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Real Estate - Properties Held For Sale (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Fund II      
Long Lived Assets Held-for-sale [Line Items]      
Number of properties held-for-sale | property     1
Properties held-for-sale     $ 25.4
Disposal group, held-for-sale      
Long Lived Assets Held-for-sale [Line Items]      
Properties held for sale net loss $ 0.5 $ 0.6