Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Investment and Advances to Real Estate Joint Ventures - Income Statements (Excluding KIR and RioCan [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Excluding KIR and RioCan [Member]
Schedule of Investments [Line Items]
Revenues from rental property	$ 655.8	$ 873.3	$ 1,009.2
Operating expenses	(201.2)	(279.7)	(330.6)
Interest expense	(169.3)	(228.5)	(281.3)
Depreciation and amortization	(187.3)	(224.0)	(258.4)
Impairment charges	(20.0)	(32.3)	(17.0)
Other expense, net	(11.6)	(13.8)	(19.8)
	(589.4)	(778.3)	(907.1)
Income from continuing operations	66.4	95.0	102.1
Discontinued Operations:
Income/(loss) from discontinued operations	2.6	12.2	(9.1)
Impairment on dispositions of properties	0.5	(5.0)	(21.1)
Gain on dispositions of properties	466.6	223.4	94.5
Net income	$ 536.1	$ 325.6	$ 166.4