Quarterly report pursuant to Section 13 or 15(d)

Developments of Consolidated Outlet Centers (Details)

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Developments of Consolidated Outlet Centers (Details)
ft² in Thousands, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2015
USD ($)
ft²
Jan. 31, 2015
ft²
Properties under development [Member]      
Real Estate Properties [Line Items]      
Square Feet | ft² 670 670  
Costs incurred to date   $ 75.3  
Borrowed to date $ 0.0 0.0  
Grand Rapids [Member]      
Real Estate Properties [Line Items]      
Costs incurred to date   48.0  
Borrowed to date $ 0.0 $ 0.0  
Southaven [Member]      
Real Estate Properties [Line Items]      
Square Feet | ft² 320 320 320
Costs incurred to date $ 27.3    
Borrowed to date $ 0.0 $ 0.0