Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Summarized Financial Information for RioCan - Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Assets	$ 6,991.9	$ 9,031.0
Members' capital	2,914.5	3,593.8
	6,991.9	9,031.0
RioCan [Member] | Real Estate, Net [Member]
Schedule of Equity Method Investments [Line Items]
Assets	1,106.2	1,189.9
RioCan [Member] | Other Assets [Member]
Schedule of Equity Method Investments [Line Items]
Assets	43.8	43.7
RioCan [Member] | Mortgage Payable [Member]
Schedule of Equity Method Investments [Line Items]
Liabilities	743.7	923.2
RioCan [Member] | Other Liabilities [Member]
Schedule of Equity Method Investments [Line Items]
Liabilities	13.0	18.1
RioCan [Member]
Schedule of Equity Method Investments [Line Items]
Assets	1,150.0	1,233.6
Members' capital	393.3	292.3
	$ 1,150.0	$ 1,233.6