Statement Of Changes In Equity [Abstract]

Derwent London PLC - Filing #3488061

Concept	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 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	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 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	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	3,299,700,000 GBP	941,100,000 GBP	—	—	—	4,441,800,000 GBP	—	—	1,382,300,000 GBP	925,600,000 GBP	– GBP	1,382,300,000 GBP	—	—	—	195,400,000 GBP	—	5,600,000 GBP	255,700,000 GBP	—	4,441,800,000 GBP	– GBP	—	195,400,000 GBP	5,600,000 GBP	—	—	—	3,124,500,000 GBP	51,900,000 GBP	—	4,263,200,000 GBP	5,600,000 GBP	—	—	—	—	—	—	1,446,800,000 GBP	—	– GBP	1,446,800,000 GBP	5,600,000 GBP	926,300,000 GBP	321,200,000 GBP	193,700,000 GBP	939,400,000 GBP	193,700,000 GBP	—	4,315,100,000 GBP	—	—	—	—	4,421,200,000 GBP	55,700,000 GBP	936,200,000 GBP	4,476,900,000 GBP	403,700,000 GBP	5,600,000 GBP	1,525,600,000 GBP	923,300,000 GBP	193,000,000 GBP	193,000,000 GBP	5,600,000 GBP	1,525,600,000 GBP	3,286,400,000 GBP	– GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	1,500,000 GBP	—	—	– GBP	252,300,000 GBP	– GBP	—	11,600,000 GBP	– GBP	—	—	—	—	– GBP	– GBP	– GBP	—	11,600,000 GBP	—	—	11,600,000 GBP	—	—	– GBP	—	—	253,800,000 GBP	252,300,000 GBP	81,400,000 GBP	—	—	1,800,000 GBP	—	—	– GBP	1,800,000 GBP	– GBP	– GBP	1,800,000 GBP	77,600,000 GBP	—	– GBP	—	—	—	—	—	—	—	—	– GBP	—	– GBP	3,800,000 GBP	– GBP	77,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	– GBP	—	—	2,400,000 GBP	4,700,000 GBP	– GBP	—	2,300,000 GBP	– GBP	—	—	—	—	– GBP	– GBP	– GBP	—	2,300,000 GBP	—	—	2,300,000 GBP	—	—	– GBP	—	—	4,700,000 GBP	2,300,000 GBP	3,500,000 GBP	—	—	3,700,000 GBP	—	—	– GBP	3,700,000 GBP	– GBP	– GBP	3,700,000 GBP	3,700,000 GBP	—	– GBP	—	—	—	—	—	—	—	—	200,000 GBP	—	– GBP	– GBP	– GBP	3,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	258,500,000 GBP	—	84,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	—	– GBP	84,600,000 GBP	– GBP	—	84,600,000 GBP	– GBP	—	—	—	—	– GBP	– GBP	– GBP	—	84,600,000 GBP	—	—	84,600,000 GBP	—	—	– GBP	—	—	84,600,000 GBP	84,600,000 GBP	82,200,000 GBP	—	—	82,200,000 GBP	—	—	– GBP	82,200,000 GBP	– GBP	– GBP	82,200,000 GBP	82,200,000 GBP	—	– GBP	—	—	—	—	—	—	—	—	– GBP	—	– GBP	– GBP	– GBP	82,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	—	—	700,000 GBP	6,200,000 GBP	– GBP	—	5,200,000 GBP	1,700,000 GBP	—	—	—	—	– GBP	700,000 GBP	1,700,000 GBP	—	6,200,000 GBP	—	—	6,200,000 GBP	—	—	– GBP	—	—	6,200,000 GBP	5,200,000 GBP	5,300,000 GBP	—	—	5,300,000 GBP	—	—	700,000 GBP	1,600,000 GBP	– GBP	3,000,000 GBP	5,300,000 GBP	1,600,000 GBP	—	– GBP	—	—	—	—	—	—	—	—	3,000,000 GBP	—	– GBP	– GBP	700,000 GBP	5,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—