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FINANCIAL HIGHLIGHTS - Financial Highlights (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net asset value, beginning of period (in dollars per share) | $ 19.24 | $ 18.40 | $ 18.96 | $ 16.97 | $ 17.32 | $ 17.12 | $ 16.65 | $ 16.45 | $ 16.46 | $ 16.82 |
Issuances of common stock (in dollars per share) | 0.12 | 0.01 | 0.10 | 0.11 | 0 | 0.02 | 0 |  | 0 | 0.01 |
Issuances of common stock (in dollars per share) |  |  |  |  |  |  |  | (0.01) |  |  |
Conversion of 2024 Convertible Notes (in dollars per share) | 0.01 | 0 | 0 | 0 | 0 | 0 | 0 | 0.04 | 0 | 0 |
Repurchases of common stock (in dollars per share) | 0 | 0 | 0 | 0 | 0.11 | 0 | 0 | 0 | 0 |  |
Repurchases of common stock (in dollars per share) |  |  |  |  |  |  |  |  |  | (0.01) |
Deemed contribution from Ares Capital Management (in dollars per share) |  |  |  |  |  | 0 | 0 | 0.13 | 0 | 0 |
Net investment income for period (in dollars per share) | 2.25 | 2.28 | 2.19 | 1.66 | 1.87 | 1.90 | 1.63 | 1.20 | 1.57 | 1.62 |
Net realized and unrealized gains (losses) for period (in dollars per share) | 0.19 | 0.47 | (0.98) | 1.84 | (0.73) | (0.04) | 0.38 | 0.36 | (0.06) | (0.41) |
Net increase in stockholders' equity resulting from operations (in dollars per share) | 2.57 | 2.76 | 1.31 | 3.61 | 1.25 | 1.88 | 2.01 | 1.72 | 1.51 | 1.21 |
Total distributions to stockholders (in dollars per share) | (1.92) | (1.92) | (1.87) | (1.62) | (1.60) | (1.68) | (1.54) | (1.52) | (1.52) | (1.57) |
Net asset value, end of period (in dollars per share) | 19.89 | 19.24 | 18.40 | 18.96 | 16.97 | 17.32 | 17.12 | 16.65 | 16.45 | 16.46 |
Per share market value at end of period (in dollars per share) | $ 21.89 | $ 20.03 | $ 18.47 | $ 21.19 | $ 16.89 | $ 18.65 | $ 15.58 | $ 15.72 | $ 16.49 | $ 14.25 | $ 15.61
Total return based on market value | 19.80% | 19.94% | (3.83%) | 36.18% | (0.86%) | 30.49% | 8.91% | 4.55% | 26.39% | 1.35% |
Total return based on net asset value | 13.83% | 15.65% | 7.13% | 21.97% | 5.20% | 12.14% | 12.10% | 10.53% | 9.15% | 7.16% |
Shares outstanding at end of period (in shares) | 672 | 582 | 519 | 468 | 423 | 431 | 426 | 426 | 314 | 314 |
Ratio/Supplemental Data: |  |  |  |  |  |  |  |  |  |  |
Net assets at end of period | $ 13,355 | $ 11,201 | $ 9,555 | $ 8,868 | $ 7,176 | $ 7,467 | $ 7,300 | $ 7,098 | $ 5,165 | $ 5,173 |
Ratio of operating expenses to average net assets | 12.26% | 12.78% | 10.19% | 13.05% | 10.27% | 9.92% | 8.63% | 9.45% | 9.59% | 9.51% |
Ratio of net investment income to average net assets | 11.10% | 12.10% | 11.73% | 9.19% | 11.39% | 11.01% | 9.60% | 7.65% | 9.58% | 9.75% |
Portfolio turnover rate | 39.00% | 26.00% | 37.00% | 60.00% | 40.00% | 38.00% | 54.00% | 51.00% | 39.00% | 42.00% |

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