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Real Estate Investments - Assets Held for Sale (Details)
$ in Millions
1 Months Ended
May 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
property
Dec. 31, 2018
property
Long Lived Assets Held-for-sale [Line Items]      
Number of properties held for sale | property   2 1
Pennsylvania      
Long Lived Assets Held-for-sale [Line Items]      
Impairment of assets held-for-sale $ 5.2    
Real Estate Dispositions | Pennsylvania      
Long Lived Assets Held-for-sale [Line Items]      
Expected purchase price   $ 14.0  
Net investment in property held for sale   $ 1.3