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) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
sqft
Dec. 31, 2013
sqft
May 30, 2013
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment (in millions) $ 249.7 $ 140.2  
Total Joint Venture Debt (in millions) 221.1 202.7  
Partnership Interest [Member]
      
Schedule of Equity Method Investments [Line Items]      
Carrying Value of Investment (in millions) 249.7 140.2  
Charlotte [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% 50.00% 50.00%
Square Feet 398,000 0  
Carrying Value of Investment (in millions) 38.8 11.6  
Total Joint Venture Debt (in millions) 0 0  
Galveston/Houston [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% 50.00%  
Square Feet 353,000 353,000  
Carrying Value of Investment (in millions) 6.2 7.4  
Total Joint Venture Debt (in millions) 65.0 65.0  
National Harbor [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% 50.00%  
Square Feet 339,000 336,000  
Carrying Value of Investment (in millions) 19.8 16.7  
Total Joint Venture Debt (in millions) 62.0 52.4  
RioCan Canda [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% 50.00%  
Square Feet 432,000 433,000  
Carrying Value of Investment (in millions) 119.8 85.7  
Total Joint Venture Debt (in millions) 16.6 17.9  
Savannah [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% [1]    
Square Feet 0 [1]    
Carrying Value of Investment (in millions) 46.1 [1]    
Total Joint Venture Debt (in millions) 3.4 [1]    
Westgate [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 58.00% 58.00%  
Square Feet 332,000 332,000  
Carrying Value of Investment (in millions) 14.8 16.1  
Total Joint Venture Debt (in millions) 49.8 43.1  
Wisconsin Dells [Member]
      
Schedule of Equity Method Investments [Line Items]      
Ownership % 50.00% 50.00%  
Square Feet 265,000 265,000  
Carrying Value of Investment (in millions) 2.4 2.5  
Total Joint Venture Debt (in millions) 24.3 24.3  
Other [Member]
      
Schedule of Equity Method Investments [Line Items]      
Square Feet 0 0  
Carrying Value of Investment (in millions) 1.8 0.2  
Total Joint Venture Debt (in millions) $ 0 $ 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 gains or losses of asset sales.