Profit Or Loss [Abstract]

Direct Line Insurance Group PLC - Filing #2024748

Concept	2023-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	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	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31
Profit or loss [abstract]
Profit (loss) [abstract]
Revenue	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Interest revenue calculated using effective interest method	171,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	109,300,000 GBP	—	—	—	—	—	—	—
Insurance revenue	3,601,700,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	3,229,100,000 GBP	—	—	—	—	—	—	—
Other income	21,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	8,300,000 GBP	—	—	—	—	—	—	—
Impairment loss (reversal of impairment loss) recognised in profit or loss	700,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	600,000 GBP	—	—	—	—	—	—	—
Insurance service expenses from insurance contracts issued	3,806,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	3,145,500,000 GBP	—	—	—	—	—	—	—
Finance costs	14,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	20,400,000 GBP	—	—	—	—	—	—	—
Insurance finance income (expenses) from insurance contracts issued recognised in profit or loss	193,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	102,400,000 GBP	—	—	—	—	—	—	—
Finance income (expenses) from reinsurance contracts held recognised in profit or loss	28,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	101,500,000 GBP	—	—	—	—	—	—	—
Profit (loss) before tax	277,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	301,800,000 GBP	—	—	—	—	—	—	—
Tax expense (income)	54,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	69,900,000 GBP	—	—	—	—	—	—	—
Profit (loss)	—	— GBP	222,900,000 GBP	222,900,000 GBP	— GBP	— GBP	— GBP	— GBP	— GBP	— GBP	222,900,000 GBP	— GBP	— GBP	231,900,000 GBP	231,900,000 GBP	— GBP	— GBP	— GBP	— GBP	231,900,000 GBP	— GBP
Profit (loss), attributable to [abstract]
Profit (loss), attributable to owners of parent	222,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	231,900,000 GBP	—	—	—	—	—	—	—
Earnings per share [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Earnings per share [abstract]
Earnings per share [line items]
Basic earnings per share [abstract]
Basic earnings (loss) per share	0.159	—	—	—	—	—	—	—	—	—	—	—	—	0.191	—	—	—	—	—	—	—
Diluted earnings per share [abstract]
Diluted earnings (loss) per share	0.157	—	—	—	—	—	—	—	—	—	—	—	—	0.191	—	—	—	—	—	—	—