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Related Party Transactions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
property
director
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
property
director
Sep. 30, 2018
USD ($)
Related Party Transaction [Line Items]        
Area of real estate property (in square feet) | ft² 10,100,000   10,100,000  
Number of directors | director 1   1  
Affliliated entity | Supervisory fee revenue        
Related Party Transaction [Line Items]        
Revenue from related parties $ 0.2 $ 0.2 $ 0.7 $ 0.9
Affliliated entity | Property management fee revenue        
Related Party Transaction [Line Items]        
Revenue from related parties 0.1 0.1 0.2 0.3
Affliliated entity | Leased space rental        
Related Party Transaction [Line Items]        
Revenue from related parties $ 0.1 $ 0.1 $ 0.2 $ 0.3
Number of properties | property 1   1  
Lease cancellation, notice period (in days)     90 days  
Affliliated entity | Annualized rent revenue        
Related Party Transaction [Line Items]        
Revenue from related parties     $ 4.6  
Undivided Interest        
Related Party Transaction [Line Items]        
Area of real estate property (in square feet) | ft² 5,351   5,351  
Chairman emeritus | Leased space rental        
Related Party Transaction [Line Items]        
Percentage of lease space occupied by Chairman emeritus and employee     15.00%