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Held for Sale/Disposed Assets - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
property
Redevelopment property, held for sale    
Held For Sale Assets [Line Items]    
Number of properties | property 1  
Disposed of by sale | Washington D.C.    
Held For Sale Assets [Line Items]    
Sales price   $ 20.3
Number of properties sold | property   1
Gain on sale of property   $ 3.3
Disposed of by sale | Los Angeles    
Held For Sale Assets [Line Items]    
Sales price $ 12.4  
Number of properties sold | property 1  
Gain on sale of property $ 4.5  
Disposed of by sale | Miami    
Held For Sale Assets [Line Items]    
Sales price $ 14.0 $ 24.3
Number of properties sold | property 1 1
Gain on sale of property $ 1.8 $ 11.7
Third-party purchaser | Held-for-sale | Washington D.C. | Industrial building    
Held For Sale Assets [Line Items]    
Number of properties | property 1  
Sales price $ 7.5  
Sales price, book value $ 6.0