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Senior Secured Loan (Details)
$ in Millions
Jun. 30, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
Improved land parcels    
Number of properties | property 22  
Senior Secured Loan Receivable    
Loan, stated interest rate 8.00%  
Loan outstanding, net of deferred income $ 0.0 $ 15.9
Loan, deferred income 0.0 0.1
Interest receivable $ 0.0 $ 0.3
Senior Secured Loan Receivable | Improved land parcels | Real Estate    
Number of properties | property 6