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
Mar. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment (in millions) $ 134.0 $ 126.6
Joint Venture Debt Outstanding 329.3 325.2
Partnership Interest [Member]
   
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment (in millions) 134.0 126.6
Deer Park [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 33.30% 33.30%
Square Feet 741,981 741,981
Carrying Value of Investment (in millions) 2.4 3.0
Joint Venture Debt Outstanding 246.9 246.9
Deer Park Warehouse [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership %   33.30%
Square Feet   29,253
Carrying Value of Investment (in millions)   0
Joint Venture Debt Outstanding   1.9
Houston [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet 352,705 352,705
Carrying Value of Investment (in millions) 39.8 36.7
Joint Venture Debt Outstanding 0 0
National Harbor [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet 0 0
Carrying Value of Investment (in millions) 2.6 2.6
Joint Venture Debt Outstanding 0 0
RioCan Canda [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet 434,562 434,562
Carrying Value of Investment (in millions) 66.8 62.2
Joint Venture Debt Outstanding 19.5 20.1
Westgate [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 58.00% 58.00%
Square Feet 332,234 332,234
Carrying Value of Investment (in millions) 19.6 19.1
Joint Venture Debt Outstanding 38.6 32.0
Wisconsin Dells [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet 265,086 265,086
Carrying Value of Investment (in millions) 2.6 2.8
Joint Venture Debt Outstanding 24.3 24.3
Other [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership %     
Square Feet 0 0
Carrying Value of Investment (in millions) 0.2 0.2
Joint Venture Debt Outstanding $ 0 $ 0