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Portfolio Company Investments - Schedule of Portfolio Composition by Type And by Geographic Region at Fair Value (Details) | Sep. 30, 2023 | Dec. 31, 2022
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Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 169.00% | [1],[2],[3] | 179.10% | [4],[5],[6]
United States Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 26.80% |  | 37.60% |
United States Southeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 53.70% |  | 55.40% |
United States Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 27.90% |  | 26.50% |
United States West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 30.50% |  | 31.50% |
United States Southwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 27.80% |  | 25.50% |
Canada |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 2.30% |  | 2.60% |
First Lien Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 95.20% |  | 95.00% |
Second Lien Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 28.20% |  | 38.10% |
Subordinated Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 22.10% |  | 21.10% |
Equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 22.80% |  | 24.50% |
Warrants |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Total net assets percentage | 0.70% |  | 0.40% |
[1] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[2] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[3] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.
[4] | (a) See Note 3 to the consolidated financial statements for portfolio composition by geographic location.
[5] | (b) Equity ownership may be held in shares or units of companies related to the portfolio companies.
[6] | (c) All debt investments are income producing, unless otherwise indicated. Equity investments are non-income producing unless otherwise noted.

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