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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Total investments at fair value |  | $ 2,505,992,000 | [1] |  | $ 2,505,992,000 | [1] | $ 2,448,935,000 | [2]
Interest | [2],[3],[4],[5] |  |  |  |  |  | 8.80% |
Percent of net assets |  | 207.50% | [1] |  | 207.50% | [1] | 205.40% | [2]
Non-qualifying assets |  | 26.50% |  |  | 26.50% |  | 25.90% |
Credit support agreements |  | $ 1,978,000 |  |  | $ 7,564,000 |  |  |
MVC Credit Support Agreement |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Credit support agreements |  |  |  |  | 2,050,000 |  | $ (1,214,000) |
MVC Credit Support Agreement | Barings LLC |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Credit support agreements |  |  |  | $ (1,214,000) | 2,050,000 |  | (1,214,000) |
MVC Private Equity Fund LP |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Total investments at fair value |  | 1,487,000 | [1] |  | 1,487,000 | [1] | 1,838,000 | [2]
Control investments |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Total investments at fair value |  | $ 106,958,000 | [1] |  | $ 106,958,000 | [1] | $ 106,328,000 | [2]
Percent of net assets |  | 8.90% | [1] |  | 8.90% | [1] | 8.90% | [2]
Control investments | MVC Private Equity Fund LP |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Total investments at fair value |  | $ 1,487,000 |  |  | $ 1,487,000 |  | $ 1,838,000 |
Control investments | MVC Private Equity Fund LP | General Partner |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Partners' capital account, return of capital |  |  |  | 100,000,000 |  |  |  |
Control investments | MVC Private Equity Fund LP | Limited Partner |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Partners' capital account, return of capital |  |  |  | $ 6,000,000,000.0 |  |  |  |
February 21, 2019 | Line of Credit |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Commitment aggregate amount |  | $ 1,100,000,000 |  |  | $ 1,100,000,000 |  | $ 1,100,000,000 |
[1] | All of the investment is or will be encumbered as security for the Company’s $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] | All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.
[3] | Debt investment includes interest rate floor feature.
[4] | The fair value of the investment was determined using significant unobservable inputs.
[5] | The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.

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