INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Oct. 20, 2011 item	May 06, 2011 item
Income taxes
Increase in the tax indemnity receivable	$ 1.9
Increase in tax indemnity receivable due to the increase in the related interest income	1.9
Increase in tax indemnity receivable due to the increase in the remeasurement gain	0
Unrecognized tax benefits, excluding interest	90.5	90.5
Accrued interest related to unrecognized tax benefits	40.5	38.7
Interest expense related to unrecognized tax benefits	1.9
Deferred tax liabilities related to land and buildings		48.0
GGP
Income taxes
Number of former taxable REIT subsidiaries subject to litigation for which motion is filed to consolidate cases			2	2
Percentage of certain taxes indemnified by related party	93.75%
Amount of interest income receivable on the Tax Indemnity receivable	40.5	38.6
Amount of combined deficiencies determined by the IRS sought to be overturned by the petition filed				144.1
GGP | Maximum
Income taxes
Amount of certain taxes indemnified by related party	$ 303.8