Investments - Investment Portfolio at Cost and Fair Value (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | ||||||||||||||
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Sep. 30, 2026 |
Dec. 31, 2025 |
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| Schedule of Investments [Line Items] | ||||||||||||||||
| Cost | $ 13,250,120 | $ 14,387,967 | ||||||||||||||
| Fair Value | $ 12,946,234 | $ 14,207,294 | ||||||||||||||
| Investment Owned, At Fair Value | Investment Type Concentration Risk | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Concentration Risk, Percentage | 100.00% | 100.00% | ||||||||||||||
| First lien debt | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Cost | $ 12,712,762 | [1],[2],[3] | $ 14,066,122 | [4],[5],[6] | ||||||||||||
| Fair Value | $ 12,408,691 | [1],[3] | $ 13,866,434 | [4],[6] | ||||||||||||
| First lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Concentration Risk, Percentage | 95.80% | 97.60% | ||||||||||||||
| Second lien debt | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Cost | $ 258,539 | [1],[2],[3] | $ 232,448 | [4],[5],[6] | ||||||||||||
| Fair Value | $ 252,721 | [1],[3] | $ 231,650 | [4],[6] | ||||||||||||
| Second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Concentration Risk, Percentage | 2.00% | 1.60% | ||||||||||||||
| Unsecured debt | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Cost | $ 15,035 | [1],[2],[3] | $ 13,049 | |||||||||||||
| Fair Value | $ 12,498 | [1],[3] | $ 12,278 | |||||||||||||
| Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Concentration Risk, Percentage | 0.10% | 0.10% | ||||||||||||||
| Equity | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Cost | $ 263,784 | [1],[2],[3] | $ 76,348 | [4],[5],[6] | ||||||||||||
| Fair Value | $ 272,324 | [1],[3] | $ 96,932 | [4],[6] | ||||||||||||
| Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk | ||||||||||||||||
| Schedule of Investments [Line Items] | ||||||||||||||||
| Concentration Risk, Percentage | 2.10% | 0.70% | ||||||||||||||
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Cost of the investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Fair value of investment in security owned. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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