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Bank, N.A. Wells Fargo Bank [Member] Wells Fargo Bank Unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Financial Instruments [Domain] Financial Instruments [Domain] Variable Rate Scenario [Axis] Variable Rate Scenario [Axis] Variable Rate Scenario Total return based on market value Investment Company, Total Return, Market Value Interest Rate Swap 4 Interest Rate Swap 4 [Member] Interest Rate Swap 4 Schedule of Senior Securities Derivative asset Derivative Asset Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Align Precision Group, LLC - First Lien Debt 1 Align Precision Group, LLC - First Lien Debt 1 [Member] Align Precision Group, LLC - First Lien Debt 1 Issuance of Common Shares, net of offering and underwriting costs Stock Issued During Period, Value, New Issues Interest payable Increase (Decrease) in Interest Payable, Net Proceeds from 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during the period Stock Issued Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] January 2031 Notes January 2031 Notes [Member] January 2031 Notes Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Sale of Stock [Axis] Sale of Stock [Axis] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Dividends Declared Dividends Declared [Table Text Block] Pharmaceuticals Pharmaceuticals Sector [Member] Pharmaceuticals Sector Current Fiscal Year End Date Professional Services Professional Services Sector [Member] Professional Services Sector Material Holdings, LLC 1 Material Holdings, LLC 1 [Member] Material Holdings, LLC 1 Investment owned (in shares) Investment Owned, Balance, Shares Borrowings 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Preferred Units [Member] Material+ Holding Company, LLC - Equity - Class B Preferred Units Blackstone Donegal Holdings LP - Equity - LP Interests (Westland Insurance Group LTD) Blackstone Donegal Holdings LP - Equity - LP Interests (Westland Insurance Group LTD) [Member] Blackstone Donegal Holdings LP - Equity - LP Interests (Westland Insurance Group LTD) Change in Unrealized Appreciation (Depreciation) Unrealized Gain (Loss), Derivative and Foreign Currency Transaction Price Change, Operating, before Tax All Award Types Award Type [Domain] Second lien debt Debt Securities, Second Lien [Member] Debt Securities, Second Lien Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Scenario 4 Scenario 4 [Member] Scenario 4 Fair Value Measurements Fair Value Disclosures [Text Block] Aerospace & Defense Aerospace And Defense Sector [Member] Aerospace And Defense Sector Level 3 Fair Value, Inputs, Level 3 [Member] Supplemental information 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Sector Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Incentive fees rate Management and Service Fees, Incentive Rate Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Due to affiliates Increase (Decrease) in Due to Affiliates Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Earnings (loss) per share basic (in usd per share) Earnings (loss) per common share basic (in usd per share) Earnings Per Share, Basic Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Measurement 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(Loss), Investment and Derivative, Operating, after Tax Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Weighted average interest rate all-in Debt, Weighted Average Interest Rate, All In Cost Of Debt Debt, Weighted Average Interest Rate, All In Cost Of Debt Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Unused portion Debt Instrument, Unused Borrowing Capacity, Amount Par Amount Common Stock [Member] Unfunded commitments Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount Material+ Holding Company, LLC - Equity - Class A Units Material+ Holding Company, LLC - Equity - Class A Units [Member] Material+ Holding Company, LLC - Equity - Class A Units Outstanding Principal Long Term Debt, Net Of Eliminations Long 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in Time to MNPI Disclosures, Individual Name Investment, Identifier [Axis] Investment, Identifier [Axis] Diversified Telecommunication Services Diversified Telecommunication Services Sector [Member] Diversified Telecommunication Services Sector Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] April 2028 Notes April 2028 Notes [Member] April 2028 Notes Market Approach Valuation, Market Approach [Member] Offering price per share (in usd per share) Sale of Stock, Price Per Share Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Excise and other taxes paid Excise Taxes Paid Excise Taxes Paid Distributions from net investment income (in usd per share) Investment Company, Distribution to Shareholders, Per Share Incentive rate, catch up, percentage Management And Service Fees, Income Based Incentive Rate, Catch up, Percentage Management And Service Fees, Income Based Incentive Rate, Catch up, Percentage Align Precision Group, LLC 2 Align Precision Group, LLC 2 [Member] Align Precision Group, LLC 2 New ACI Intermediate I, LLC - Second Lien Debt New ACI Intermediate I, LLC - Second Lien Debt [Member] New ACI Intermediate I, LLC - Second Lien Debt Real Estate Management & Development Real Estate Management & Development Sector [Member] Real Estate Management & Development Sector 2.125% Senior Notes Due 2027 2.125% Senior Notes Due 2027 [Member] 2.125% Senior Notes Due 2027 Adjustment to Compensation: Adjustment to Compensation [Axis] Receivable from broker Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Catch-up amount prior to the waiver period Income Based Incentive Fees, Catch-Up Amount, Percentage Income Based Incentive Fees, Catch-Up Amount, Percentage Share Repurchase Program [Axis] Share Repurchase Program [Axis] Variable Rate Scenario [Domain] Variable Rate Scenario [Domain] Variable Rate Scenario [Domain] Hedging Designation [Domain] Hedging Designation [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid during the period Cash paid for interest expense Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] 3.625% Notes Due 2026 3.625% Notes Due 2026 [Member] 3.625% Notes Due 2026 Hedging Designation [Axis] Hedging Designation [Axis] Foreign currency forward contracts Foreign Exchange Forward [Member] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Investments/Receivables/Payables From Investments Sold/Purchased Investment, Policy [Policy Text Block] Name Measure Name First lien debt Debt Securities, First Lien [Member] Debt Securities, First Lien Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid in Capital Additional Paid-in Capital [Member] Entity Filer Category Insurance Insurance Sector [Member] Investments, Unrealized Gain (Loss) Investments, Unrealized Gain (Loss) [Member] Investments, Unrealized Gain (Loss) Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Name Trading Arrangement, Individual Name 5.250% Notes Due 2029 5.250% Notes Due 2029 [Member] 5.250% Notes Due 2029 Cash and Cash Equivalent Cash and cash equivalents Cash and Cash Equivalent Accrued but unpaid debt issuance costs Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Net realized gain (loss): Net Realized Gains (Losses) [Abstract] Net Realized Gains (Losses) Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the condensed consolidated statements of operations Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) SOFR Secured Overnight Financing Rate (SOFR) [Member] Total investment income Gross Investment Income, Operating Commitment Fee Scenario [Axis] Commitment Fee Scenario [Axis] Commitment Fee Scenario Material Holdings, LLC 3 Material Holdings, LLC 3 [Member] Material Holdings, LLC 3 At-the-Market Offering, Offering 2 At-the-Market Offering, Offering 2 [Member] At-the-Market Offering, Offering 2 Derivative liabilities Derivative Liability Investment Portfolio Investment Portfolio [Member] Investment Portfolio Non-PEO NEO Non-PEO NEO [Member] Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One 5.900% Notes Due 2031 5.900% Notes Due 2031 [Member] 5.900% Notes Due 2031 Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Investments, Realized Gain (Loss) Investments, Realized Gain (Loss) [Member] Investments, Realized Gain (Loss) Excise and other tax expense Investment Income, Operating, Tax Expense (Benefit) SMBC Capital Markets, Inc. SMBC Capital Markets, Inc [Member] SMBC Capital Markets, Inc Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Net Realized Gain (Loss) Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Portfolio turnover rate Investment Company, Portfolio Turnover Align Precision Group, LLC 1 Align Precision Group, LLC 1 [Member] Align Precision Group, LLC 1 Notional Derivative Liability, Notional Amount Investment Type Concentration Risk Investment Type Concentration Risk [Member] Investment Type Concentration Risk New ACI Buyer, LLC - First Lien Debt 2 New ACI Buyer, LLC - First Lien Debt 2 [Member] New ACI Buyer, LLC - First Lien Debt 2 Net increase (decrease) in net assets resulting from operations Net increase (decrease) in net assets resulting from operations Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] At-the-Market Offering, Offering At-the-Market Offering, Offering 1 [Member] At-the-Market Offering, Offering 1 Unamortized Debt Issuance Costs (including premiums and discounts) Unamortized Debt Issuance Expense Total Investments [Member] 1 - 3 Years Debt, Long-Term and Short-Term Maturities, Repayments of Principal in Rolling Year One Through Three Debt, Long-Term and Short-Term Maturities, Repayments of Principal in Rolling Year One Through Three Statement [Table] Statement [Table] Debt Securities, Second Lien, Realized Gain (Loss) Debt Securities, Second Lien, Realized Gain (Loss) [Member] Debt Securities, Second Lien, Realized Gain (Loss) Restatement Determination Date: Restatement Determination Date [Axis] Contractual sale restriction, remaining period Investment Company, Equity Security, Contractual Sale Restriction, Remaining Period Interest income Investment Income, Interest Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Assets Subject to Master Netting Agreement Derivative Asset, Subject to Master Netting Arrangement, before Offset Company Pays Derivative, Basis Spread on Variable Rate Derivative instruments, net Increase (Decrease) in Derivative Assets Net change in unrealized (appreciation) depreciation on translation of assets and liabilities in foreign currencies Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Investment income: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Member]