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Operating Real Estate - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
May 31, 2019
USD ($)
property
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Real Estate [Line Items]        
Impairment loss   $ 10.1 $ 5.2  
Peregrine        
Real Estate [Line Items]        
Number of properties sold | property 2      
Proceeds from sale of held-for-sale property $ 19.7      
Proceeds from sale of held-for-sale property, net 3.3      
Peregrine | Mortgages | Non-Recourse        
Real Estate [Line Items]        
Long-term debt $ 16.4      
Building and Building Improvements        
Real Estate [Line Items]        
Impairment loss   $ 41.0   $ 31.0