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Business and Organization (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Aug. 25, 2017
Business Acquisition [Line Items]      
Assets under management $ 43,000.0 $ 43,000.0  
Restructuring costs 19.3    
Parent | Colony Capital Operating Company, LLC      
Business Acquisition [Line Items]      
General partner ownership percent   93.90%  
Certain Employees | Colony Capital Operating Company, LLC      
Business Acquisition [Line Items]      
Senior management ownership percent   6.10%  
Combination Agreement | Minimum      
Business Acquisition [Line Items]      
Ownership percentage     38.00%
Combination Agreement | Maximum      
Business Acquisition [Line Items]      
Ownership percentage     100.00%
Employee Severance      
Business Acquisition [Line Items]      
Restructuring costs 14.5    
Accelerated Equity-Based Compensation      
Business Acquisition [Line Items]      
Restructuring costs $ 4.7