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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 |  |

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