Statement Of Changes In Equity [Abstract]

Hammerson PLC - Filing #1587226

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	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	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	As at 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	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	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	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	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	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	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
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	3,500,000 GBP	243,500,000 GBP	—	—	207,600,000 GBP	—	—	—	2,746,000,000 GBP	—	1,700,000 GBP	—	362,800,000 GBP	—	374,100,000 GBP	2,745,900,000 GBP	1,593,200,000 GBP	—	471,100,000 GBP	221,000,000 GBP	100,000 GBP	—	—	—	663,000,000 GBP	100,000 GBP	3,400,000 GBP	—	202,900,000 GBP	3,208,800,000 GBP	—	—	374,100,000 GBP	—	400,000 GBP	666,000,000 GBP	207,100,000 GBP	1,611 .9 GBP	—	—	3,208,900,000 GBP	—	—	—	519,200,000 GBP	—	—	4,377 .0 GBP	200,000 GBP	25,600,000 GBP	5 20.9 GBP	4,377,200,000 GBP	374,100,000 GBP	1,266,000,000 GBP	2,433,200,000 GBP	2,200,000 GBP	1,400,000 GBP	191,600,000 GBP	430,800,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	– GBP	—	—	– GBP	– GBP	—	– GBP	– GBP	429,100,000 GBP	—	– GBP	—	– GBP	—	– GBP	—	—	—	– GBP	—	—	—	429,100,000 GBP	429,100,000 GBP	1,734,900,000 GBP	—	—	—	– GBP	—	—	– GBP	1,7 34.8 GBP	—	– GBP	—	—	—	—	– GBP	– GBP	—	– GBP	100,000 GBP	– GBP	—	1,734,800,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	20,000,000 GBP	—	4 7.7 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	– GBP	—	—	– GBP	1,700,000 GBP	—	– GBP	– GBP	449,100,000 GBP	—	– GBP	—	194,900,000 GBP	—	156,400,000 GBP	—	—	—	– GBP	—	—	—	449,100,000 GBP	408,900,000 GBP	1,687,200,000 GBP	—	—	—	– GBP	—	—	– GBP	1,748,600,000 GBP	—	4,800,000 GBP	—	—	—	—	– GBP	– GBP	—	145,100,000 GBP	100,000 GBP	– GBP	—	1,687,100,000 GBP	88,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	—	– GBP	– GBP	—	– GBP	– GBP	135,700,000 GBP	—	– GBP	—	– GBP	—	– GBP	—	—	—	– GBP	—	—	—	135,700,000 GBP	1 35.7 GBP	71,500,000 GBP	—	—	—	– GBP	—	—	– GBP	71,500,000 GBP	—	– GBP	—	—	—	—	– GBP	– GBP	—	– GBP	– GBP	– GBP	—	71,500,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	—	—	– GBP	– GBP	—	– GBP	3,300,000 GBP	3,300,000 GBP	—	– GBP	—	– GBP	—	– GBP	—	—	—	– GBP	—	—	—	3,300,000 GBP	– GBP	2,200,000 GBP	—	—	—	– GBP	—	—	– GBP	– GBP	—	– GBP	—	—	—	—	2,200,000 GBP	– GBP	—	– GBP	– GBP	– GBP	—	2,200,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—