Note 8 - Investment and Advances in Real Estate Joint Ventures - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (Details) - Excluding KIR and Rio Can [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets	$ 3,966.5	$ 5,134.8
Noncontrolling interests	15.9	16.2
Partners’/Members’ capital	1,805.3	2,199.9
	3,966.5	5,134.8
Real Estate [Member]
Assets	3,741.9	4,855.5
Other Assets [Member]
Assets	224.6	279.3
Notes Payable [Member]
Liabilities	214.5	29.7
Mortgages Payable and Construction Loans [Member]
Liabilities	1,848.5	2,769.4
Other Liabilities [Member]
Liabilities	$ 82.3	$ 119.6