Analysis Of Income And Expense [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
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	—	—	—	—	—	—	—	—	—	134,800,000 GBP	—	145,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Material income and expense [abstract]
Gains (losses) on disposals of investment properties [abstract]
Gains (losses) on disposals of investment properties	—	—	—	—	—	—	—	—	—	—	9,800,000 GBP	—	3,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Gains (losses) on disposals of investments [abstract]
Gains (losses) on disposals of investments	—	—	—	—	—	—	—	—	—	—	900,000 GBP	—	– GBP	—	—	—	—	—	—	—	—	—	—	—
Finance income (cost)	—	—	—	—	—	—	—	—	—	—	97,900,000 GBP	—	72,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Gains (losses) on change in fair value of derivatives [abstract]
Gains (losses) on change in fair value of derivatives	—	—	—	—	—	—	—	—	—	—	14,000,000 GBP	—	13,700,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Miscellaneous other comprehensive income [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [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
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
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates accounted for using equity method	—	—	—	—	—	—	—	—	—	—	15,600,000 GBP	—	148,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Share of profit (loss) of joint ventures accounted for using equity method	—	—	—	—	—	—	—	—	—	—	171,300,000 GBP	—	880,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [abstract]
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax	– GBP	– GBP	– GBP	– GBP	– GBP	1,300,000 GBP	– GBP	– GBP	– GBP	– GBP	1,300,000 GBP	1,300,000 GBP	1,000,000 GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP
Comprehensive income, continuing and discontinued operations [abstract]
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 owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	—	—	—	449,100,000 GBP	—	1,687,100,000 GBP	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	—	—	—	– GBP	—	100,000 GBP	—	—	—	—	—	—	—	—	—	—	—