Statement Of Changes In Equity [Abstract]

Admiral Group PLC - Filing #1610882

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	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	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	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 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	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
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	1,348,800,000 GBP	—	—	1,408 .5 GBP	—	3,000,000 GBP	3 6 .7 GBP	—	—	1,406 .2 GBP	1 3.1 GBP	—	4,300,000 GBP	300,000 GBP	2,300,000 GBP	—	—	—	1,0 04.4 GBP	1 0.7 GBP	3 .6 GBP	1,112,700,000 GBP	300,000 GBP	—	—	—	13,100,000 GBP	13 .1 GBP	—	1,123,400,000 GBP	—	—	85,400,000 GBP	—	—	909,400,000 GBP	9,200,000 GBP	9 .7 GBP	918,600,000 GBP	13,100,000 GBP	84 0.9 GBP	46,600,000 GBP	1 . 2 GBP	300,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	1 . 2 GBP	—	– GBP	9 97. 9 GBP	—	– GBP	—	—	– GBP	– GBP	—	—	– GBP	—	—	—	9 9 6 .7 GBP	9 97. 9 GBP	5 27. 8 GBP	—	—	—	—	—	528. 8 GBP	– GBP	– GBP	—	—	– GBP	—	– GBP	1 .0 GBP	—	– GBP	528. 8 GBP	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	52 .5 GBP	—	39,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	1 . 5 GBP	—	6,600,000 GBP	9 45 .7 GBP	—	– GBP	—	—	1 0 . 1 GBP	4 8 .7 GBP	—	—	– GBP	—	—	—	94 4.2 GBP	9 97. 9 GBP	5 6 7.7 GBP	—	—	—	—	—	528,800,000 GBP	38. 8 GBP	2 .4 GBP	—	—	– GBP	—	3,400,000 GBP	0 . 9 GBP	—	– GBP	568,600,000 GBP	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	– GBP	720,900,000 GBP	—	– GBP	—	—	– GBP	– GBP	—	—	– GBP	—	—	—	720,900,000 GBP	720,900,000 GBP	4 25 .7 GBP	—	—	—	—	—	4 2 5 .7 GBP	– GBP	– GBP	—	—	– GBP	—	– GBP	– GBP	—	– GBP	4 2 5 .7 GBP	—	—	—	—	—	—	—	—	—
Increase through other contributions by owners, equity	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2,200,000 GBP	—	—	—	—	—	– GBP	– GBP	– GBP	—	—	– GBP	—	– GBP	2. 2 GBP	—	– GBP	– GBP	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	0. 3 GBP	—	– GBP	0. 3 GBP	—	– GBP	—	—	– GBP	– GBP	—	—	– GBP	—	—	—	– GBP	300,000 GBP	200,000 GBP	—	—	—	—	—	– GBP	– GBP	– GBP	—	—	– GBP	—	– GBP	0. 2 GBP	—	– GBP	– GBP	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	—	– GBP	63 .1 GBP	—	– GBP	—	—	– GBP	– GBP	—	—	– GBP	—	—	—	63 .1 GBP	63,100,000 GBP	53 .8 GBP	—	—	—	—	—	53. 8 GBP	– GBP	– GBP	—	—	– GBP	—	– GBP	– GBP	—	– GBP	53. 8 GBP	—	—	—	—	—	—	—	—	—