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Investments - Schedule of Investments at Fair Value and Amortized Cost (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 15,113,516 | [1],[2],[3],[4] | $ 16,417,779 | [5],[6],[7],[8]
Fair Value | 14,955,049 | [1],[3] | 16,470,893 | [5],[8]
First-lien senior secured debt investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 11,202,149 |  | 12,215,994 |
Fair Value | 10,937,849 |  | 12,048,934 |
Second-lien senior secured debt investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 931,923 |  | 975,790 |
Fair Value | 674,223 |  | 848,575 |
Unsecured debt investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 367,689 |  | 384,569 |
Fair Value | 377,224 |  | 399,962 |
Specialty finance debt investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 170,984 |  | 157,004 |
Fair Value | 171,254 |  | 157,297 |
Preferred equity investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 308,544 |  | 592,714 |
Fair Value | 262,536 |  | 568,977 |
Common equity investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 460,949 |  | 473,881 |
Fair Value | 714,693 |  | 644,304 |
Specialty finance equity investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 1,238,485 |  | 1,195,614 |
Fair Value | 1,426,590 |  | 1,386,739 |
Joint ventures |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 432,793 |  | 422,213 |
Fair Value | $ 390,680 |  | $ 416,105 |
[1] | Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s restricted securities.
[2] | The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.
[3] | Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5 — Debt.”
[4] | As of June 30, 2026, the net estimated unrealized loss for U.S. federal income tax purposes was $274.6 million based on a tax cost basis of $15.23 billion. As of June 30, 2026, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $748.9 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $474.3 million
[5] | Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s restricted securities.
[6] | The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.
[7] | As of December 31, 2025, the net estimated unrealized loss for U.S. federal income tax purposes was $26.6 million based on a tax cost basis of $16.60 billion. As of December 31, 2025, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $572.2 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $545.6 million.
[8] | Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5 — Debt.”

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