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Financial Highlights - Summary of Information about Senior Securities (Parenthetical) (Details) - USD ($) |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 19, 2024 | Mar. 28, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2024
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Asset coverage per unit measure per dollar |  |  | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000 |
Outstanding debt |  |  | 1,061,300,000 |  |  |  |  |  | $ 772,200,000
2025 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Average daily price of notes |  |  | $ 1,000,000 |  |  |  |  |  |
Debt instrument, maturity date |  |  | Jan. 16, 2025 |  |  |  |  |  |
March 2029 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Average daily price of notes |  |  | $ 1,000,000 |  |  |  |  |  |
Debt instrument, maturity date |  | Mar. 30, 2029 |  |  |  |  |  |  |
September 2029 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Average daily price of notes |  |  | $ 1,000,000 |  |  |  |  |  |
Debt instrument, maturity date | Sep. 30, 2029 |  |  |  |  |  |  |  |

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