Income Taxes - Schedule of Aggregate Unrealized Appreciation of Company investment Federal Income Tax (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| Aggregate gross unrealized appreciation | $ 90.1 | $ 107.0 |
| Aggregate gross unrealized depreciation | 139.7 | 109.4 |
| Net unrealized appreciation (depreciation) over cost for U.S. federal income tax purposes | (49.6) | (2.4) |
| Aggregate cost of securities for U.S. federal income tax purposes (in billions) | $ 4,800.0 | $ 4,500.0 |