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Summary of Significant Accounting Policies - Operating Real Estate (Details) - USD ($)
$ in Millions
8 Months Ended 12 Months Ended
Aug. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Real Estate [Line Items]      
Impairment loss   $ 31.0 $ 5.0
Winterfell      
Real Estate [Line Items]      
Impairment loss   24.0  
Kansas City      
Real Estate [Line Items]      
Impairment loss   4.4  
Peregrine Senior Living      
Real Estate [Line Items]      
Impairment loss   $ 10.1  
Watermark      
Real Estate [Line Items]      
Impairment loss $ 2.8