Statement Of Changes In Equity [Abstract]

Admiral Group PLC - Filing #1869191

Concept	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	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	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	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	2021-01-01 to 2021-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Decrease (increase) through tax on share-based payment transactions, equity	– GBP	6,300,000 GBP	– GBP	6,300,000 GBP	– GBP	– GBP	6,300,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	6,000,000 GBP	6,000,000 GBP	6,000,000 GBP
Increase (decrease) through transactions with owners, equity	– GBP	607,300,000 GBP	– GBP	607,300,000 GBP	– GBP	– GBP	607,300,000 GBP	– GBP	– GBP	6,900,000 GBP	– GBP	– GBP	– GBP	– GBP	1,300,000 GBP	652,200,000 GBP	659,100,000 GBP	653,500,000 GBP