Note 8 - Investment and Advances in Real Estate Joint Ventures (Detail) - Investment and Advances to Real Estate Joint Ventures - Income Statements (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from rental property	$ 1,074.5	$ 1,115.4	$ 1,028.6
Operating expenses	(350.2)	(390.5)	(368.1)
Interest expense	(311.3)	(332.7)	(316.6)
Depreciation and amortization	(283.3)	(325.1)	(313.3)
Impairment charges	(15.5)	(20.9)	(3.1)
Other (expense)/income, net	(11.2)	22.9	(18.4)
	(971.5)	(1,046.3)	(1,019.5)
Income from continuing operations	103.0	69.1	9.1
Discontinued Operations:
Income/(loss) from discontinued operations	0.3	16.6	(12.4)
Impairment on dispositions of properties	(31.4)	(68.4)	(194.3)
Gain on dispositions of properties	94.5	(0.1)	3.1
Net income/(loss)	$ 166.4	$ 17.2	$ (194.5)