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Real Estate - Properties Held For Sale (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
property
Fund II      
Long Lived Assets Held-for-sale [Line Items]      
Number of properties held-for-sale | property 1   1
Properties held-for-sale $ 21.5   $ 21.5
Mortgage loans on real estate $ 25.5   $ 25.5
Fund III      
Long Lived Assets Held-for-sale [Line Items]      
Number of properties held-for-sale | property 1    
Properties held-for-sale $ 13.2    
Mortgage loans on real estate 12.0    
Disposal Group, Held-for-sale, Not Discontinued Operations      
Long Lived Assets Held-for-sale [Line Items]      
Properties held for sale net income (loss) $ (0.2) $ 0.2