Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details)

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Investments in Unconsolidated Real Estate Joint Ventures (Unconsolidated Real Estate Joint Ventures) (Details)
ft² in Thousands, $ in Millions
Sep. 30, 2015
USD ($)
ft²
Mar. 31, 2015
ft²
Dec. 31, 2014
USD ($)
ft²
Schedule of Equity Method Investments [Line Items]      
Total Joint Venture Debt (in millions) $ 242.7   $ 268.2
Partnership Interest [Member]      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment (in millions) $ 198.0   $ 208.0
Columbus [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%    
Square Feet | ft² 0    
Carrying Value of Investment (in millions) $ 10.2    
Total Joint Venture Debt (in millions) $ 0.0    
National Harbor [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 339   339
Carrying Value of Investment (in millions) $ 8.6   $ 9.5
Total Joint Venture Debt (in millions) $ 83.7   $ 83.7
RioCan Canda [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00%   50.00%
Square Feet | ft² 870   870
Carrying Value of Investment (in millions) $ 120.0   $ 132.5
Total Joint Venture Debt (in millions) $ 11.9   $ 15.7
Savannah [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [1] 50.00%   50.00%
Square Feet | ft² 377   0 [1]
Carrying Value of Investment (in millions) $ 46.7   $ 46.5 [1]
Total Joint Venture Debt (in millions) [1] $ 85.1   $ 25.5
Westgate [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 58.00%   58.00%
Square Feet | ft² 414 414 381
Carrying Value of Investment (in millions) $ 12.5   $ 14.3
Total Joint Venture Debt (in millions) $ 62.0   $ 54.0
Wisconsin Dells [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership %     50.00%
Square Feet | ft²     265
Carrying Value of Investment (in millions)     $ 2.4
Total Joint Venture Debt (in millions)     $ 24.3
Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Square Feet | ft²     0
Carrying Value of Investment (in millions)     $ 1.5
Total Joint Venture Debt (in millions)     $ 0.0
Charlotte [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % [2] 50.00%   50.00%
Square Feet | ft² [2] 398   398
Equity Method Investment Reported In Liabilities [2] $ (0.9)   $ (2.2)
Total Joint Venture Debt (in millions) [2] $ 90.0   $ 90.0
Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% [2]   50.00%
Square Feet | ft² 353 [2]   353
Carrying Value of Investment (in millions)     $ 1.3
Equity Method Investment Reported In Liabilities [2] $ (0.5)    
Total Joint Venture Debt (in millions) 65.0 [2]   $ 65.0
Charlotte and Galveston/Houston [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment Reported In Liabilities (1.4)    
Total Joint Venture Debt (in millions) $ 155.0    
[1] Based on capital contribution and distribution provisions in the joint venture agreement, we expect our economic interest in the venture's cash flow to be greater than the ownership percentage indicated above, which in this case, states our legal interest in this venture. Our economic interest may fluctuate based on a number of factors, including mortgage financing, partnership capital contributions and distributions, and proceeds from asset sales.
[2] The negative carrying value is due to the distributions of proceeds from mortgage loans and quarterly distributions of excess cash flow exceeding the original contributions from the partners.