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Repurchased Stock Repurchase Program, Percentage Of Outstanding Shares Repurchased Percentage of Net Assets Fair Value as % of Net Assets % of Partners’ Capital Investment Owned, Net Assets, Percentage March 2025 Notes [Member] March 2025 Notes [Member] O 2026 M2 Aggregate Dividends O 2026 M2 Aggregate Dividends [Member] O 2026 M2 Aggregate Dividends Bermuda/Cayman Islands Bermuda And Cayman Islands [Member] Bermuda And Cayman Islands Deferred financing costs paid Payments Of Debt Issuance Costs, Line Of Credit Arrangements Payments Of Debt Issuance Costs, Line Of Credit Arrangements Middle Peak Funding Facility Middle Peak Funding Facility [Member] Middle Peak Funding Facility [Member] Board of Trustees’ fees payable Trustee Fees Payable Trustee Fees Payable December 2026 Notes December 2026 Notes [Member] December 2026 Notes [Member] Share repurchases Stock Repurchased During Period, Value, Excluding Early Repurchase Deduction Stock Repurchased During Period, Value, Excluding Early Repurchase Deduction Committed contribution Equity Method Investments, Committed Contribution Equity Method Investments, Committed Contribution Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Foreign currency forward contracts Foreign Exchange Forward [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Investments Investment, Policy [Policy Text Block] Short Term Financing Transaction Short Term Financing Transaction [Member] Short Term Financing Transaction Health Care Technology Health Care Technology Sector [Member] Health Care Technology Sector Commitment Fee Scenario [Domain] Commitment Fee Scenario [Domain] Commitment Fee Scenario [Domain] 2024-2 Debt, Senior Secured Floating Rate, Class A-L3 Loans 2024-2 Debt, Senior Secured Floating Rate, Class A-L3 Loans [Member] 2024-2 Debt, Senior Secured Floating Rate, Class A-L3 Loans Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Auto Components Automotive Sector [Member] CLO 2026-2 Debt, Mezzanine Secured Deferrable Floating Rate, Class C Notes 2026-2 Debt Securitization, Mezzanine Secured Deferrable Floating Rate, Class C Notes [Member] 2026-2 Debt Securitization, Mezzanine Secured Deferrable Floating Rate, Class C Notes Dividends [Axis] Dividends [Axis] November 2034 Notes November 2034 Notes [Member] November 2034 Notes O 2025 M4 Aggregate Dividends O 2025 M4 Aggregate Dividends [Member] O 2025 M4 Aggregate Dividends Debt Securities, First Lien, Realized Gain (Loss) Debt Securities, First Lien, Realized Gain (Loss) [Member] Debt Securities, First Lien, Realized Gain (Loss) Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Bard Peak Funding Facility Bard Peak Funding Facility [Member] Bard Peak Funding Facility [Member] Investments at fair value Investment Owned, Balance [Abstract] 2026-1 Static Notes 2026-1 Static Debt [Member] 2026-1 Static Debt Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Equity Method Investments and Joint Ventures [Abstract] Supplemental Data: Investment Company, Supplemental Data [Abstract] Investment Company, Supplemental Data Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Total investment income Gross Investment Income, Operating Derivative liabilities at fair value (Note 6) Total Fair Value Derivative Liability Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Interest Rate Swap 18 Interest Rate Swap 18 [Member] Interest Rate Swap 18 Hedged items Hedged Items [Member] Hedged Items Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Material Holdings, LLC - First Lien Debt Material Holdings, LLC - First Lien Debt 3 [Member] Material Holdings, LLC - First Lien Debt 3 Net Realized Gain (Loss) Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax Structured Finance, Equity Instrument, Realized Gain (Loss) Structured Finance, Equity Instrument, Realized Gain (Loss) [Member] Structured Finance, Equity Instrument, Realized Gain (Loss) Greater than 5 Years Debt, Long-Term and Short-Term Maturities, Repayments of Principal in Rolling Year After Five Debt, Long-Term and Short-Term Maturities, Repayments of Principal in Rolling Year After Five Monarch Peak Funding Facility Monarch Peak Funding Facility [Member] Monarch Peak Funding Facility [Member] Consolidation Consolidation, Policy [Policy Text Block] Portfolio turnover rate Investment Company, Portfolio Turnover Amortization of deferred financing costs Amortization Of Debt Issuance Costs, Line Of Credit Arrangements Amortization Of Debt Issuance Costs, Line Of Credit Arrangements Fair value Investment Company, Financial Commitment to Investee, Future Amount, Fair Value Investment Company, Financial Commitment to Investee, Future Amount, Fair Value Interest Rate Swap 17 Interest Rate Swap 17 [Member] Interest Rate Swap 17 Net of unamortized debt issuance costs Unamortized Debt Issuance Expense Statement [Table] Statement [Table] Contractual sale restriction, remaining period Investment Company, Equity Security, Contractual Sale Restriction, Remaining Period Ground Transportation Ground Transportation Sector [Member] Ground Transportation Sector Debt Instrument Scenario [Axis] Debt Instrument Scenario [Axis] Debt Instrument Scenario Interest income Investment Income, Interest Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Fed Funds Fed Funds Effective Rate Overnight Index Swap Rate [Member] Paper & Forest Products Paper & Forest Products Sector [Member] Paper & Forest Products Sector Material Holdings, LLC - First Lien Debt Material Holdings, LLC - First Lien Debt 2 [Member] Material Holdings, LLC - First Lien Debt 2 Company Pays Derivative, Basis Spread on Variable Rate Pigments Services, Inc. - First Lien Debt Pigments Services, Inc. - First Lien Debt 2 [Member] Pigments Services, Inc. - First Lien Debt 2 Net change in unrealized (appreciation) depreciation on foreign currency and other transactions Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Member]