Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Investment and Advances to Real Estate Joint Ventures - Income Statements (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investment and Advances to Real Estate Joint Ventures - Income Statements [Abstract]
Revenues from rental property	$ 935.1	$ 1,066.8	$ 1,109.3
Operating expenses	(297.6)	(348.1)	(388.8)
Interest expense	(253.6)	(306.9)	(329.4)
Depreciation and amortization	(242.0)	(277.6)	(322.6)
Impairment charges	(32.3)	(25.9)	(13.5)
Other (expense)/income, net	(14.5)	(11.3)	7.4
	(840.0)	(969.8)	(1,046.9)
Income from continuing operations	95.1	97.0	62.4
Discontinued Operations:
Income/(loss) from discontinued operations	12.1	(4.0)	30.6
Impairment on dispositions of properties	(5.0)	(21.1)	(75.7)
Gain/(loss) on dispositions of properties	223.4	94.5	(0.1)
Net income	$ 325.6	$ 166.4	$ 17.2