Borrowings - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Debt Disclosure [Abstract] | |||||
| Asset coverage ratio | 221.30% | 221.30% | 235.70% | ||
| Interest expense, payable | $ 508.2 | $ 508.2 | $ 424.2 | ||
| Unused borrowing capacity fee payable | $ 5.7 | $ 5.7 | $ 3.9 | ||
| Weighted average interest rate | 5.54% | 6.20% | 5.53% | 6.15% | |
| Weighted average interest rate all-in | 5.66% | 6.31% | 5.66% | 6.26% | |
| Deferred financing costs written off | $ 0.5 | $ 0.0 | $ 5.7 | $ 0.0 | |
| Average amount outstanding | $ 35,890.4 | $ 29,973.3 | $ 35,988.8 | $ 30,444.0 | |