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Investments in Unconsolidated Entities - Unconsolidated Property Transactsions (Details)
$ in Millions
1 Months Ended 3 Months Ended 5 Months Ended 12 Months Ended
Jul. 22, 2015
USD ($)
property
Jul. 07, 2015
USD ($)
shares
Apr. 23, 2015
USD ($)
ft²
Apr. 13, 2015
USD ($)
property
Feb. 24, 2015
USD ($)
Feb. 28, 2015
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
property
Jan. 30, 2014
a
Arizona Mills                    
Investments in Unconsolidated Entities                    
Area of property (in square feet) | a                   39
Ownership interests acquired (as a percent)                   50.00%
Gain due to acquisition of controlling interest             $ 2.7      
Ownership interest after acquisition (as a percent)                   100.00%
Hudson's Bay Company (HBC) Joint Venture                    
Investments in Unconsolidated Entities                    
Committed amount to contribute $ 100.0                  
Contributions for improvements to properties                 $ 1.0  
Contribution to form joint venture                 $ 178.5  
Joint venture ownership percentage               8.90% 8.90%  
Share of net loss               $ 0.7    
Total assets               4,200.0 $ 4,200.0  
Total liabilities               2,900.0 $ 2,900.0  
Total revenues               55.0    
Total operating income               10.0    
Consolidated net income               $ 8.0    
Hudson's Bay Company (HBC) Joint Venture | Hudson Bay Company                    
Investments in Unconsolidated Entities                    
Number of properties contributed to form joint venture | property 42                  
Number of Kaufhof properties purchased by the joint venture | property                 41  
Sears Joint Venture                    
Investments in Unconsolidated Entities                    
Contribution to form joint venture       $ 114.0            
Joint venture ownership percentage       50.00%            
Sears Joint Venture | Sears                    
Investments in Unconsolidated Entities                    
Number of properties contributed to form joint venture | property       10            
Joint venture ownership percentage       50.00%            
Number of property being leased back | property       10            
Sears Joint Venture | Sears | Minimum                    
Investments in Unconsolidated Entities                    
Percentage of property space subject to recapture       50.00%            
Seritage Growth Properties                    
Investments in Unconsolidated Entities                    
Payments to acquire equity method investment   $ 33.0                
Additional shares acquired (in shares) | shares   1,125,760                
Houston Galleria                    
Investments in Unconsolidated Entities                    
Joint venture ownership percentage         50.40%          
Houston Galleria | Mortgages                    
Investments in Unconsolidated Entities                    
Debt refinanced         $ 821.0          
Interest rate on debt (as a percent)         5.44%          
Houston Galleria | Mortgage Maturing March 2025                    
Investments in Unconsolidated Entities                    
Debt issued to refinance previous mortgage         $ 1,200.0          
Interest rate on debt (as a percent)         3.55%          
Excess proceeds from debt financing distributed to venture partners           $ 377.1        
Development project | Brickell City Centre                    
Investments in Unconsolidated Entities                    
Area of property (in square feet) | ft²     500,000              
Property ownership interest (as a percent)     25.00%              
Estimated cost of project, including development fees     $ 110.0