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Subsequent Events - Real Estate Investment Activity (Details)
$ in Millions
1 Months Ended 6 Months Ended
Jul. 22, 2020
USD ($)
property
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Subsequent Event [Line Items]      
Estimated gain (loss) on sale of properties   $ (0.2) $ (0.8)
Property Disposition, 2020 [Member]      
Subsequent Event [Line Items]      
Carrying value of properties classified as held for sale   $ 1.1  
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Estimated gain (loss) on sale of properties $ (0.4)    
Number of real estate properties acquired | property 0    
Subsequent Event [Member] | Property Disposition, 2020 [Member]      
Subsequent Event [Line Items]      
Number of real estate properties disposed | property 3    
Aggregate gross sales price $ 1.1    
Number of real estate property held for sale, disposed | property 2