Statement Of Comprehensive Income [Abstract]

Direct Line Insurance Group PLC - Filing #3490494

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 comprehensive income [abstract]
Profit (loss)	— GBP	— GBP	39,500,000 GBP	39,500,000 GBP	39,500,000 GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	343,700,000 GBP	— GBP	343,700,000 GBP	343,700,000 GBP
Other comprehensive income [abstract]
Other comprehensive income that will not be reclassified to profit or loss, net of tax	—	—	—	7,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	3,000,000 GBP	—
Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]
Available-for-sale financial assets [abstract]
Gains (losses) on remeasuring available-for-sale financial assets, net of tax	—	—	—	295,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	84,100,000 GBP	—
Reclassification adjustments on available-for-sale financial assets, net of tax	—	—	—	24,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	7,900,000 GBP	—
Other comprehensive income that will be reclassified to profit or loss, net of tax	—	—	—	203,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	75,200,000 GBP	—
Other comprehensive income	— GBP	— GBP	210,800,000 GBP	210,800,000 GBP	7,300,000 GBP	— GBP	203,700,000 GBP	— GBP	200,000 GBP	74,900,000 GBP	300,000 GBP	— GBP	— GBP	— GBP	72,200,000 GBP	— GBP	72,200,000 GBP	3,000,000 GBP
Comprehensive income	— GBP	— GBP	250,300,000 GBP	250,300,000 GBP	46,800,000 GBP	— GBP	203,700,000 GBP	— GBP	200,000 GBP	74,900,000 GBP	300,000 GBP	— GBP	— GBP	— GBP	271,500,000 GBP	— GBP	271,500,000 GBP	346,700,000 GBP
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	250,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	271,500,000 GBP	—