Statement Of Changes In Equity [Abstract]

Derwent London PLC - Filing #2016614

Concept	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 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	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	2022-01-01 to 2022-12-31	As at 2022-12-31	2022-01-01 to 2022-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	196,600,000 GBP	—	3,508,800,000 GBP	—	2,367,300,000 GBP	939,300,000 GBP	—	—	196,600,000 GBP	304,100,000 GBP	—	5,600,000 GBP	—	926,200,000 GBP	—	—	—	5,600,000 GBP	—	1,432,500,000 GBP	4,075,500,000 GBP	—	—	—	—	—	—	—	—	941,900,000 GBP	202,200,000 GBP	196,600,000 GBP	2,931,400,000 GBP	5,600,000 GBP	196,600,000 GBP	925,900,000 GBP	1,330,300,000 GBP	—	5,600,000 GBP	—	3,299,700,000 GBP	941,100,000 GBP	5,600,000 GBP	195,400,000 GBP	925,600,000 GBP	255,700,000 GBP	4,441,800,000 GBP	195,400,000 GBP	5,600,000 GBP	1,382,300,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	476,400,000 GBP	—	– GBP	—	—	476,400,000 GBP	– GBP	—	—	– GBP	—	189,600,000 GBP	—	– GBP	– GBP	– GBP	—	189,600,000 GBP	—	—	– GBP	– GBP	280,500,000 GBP	280,500,000 GBP	– GBP	– GBP	– GBP	34,300,000 GBP	—	—	—	—	—	—	—	—	– GBP	—	34,300,000 GBP	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	3,600,000 GBP	—	2,900,000 GBP	—	—	700,000 GBP	– GBP	—	—	– GBP	—	700,000 GBP	—	– GBP	– GBP	– GBP	—	700,000 GBP	—	—	– GBP	500,000 GBP	1,500,000 GBP	2,000,000 GBP	– GBP	– GBP	– GBP	2,000,000 GBP	—	—	—	—	—	—	—	—	– GBP	—	2,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	480,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	282,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	88,700,000 GBP	—	– GBP	—	—	88,700,000 GBP	– GBP	—	—	– GBP	—	88,700,000 GBP	—	– GBP	– GBP	– GBP	—	88,700,000 GBP	—	—	– GBP	– GBP	87,000,000 GBP	87,000,000 GBP	– GBP	– GBP	– GBP	87,000,000 GBP	—	—	—	—	—	—	—	—	– GBP	—	87,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	2,000,000 GBP	—	300,000 GBP	—	—	1,700,000 GBP	– GBP	—	—	– GBP	—	1,700,000 GBP	—	300,000 GBP	– GBP	– GBP	—	2,000,000 GBP	—	—	– GBP	300,000 GBP	2,700,000 GBP	1,200,000 GBP	– GBP	1,200,000 GBP	300,000 GBP	1,200,000 GBP	—	—	—	—	—	—	—	—	1,200,000 GBP	—	2,700,000 GBP	—	—	—	—	—	—	—	—	—	—