Related Party Transactions and Arrangements - Related Party Loans Payable (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Property
loan
Jun. 30, 2019
USD ($)
Property
loan
Dec. 31, 2018
USD ($)
Affiliated Entity | Mortgage loans payable      
Related Party Transaction [Line Items]      
Interest expense on note payable $ 67.0 $ 0.1  
Related party notes payable | Affiliated Entity | Mortgage loans payable      
Related Party Transaction [Line Items]      
Number of mortgage loans with related party | loan 4 4  
Number of properties with related party | Property 6 6  
Outstanding principal of related parties notes payable $ 26.4 $ 26.4 $ 27.9
Weighted Average      
Related Party Transaction [Line Items]      
Weighted average effective interest rate 4.75% 4.75%  
Weighted average maturity   5 years 2 months 12 days  
Weighted Average | Related party notes payable | Affiliated Entity | Mortgage loans payable      
Related Party Transaction [Line Items]      
Weighted average effective interest rate 1.00% 1.00%  
Weighted average maturity   8 years 8 months 12 days