– GBP	4,800,000 GBP	—	– GBP	—	—	– GBP	—	—	—	– GBP	1 .1 GBP	– GBP	– GBP	—	—	—	—	4,800,000 GBP	3,700,000 GBP	6,500,000 GBP	—	—	– GBP	—	—	– GBP	600,000 GBP	5,900,000 GBP	—	—	– GBP	– GBP	—	—	—	—	—	– GBP	– GBP	– GBP	6,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) in equity	– GBP	—	– GBP	62 . 4 GBP	—	100,000 GBP	—	—	28 . 4 GBP	—	—	—	– GBP	1,100,000 GBP	– GBP	100,000 GBP	—	—	—	—	34. 0 GBP	63,700,000 GBP	21,400,000 GBP	—	—	– GBP	—	—	– GBP	600,000 GBP	22. 3 GBP	—	—	– GBP	300,000 GBP	—	—	—	—	—	– GBP	– GBP	– GBP	21,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—