Analysis Of Income And Expense [Abstract]

Direct Line Insurance Group PLC - Filing #3490597

Concept	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	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	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	2020-01-01 to 2020-12-31
Analysis of income and expense [abstract]
Material income and expense [abstract]
Investment income	—	—	—	—	—	—	—	146,300,000 GBP	—	—	—	—	95,100,000 GBP	—	—	—	—	—
Miscellaneous other operating expense	—	—	—	—	—	—	—	807,800,000 GBP	—	—	—	—	763,800,000 GBP	—	—	—	—	—
Operating expense	—	—	—	—	—	—	—	1,048,700,000 GBP	—	—	—	—	1,018,500,000 GBP	—	—	—	—	—
Fee and commission income (expense) [abstract]
Fee and commission expense [abstract]
Fee and commission expense	—	—	—	—	—	—	—	240,900,000 GBP	—	—	—	—	254,700,000 GBP	—	—	—	—	—
Income tax relating to components of other comprehensive income [abstract]
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	—	—	—	—	—	—	—	17,100,000 GBP	—	—	—	—	9,900,000 GBP	—	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	74,900,000 GBP	— GBP	— GBP	— GBP	300,000 GBP	271,500,000 GBP	— GBP	271,500,000 GBP	346,700,000 GBP	367,100,000 GBP	— GBP	— GBP	403,400,000 GBP	36,400,000 GBP	100,000 GBP	403,400,000 GBP	— GBP	— GBP
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	271,500,000 GBP	—	—	—	—	403,400,000 GBP	—	—	—	—	—