Profit Or Loss [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
Profit or loss [abstract]
Profit (loss) [abstract]
Other income	—	—	—	—	—	—	—	46,700,000 GBP	—	—	—	—	49,900,000 GBP	—	—	—	—	—
Finance costs	—	—	—	—	—	—	—	34,300,000 GBP	—	—	—	—	31,300,000 GBP	—	—	—	—	—
Profit (loss) before tax	—	—	—	—	—	—	—	446,000,000 GBP	—	—	—	—	451,400,000 GBP	—	—	—	—	—
Tax expense (income)	—	—	—	—	—	—	—	102,300,000 GBP	—	—	—	—	84,200,000 GBP	—	—	—	—	—
Profit (loss)	— GBP	— GBP	— GBP	— GBP	— GBP	343,700,000 GBP	— GBP	343,700,000 GBP	343,700,000 GBP	367,200,000 GBP	— GBP	— GBP	367,200,000 GBP	— GBP	— GBP	367,200,000 GBP	— GBP	— GBP
Profit (loss), attributable to [abstract]
Profit (loss), attributable to owners of parent	—	—	—	—	—	—	—	343,700,000 GBP	—	—	—	—	367,200,000 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	—	—	—	—	—	—	—	0.245	—	—	—	—	0.258	—	—	—	—	—
Diluted earnings per share [abstract]
Diluted earnings (loss) per share	—	—	—	—	—	—	—	0.241	—	—	—	—	0.255	—	—	—	—	—