Statement Of Changes In Equity [Abstract]

Admiral Group PLC - Filing #1869190

Concept	As at 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	2022-01-01 to 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	2022-01-01 to 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	2022-01-01 to 2022-12-31	As at 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	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	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	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	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	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	955,400,000 GBP	—	—	—	—	—	1,200,000 GBP	13,100,000 GBP	1,114,500,000 GBP	300,000 GBP	—	11,100,000 GBP	954,200,000 GBP	205,900,000 GBP	—	21,100,000 GBP	—	—	—	1,348,800,000 GBP	—	—	1,408,500,000 GBP	—	3,000,000 GBP	36,700,000 GBP	4,300,000 GBP	—	—	1,406,200,000 GBP	—	13,100,000 GBP	300,000 GBP	2,300,000 GBP	—	—	1,004,400,000 GBP	10,700,000 GBP	3,600,000 GBP	1,112,700,000 GBP	300,000 GBP	13,100,000 GBP	13,100,000 GBP	1,123,400,000 GBP	85,400,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	– GBP	371,800,000 GBP	373,000,000 GBP	1,200,000 GBP	– GBP	—	—	—	—	– GBP	—	—	—	373,000,000 GBP	—	– GBP	– GBP	1,200,000 GBP	—	– GBP	997,900,000 GBP	—	– GBP	—	—	—	– GBP	– GBP	—	– GBP	—	—	—	996,700,000 GBP	997,900,000 GBP	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	217,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	52,500,000 GBP	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	– GBP	154,200,000 GBP	373,000,000 GBP	1,100,000 GBP	18,100,000 GBP	—	—	—	—	242,600,000 GBP	—	—	—	155,300,000 GBP	—	– GBP	6,800,000 GBP	1,500,000 GBP	—	6,600,000 GBP	945,700,000 GBP	—	– GBP	—	—	—	10,100,000 GBP	48,700,000 GBP	—	– GBP	—	—	—	944,200,000 GBP	997,900,000 GBP	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	– GBP	658,300,000 GBP	658,300,000 GBP	– GBP	– GBP	—	—	—	—	– GBP	—	—	—	658,300,000 GBP	—	– GBP	– GBP	– GBP	—	– GBP	720,900,000 GBP	—	– GBP	—	—	—	– GBP	– GBP	—	– GBP	—	—	—	720,900,000 GBP	720,900,000 GBP	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	—	– GBP	– GBP	– GBP	– GBP	– GBP	—	—	—	—	– GBP	—	—	—	– GBP	—	– GBP	– GBP	300,000 GBP	—	– GBP	300,000 GBP	—	– GBP	—	—	—	– GBP	– GBP	—	– GBP	—	—	—	– GBP	300,000 GBP	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	– GBP	57,300,000 GBP	57,300,000 GBP	– GBP	– GBP	—	—	—	—	– GBP	—	—	—	57,300,000 GBP	—	– GBP	– GBP	– GBP	—	– GBP	63,100,000 GBP	—	– GBP	—	—	—	– GBP	– GBP	—	– GBP	—	—	—	63,100,000 GBP	63,100,000 GBP	—	—	—	—	—	—	—	—	—