v3.25.1
Commitments and Contingencies - Schedule of Unfunded Commitments (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Unfunded Debt Securities    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments $ 1,636.5 $ 1,534.1
Unfunded Equity/Other Commitments    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 394.8 $ 387.1
Investment, Identifier [Axis]: 3Pillar Global Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.3  
Investment, Identifier [Axis]: 48Forty Solutions LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.6  
Investment, Identifier [Axis]: ATX Networks Corp    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.4  
Investment, Identifier [Axis]: Aareon AG    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 15.1  
Investment, Identifier [Axis]: Advanced Dermatology & Cosmetic Surgery    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.7  
Investment, Identifier [Axis]: Affordable Care Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.3  
Investment, Identifier [Axis]: Alacrity Solutions Group LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.7  
Investment, Identifier [Axis]: Alacrity Solutions Group LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.3  
Investment, Identifier [Axis]: Alpha Financial Markets Consulting PLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.8  
Investment, Identifier [Axis]: Altitude II IRL WH Borrower DAC, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.5  
Investment, Identifier [Axis]: American Vision Partners    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.9  
Investment, Identifier [Axis]: Amerivet Partners Management Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.4  
Investment, Identifier [Axis]: Apex Service Partners LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.8  
Investment, Identifier [Axis]: Apex Service Partners LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.3  
Investment, Identifier [Axis]: Arcfield Acquisition Corp    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.0  
Investment, Identifier [Axis]: Arcos LLC/VA    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.5  
Investment, Identifier [Axis]: Area Wide Protective Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 12.1  
Investment, Identifier [Axis]: Avetta LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.6  
Investment, Identifier [Axis]: Avetta LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.7  
Investment, Identifier [Axis]: BGB Group LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.4  
Investment, Identifier [Axis]: BGB Group LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 19.9  
Investment, Identifier [Axis]: Bausch Health Cos Inc, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 60.0  
Investment, Identifier [Axis]: Bonterra LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 17.0  
Investment, Identifier [Axis]: Bonterra LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 14.2  
Investment, Identifier [Axis]: CFC Underwriting Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.7  
Investment, Identifier [Axis]: CLEAResult Consulting Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.5  
Investment, Identifier [Axis]: CLEAResult Consulting Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.5  
Investment, Identifier [Axis]: CSafe Global    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.3  
Investment, Identifier [Axis]: Cadence Education LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.5  
Investment, Identifier [Axis]: Cadence Education LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.6  
Investment, Identifier [Axis]: Callodine Commercial Finance LLC, 2L Term Loan B    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 36.1  
Investment, Identifier [Axis]: Cambrex Corp 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.4  
Investment, Identifier [Axis]: Cambrex Corp 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.2  
Investment, Identifier [Axis]: Carrier Fire Protection 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.1  
Investment, Identifier [Axis]: Carrier Fire Protection 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.6  
Investment, Identifier [Axis]: Circana Group (f.k.a. NPD Group)    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.9  
Investment, Identifier [Axis]: Civica Group Ltd 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.4  
Investment, Identifier [Axis]: Civica Group Ltd 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.4  
Investment, Identifier [Axis]: Clarience Technologies LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 20.2  
Investment, Identifier [Axis]: Clarience Technologies LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.8  
Investment, Identifier [Axis]: Community Brands Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.4  
Investment, Identifier [Axis]: Community Brands Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.8  
Investment, Identifier [Axis]: Consilium Safety Group AB    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10.5  
Investment, Identifier [Axis]: Curia Global Inc, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 41.3  
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.9  
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.5  
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC 3    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 22.6  
Investment, Identifier [Axis]: Dental365 LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.6  
Investment, Identifier [Axis]: Dental365 LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.0  
Investment, Identifier [Axis]: DuBois Chemicals Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 14.7  
Investment, Identifier [Axis]: DuBois Chemicals Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 14.7  
Investment, Identifier [Axis]: Envirotainer Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.8  
Investment, Identifier [Axis]: Excelitas Technologies Corp 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.4  
Investment, Identifier [Axis]: Excelitas Technologies Corp 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 23.4  
Investment, Identifier [Axis]: Florida Food Products LLC, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.0  
Investment, Identifier [Axis]: Follett Software Co    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.9  
Investment, Identifier [Axis]: Fortna Group Inc, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 27.4  
Investment, Identifier [Axis]: Foundation Consumer Brands LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.7  
Investment, Identifier [Axis]: Foundation Risk Partners Corp 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.8  
Investment, Identifier [Axis]: Foundation Risk Partners Corp 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.8  
Investment, Identifier [Axis]: Foundation Risk Partners Corp 3    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 15.9  
Investment, Identifier [Axis]: Frontline Road Safety LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 26.5  
Investment, Identifier [Axis]: Frontline Road Safety LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 15.7  
Investment, Identifier [Axis]: Frontline Road Safety LLC 3    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.3  
Investment, Identifier [Axis]: Galway Partners Holdings LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.8  
Investment, Identifier [Axis]: Galway Partners Holdings LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.9  
Investment, Identifier [Axis]: Gigamon Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.5  
Investment, Identifier [Axis]: Granicus Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.3  
Investment, Identifier [Axis]: Granicus Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.0  
Investment, Identifier [Axis]: GreenSky Holdings LLC, Term Loan    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.0  
Investment, Identifier [Axis]: HM Dunn Co Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.6  
Investment, Identifier [Axis]: Heniff Transportation Systems LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.5  
Investment, Identifier [Axis]: Heritage Environmental Services Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.0  
Investment, Identifier [Axis]: Heritage Environmental Services Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.0  
Investment, Identifier [Axis]: Higginbotham Insurance Agency Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10.6  
Investment, Identifier [Axis]: Highgate Hotels Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.6  
Investment, Identifier [Axis]: Homrich & Berg Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.0  
Investment, Identifier [Axis]: Horizon CTS Buyer LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13.8  
Investment, Identifier [Axis]: Horizon CTS Buyer LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 15.9  
Investment, Identifier [Axis]: Individual FoodService    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.7  
Investment, Identifier [Axis]: Inhabit IQ 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.6  
Investment, Identifier [Axis]: Inhabit IQ 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.2  
Investment, Identifier [Axis]: Insight Global LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 36.6  
Investment, Identifier [Axis]: Insightsoftware.Com Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.5  
Investment, Identifier [Axis]: Insightsoftware.Com Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.3  
Investment, Identifier [Axis]: Integrity Marketing Group LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.1  
Investment, Identifier [Axis]: Integrity Marketing Group LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.5  
Investment, Identifier [Axis]: J S Held LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.9  
Investment, Identifier [Axis]: J S Held LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 14.7  
Investment, Identifier [Axis]: Karman Space Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.2  
Investment, Identifier [Axis]: Kestra Financial Inc, Preferred Equity    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.2  
Investment, Identifier [Axis]: Laboratoires Vivacy SAS    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.6  
Investment, Identifier [Axis]: Lazer Logistics Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.4  
Investment, Identifier [Axis]: Lazer Logistics Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.7  
Investment, Identifier [Axis]: Legends Hospitality LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.4  
Investment, Identifier [Axis]: Legends Hospitality LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.9  
Investment, Identifier [Axis]: Lexitas Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.6  
Investment, Identifier [Axis]: Lexitas Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 28.6  
Investment, Identifier [Axis]: Lloyd's Register Quality Assurance Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.3  
Investment, Identifier [Axis]: MAI Capital Management LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.0  
Investment, Identifier [Axis]: MAI Capital Management LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.9  
Investment, Identifier [Axis]: MB2 Dental Solutions LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 32.7  
Investment, Identifier [Axis]: MB2 Dental Solutions LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10.7  
Investment, Identifier [Axis]: Magna Legal Services LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.2  
Investment, Identifier [Axis]: Magna Legal Services LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.5  
Investment, Identifier [Axis]: Med-Metrix    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.8  
Investment, Identifier [Axis]: Mercer Advisors Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 19.7  
Investment, Identifier [Axis]: Misys Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.1  
Investment, Identifier [Axis]: Model N Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.1  
Investment, Identifier [Axis]: Model N Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.2  
Investment, Identifier [Axis]: Net Documents    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.8  
Investment, Identifier [Axis]: Netsmart Technologies Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.2  
Investment, Identifier [Axis]: Netsmart Technologies Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.3  
Investment, Identifier [Axis]: Nordic Climate Group Holding AB    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.2  
Investment, Identifier [Axis]: NovaTaste Austria GmbH    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.1  
Investment, Identifier [Axis]: OEConnection LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.4  
Investment, Identifier [Axis]: OEConnection LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.3  
Investment, Identifier [Axis]: Opendoor Labs Inc, Structured Mezzanine    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13.2  
Investment, Identifier [Axis]: Oxford Global Resources LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 7.6  
Investment, Identifier [Axis]: PCI Pharma Services 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 52.1  
Investment, Identifier [Axis]: PCI Pharma Services 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.9  
Investment, Identifier [Axis]: PSC Group 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.6  
Investment, Identifier [Axis]: PSC Group 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.0  
Investment, Identifier [Axis]: PartsSource Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.3  
Investment, Identifier [Axis]: PartsSource Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 16.9  
Investment, Identifier [Axis]: Powin Energy Corp/NV, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 25.8  
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10.7  
Investment, Identifier [Axis]: RSC Insurance Brokerage Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.6  
Investment, Identifier [Axis]: Radwell International LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.1  
Investment, Identifier [Axis]: Radwell International LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 61.6  
Investment, Identifier [Axis]: Revere Superior Holdings Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.8  
Investment, Identifier [Axis]: Rialto Capital Management LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 0.5  
Investment, Identifier [Axis]: Rockefeller Capital Management LP    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.7  
Investment, Identifier [Axis]: SAMBA Safety Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.4  
Investment, Identifier [Axis]: STV Group Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.5  
Investment, Identifier [Axis]: STV Group Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.9  
Investment, Identifier [Axis]: Safe-Guard Products International LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 8.8  
Investment, Identifier [Axis]: Service Express Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.8  
Investment, Identifier [Axis]: Service Express Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.3  
Investment, Identifier [Axis]: Shaw Development LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.4  
Investment, Identifier [Axis]: Spins LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.8  
Investment, Identifier [Axis]: Spins LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.2  
Investment, Identifier [Axis]: Spotless Brands LLC    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13.4  
Investment, Identifier [Axis]: Sweeping Corp of America Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.7  
Investment, Identifier [Axis]: TalkTalk Telecom Group Ltd, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13.9  
Investment, Identifier [Axis]: Time Manufacturing Co    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 16.7  
Investment, Identifier [Axis]: Trescal SA    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.4  
Investment, Identifier [Axis]: Trinseo Materials Operating SCA / Trinseo Materials Finance Inc, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.7  
Investment, Identifier [Axis]: Tropicana Products Inc, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10.4  
Investment, Identifier [Axis]: Turnpoint Services Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.3  
Investment, Identifier [Axis]: Turnpoint Services Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.5  
Investment, Identifier [Axis]: USIC Holdings Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.5  
Investment, Identifier [Axis]: USIC Holdings Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.9  
Investment, Identifier [Axis]: Valeo Foods Group Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.0  
Investment, Identifier [Axis]: Veriforce LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 4.7  
Investment, Identifier [Axis]: Veriforce LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 3.7  
Investment, Identifier [Axis]: Vermont Information Processing Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.6  
Investment, Identifier [Axis]: Vermont Information Processing Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.9  
Investment, Identifier [Axis]: Version1 Software Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 13.0  
Investment, Identifier [Axis]: VetCor Professional Practices LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.7  
Investment, Identifier [Axis]: VetCor Professional Practices LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 20.8  
Investment, Identifier [Axis]: Vietjet Aviation JSC, Term Loan    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 32.5  
Investment, Identifier [Axis]: Vitu    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 9.1  
Investment, Identifier [Axis]: Waste Services Group Pty Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.9  
Investment, Identifier [Axis]: Wealth Enhancement Group LLC 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 2.8  
Investment, Identifier [Axis]: Wealth Enhancement Group LLC 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 20.1  
Investment, Identifier [Axis]: Weber-Stephen Products LLC, Revolver    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.8  
Investment, Identifier [Axis]: Woolpert Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 18.6  
Investment, Identifier [Axis]: Woolpert Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 31.2  
Investment, Identifier [Axis]: Worldwise Inc    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 1.7  
Investment, Identifier [Axis]: Zellis Holdings Ltd    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 5.0  
Investment, Identifier [Axis]: Zendesk Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 14.4  
Investment, Identifier [Axis]: Zendesk Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 6.0  
Investment, Identifier [Axis]: Zeus Industrial Products Inc 1    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 11.6  
Investment, Identifier [Axis]: Zeus Industrial Products Inc 2    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments 10.0  
Investment, Identifier [Axis]: iNova Pharmaceuticals (Australia) Pty Limited    
Financial Support for Nonconsolidated Legal Entity [Line Items]    
Unfunded commitments $ 2.5