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Investments - Investment Portfolio at Cost and Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]      
Cost   $ 13,932,697 $ 13,193,219
Fair Value   $ 13,809,636 $ 13,092,518
Investment Owned, At Fair Value | Investment Type Concentration Risk      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 100.00% 100.00% 100.00%
First lien debt      
Schedule of Investments [Line Items]      
Cost   $ 13,614,961 [1],[2],[3] $ 12,959,332 [4],[5],[6]
Fair Value   $ 13,469,751 [1],[2] $ 12,830,389 [4],[6]
First lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage   97.50% 98.00%
Second lien debt      
Schedule of Investments [Line Items]      
Cost   $ 227,625 [1],[2],[3] $ 122,634 [4],[5],[6]
Fair Value   $ 226,249 [1],[2] $ 119,184 [4],[6]
Second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage   1.70% 0.90%
Unsecured debt      
Schedule of Investments [Line Items]      
Cost   $ 14,507 [1],[2],[3] $ 33,644 [4],[5],[6]
Fair Value   $ 13,991 [1],[2] $ 33,521 [4],[6]
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage   0.10% 0.30%
Equity      
Schedule of Investments [Line Items]      
Cost   $ 75,604 [1],[2],[3] $ 77,609 [4],[5],[6]
Fair Value   $ 99,645 [1],[2] $ 109,424 [4],[6]
Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage   0.70% 0.80%
[1] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Condensed Consolidated Schedule of Investments) are denominated in U.S. dollars. As of September 30, 2025, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), Norwegian Krone (NOK), and Australian Dollars (AUD). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[2] All securities are exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”), excluding Axsome Therapeutics, Inc. - Common Stock, and may be deemed to be “restricted securities.” As of September 30, 2025, the aggregate fair value of these securities is $13,808.0 million or 220.23% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[3] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
[4] All securities are exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”), and may be deemed to be “restricted securities.” As of December 31, 2024, the aggregate fair value of these securities is $13,092.5 million or 215.43% of the Company’s net assets. The initial acquisition dates have been included for such securities.
[5] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
[6] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Condensed Consolidated Schedule of Investments) are denominated in dollars. As of December 31, 2024, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), Norwegian Krone (NOK), and Australian Dollars (AUD). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.