Note 8 - Other Real Estate Investments (Details) - Preferred Equity Investments - Balance Sheet Disclosures (Preferred Equity Investments [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 8 - Other Real Estate Investments (Details) - Preferred Equity Investments - Balance Sheet Disclosures [Line Items]
Assets	$ 1,123.5	$ 1,247.8
Partners’/Members’ capital	334.3	343.6
	1,123.5	1,247.8
Real estate, net [Member]
Note 8 - Other Real Estate Investments (Details) - Preferred Equity Investments - Balance Sheet Disclosures [Line Items]
Assets	456.9	571.7
Other Assets [Member]
Note 8 - Other Real Estate Investments (Details) - Preferred Equity Investments - Balance Sheet Disclosures [Line Items]
Assets	666.6	676.1
Notes and Mortgage Payable [Member]
Note 8 - Other Real Estate Investments (Details) - Preferred Equity Investments - Balance Sheet Disclosures [Line Items]
Liabilities	767.6	878.1
Other Liabilities [Member]
Note 8 - Other Real Estate Investments (Details) - Preferred Equity Investments - Balance Sheet Disclosures [Line Items]
Liabilities	$ 21.6	$ 26.1