Note 8 - Other Real Estate Investments and Other Assets - Preferred Equity Investments - Balance Sheet Disclosures (Details) - Preferred Equity Investments [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets:
Real estate, net	$ 110.4	$ 142.3
Other assets	578.8	581.2
Assets	689.2	723.5
Liabilities and Partners’/Members’ Capital:
Mortgages payable, net	314.0	381.9
Other liabilities	3.0	6.0
Partners’/Members’ capital	372.2	335.6
	$ 689.2	$ 723.5