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Real Estate - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Real Estate Tenant Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts receivable $ 1.0 $ 1.5
Deferred Operating Lease    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts receivable $ 1.1 $ 1.8