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Consolidation - Additional Information (Details) | 9 Months Ended |
--- | --- | ---
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 |

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