Statement Of Comprehensive Income [Abstract]

Hammerson PLC - Filing #1587226

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	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	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Statement of 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 [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract]
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	– GBP	– GBP	– GBP	– GBP	– GBP	18,900,000 GBP	– GBP	– GBP	– GBP	– GBP	18,900,000 GBP	18,900,000 GBP	12,800,000 GBP	– GBP	– GBP	12,800,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	12,800,000 GBP	– GBP
Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]
Exchange differences on translation [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	– GBP	– GBP	– GBP	– GBP	– GBP	139,700,000 GBP	– GBP	139,700,000 GBP	– GBP	– GBP	139,700,000 GBP	– GBP	171 .1 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	171,100,000 GBP	– GBP	– GBP	171,100,000 GBP	– GBP
Cash flow hedges [abstract]
Other comprehensive income, net of tax, cash flow hedges	—	—	—	—	—	—	—	—	—	—	1,700,000 GBP	—	4,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Hedges of net investment in foreign operations [abstract]
Other comprehensive income, net of tax, hedges of net investments in foreign operations	– GBP	– GBP	– GBP	– GBP	– GBP	112,200,000 GBP	– GBP	– GBP	112,200,000 GBP	– GBP	112,200,000 GBP	– GBP	109,200,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	109,200,000 GBP	109,200,000 GBP
Other comprehensive income that will be reclassified to profit or loss, net of tax	—	—	—	—	—	—	—	—	—	—	27,900,000 GBP	—	65,700,000 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
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	—	—	—	449,100,000 GBP	—	1,687,100,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	—	—	—	– GBP	—	100,000 GBP	—	—	—	—	—	—	—	—	—	—	—