Face (par) amount of debt instrument at time of issuance.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Investment, Basis Spread on Variable Rate

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Investments, Carrying Amount Exceeds Fair Value

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Number of Collateralized Loan Obligations Consolidated

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Consolidation - Additional Information (Details)	9 Months Ended
Consolidation - Additional Information (Details)	Sep. 30, 2019 USD ($) collateralized_loan_obligation	Dec. 31, 2018 USD ($)
CLOs
Variable Interest Entity [Line Items]
Number of CLOs consolidated \| collateralized_loan_obligation	5
Investments	$ 1,908,324,000	$ 1,709,266,000
Nonconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 13,800,000
LIBOR \| CLOs
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	8.75%
Senior Notes \| CLOs
Variable Interest Entity [Line Items]
Unpaid principal balance exceeds fair value	$ 56,800,000
Subordinated Notes - Newfleet CLO 2016-1 \| CLOs
Variable Interest Entity [Line Items]
Debt par value	2,000,000,000.0
Subordinated Notes - Newfleet CLO 2016-1 \| Subordinated Debt \| CLOs
Variable Interest Entity [Line Items]
Debt par value	173,000,000.0
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 \| Senior Notes \| CLOs
Variable Interest Entity [Line Items]
Debt par value	$ 1,800,000,000