Quarterly report pursuant to Section 13 or 15(d)

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

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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Charlotte [Member]
sqft
Sep. 30, 2013
Charlotte [Member]
SquareFeet
sqft
May 30, 2013
Charlotte [Member]
Sep. 30, 2013
Deer Park [Member]
Dec. 31, 2012
Deer Park [Member]
sqft
Sep. 30, 2013
Deer Park Warehouse [Member]
Dec. 31, 2012
Deer Park Warehouse [Member]
sqft
Jul. 31, 2013
Galveston/Houston [Member]
Sep. 30, 2013
Galveston/Houston [Member]
sqft
Dec. 31, 2012
Galveston/Houston [Member]
sqft
Sep. 30, 2013
National Harbor [Member]
store
sqft
Sep. 30, 2013
National Harbor [Member]
sqft
store
Dec. 31, 2012
National Harbor [Member]
sqft
Sep. 30, 2013
RioCan Canda [Member]
sqft
Dec. 31, 2012
RioCan Canda [Member]
sqft
Mar. 31, 2013
Cookstown [Member]
Sep. 30, 2013
Cookstown [Member]
store
sqft
Sep. 30, 2013
Ottawa [Member]
store
sqft
Sep. 30, 2013
Westgate [Member]
sqft
Dec. 31, 2012
Westgate [Member]
sqft
Schedule of Equity Method Investments [Line Items]                                            
Equity method investments $ 136.9 $ 126.6 $ 5.9 $ 5.9     $ 3.0   $ 0   $ 7.7 $ 36.7 $ 17.5 $ 17.5 $ 2.6 $ 86.7 $ 62.2       $ 16.4 $ 19.1
Estimated square footage of real estate property when completed       400,000                   340,000                
Company portion of contributed capital to the joint venture     5.9                     17.2                
Proceeds from sale of foreclosed assets               1.2                            
Ownership %     50.00% 50.00% 50.00%   33.30%   33.30%   50.00% 50.00% 50.00% 50.00% 50.00% 50.00% 50.00%       58.00% 58.00%
Joint venture debt, maximum borrowings                   70.0                        
Interst rate, basis spread on variable rate           3.25%       1.50%     1.65%                  
Proceeds from joint venture debt                   65.0                        
Number of outlet stores                         80 80         35 80    
Joint venture debt                         62.0 62.0                
Joint venture debt outstanding 179.2 325.2 0 0     246.9   1.9   65.0 0 28.1 28.1 0 18.8 20.1       43.0 32.0
Payments to acquire real estate                                   $ 13.9   $ 28.7    
Estimated square feet of expansion                                     153,000 303,000    
Square Feet     0 0     741,981   29,253   347,930 352,705 0 0 0 434,162 434,562       331,739 332,234