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Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Amortized cost $ 15,113,516 [1],[2],[3],[4] $ 16,417,779 [5],[6],[7],[8]
Restricted cash 20,399 47,448
Foreign cash, cost 625 9,722
Unamortized debt issuance costs $ 101,772 $ 93,186
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, shares issued (in shares) 493,142,569 499,448,499
Common stock, shares outstanding (in shares) 493,142,569 499,448,499
Non-controlled, non-affiliated investments    
Amortized cost $ 12,793,396 [2],[4] $ 14,060,097 [6],[7]
Non-controlled, affiliated investments    
Amortized cost 190,543 [2],[4] 176,078 [6],[7]
Controlled, affiliated investments    
Amortized cost $ 2,129,577 [2],[4] $ 2,181,604 [6],[7]
[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.”