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Consolidation - Additional Information (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
collateralized_loan_obligation
Dec. 31, 2019
USD ($)
CLOs    
Variable Interest Entity [Line Items]    
Number of CLOs consolidated | collateralized_loan_obligation 6  
Investments $ 2,231,691,000 $ 1,976,148,000
Nonconsolidated    
Variable Interest Entity [Line Items]    
Carrying value and maximum risk of loss $ 26,200,000  
LIBOR | CLOs    
Variable Interest Entity [Line Items]    
Investments, basis spread on variable interest rate 12.00%  
Senior Notes | CLOs    
Variable Interest Entity [Line Items]    
Unpaid principal balance exceeds fair value $ 135,800,000  
Subordinated Notes - Newfleet CLO 2016-1 | CLOs    
Variable Interest Entity [Line Items]    
Debt par value 2,500,000,000  
Subordinated Notes - Newfleet CLO 2016-1 | Subordinated Debt | CLOs    
Variable Interest Entity [Line Items]    
Debt par value 225,900,000  
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | Senior Notes | CLOs    
Variable Interest Entity [Line Items]    
Debt par value $ 2,200,000,000  
Minimum | Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | LIBOR | CLOs    
Variable Interest Entity [Line Items]    
Basis spread on variable rate 0.80%  
Maximum | Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | LIBOR | CLOs    
Variable Interest Entity [Line Items]    
Basis spread on variable rate 8.70%