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Consolidation - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
collateralized_loan_obligation
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]    
Debt instrument, collateral amount $ 0  
CLOs    
Variable Interest Entity [Line Items]    
Number of consolidated CLOs | collateralized_loan_obligation 5  
Number of consolidated CLOs, in warehouse-stage | collateralized_loan_obligation 1  
Investments $ 1,976,148,000 $ 1,709,266,000
CLOs | London Interbank Offered Rate (LIBOR)    
Variable Interest Entity [Line Items]    
Investments, basis spread on variable interest rate 10.00%  
CLOs | London Interbank Offered Rate (LIBOR) | Minimum    
Variable Interest Entity [Line Items]    
Basis spread on variable interest rate 0.80%  
CLOs | London Interbank Offered Rate (LIBOR) | Maximum    
Variable Interest Entity [Line Items]    
Basis spread on variable interest rate 8.70%  
CLOs | Senior notes    
Variable Interest Entity [Line Items]    
Unpaid principal balance exceeds fair value $ 59,500,000  
CLOs | CLO senior secured floating rate notes | Senior notes    
Variable Interest Entity [Line Items]    
Debt par value 1,800,000,000  
CLOs | CLO subordinated notes    
Variable Interest Entity [Line Items]    
Debt par value 2,000,000,000.0  
CLOs | CLO subordinated notes | Warehouse Facility Debt    
Variable Interest Entity [Line Items]    
Debt par value 8,300,000  
CLOs | CLO subordinated notes | Subordinated debt    
Variable Interest Entity [Line Items]    
Debt par value 193,000,000.0  
Consolidated investment products    
Variable Interest Entity [Line Items]    
Investments 2,030,110,000 $ 1,749,568,000
Nonconsolidated VIEs    
Variable Interest Entity [Line Items]    
Carrying value and maximum risk of loss $ 14,400,000