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
Jun. 30, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment (in millions) $ 162.1 $ 126.6
Joint Venture Debt Outstanding 336.3 325.2
Partnership Interest [Member]
   
Schedule of Equity Method Investments [Line Items]    
Carrying Value of Investment (in millions) 162.1 126.6
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) 2.0 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
Galveston/Houston [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet   352,705
Carrying Value of Investment (in millions) 40.1 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) 17.3 2.6
Joint Venture Debt Outstanding 4.2 0
RioCan Canda [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 50.00% 50.00%
Square Feet 434,162 434,562
Carrying Value of Investment (in millions) 82.3 62.2
Joint Venture Debt Outstanding 18.7 20.1
Westgate [Member]
   
Schedule of Equity Method Investments [Line Items]    
Ownership % 58.00% 58.00%
Square Feet   332,234
Carrying Value of Investment (in millions) 16.8 19.1
Joint Venture Debt Outstanding 42.2 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) 2.5 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) 1.1 0.2
Joint Venture Debt Outstanding $ 0 $ 0