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Variable Interest Entities (Details)
$ in Millions
Jun. 30, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Variable Interest Entity [Line Items]    
Number of Real Estate Properties | property 63  
JBG Smith, LP    
Variable Interest Entity [Line Items]    
Ownership interest by parent 90.40%  
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets $ 164.6 $ 242.9
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Number of Real Estate Properties | property 0 2
Assets   $ 136.8
Liabilities   $ 11.8