v3.26.1
Investments - Schedule of Composition of Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Cost $ 25,426,426 $ 24,414,425
Total Investments before Cash Equivalents, Fair Value 25,149,083 24,515,628
Total Cash Equivalents, Cost 159,399 227,502
Total Cash Equivalents, Fair Value 159,399 227,502
Total Investments after Cash Equivalents, Cost 25,585,825 24,641,927
Total Investments after Cash Equivalents, Fair Value 25,308,482 24,743,130
Total Assets and Liabilities at Fair Value, Cost 0 24,641,927
Total Assets and Liabilities at Fair Value 80,998 24,780,146
Level 1    
Schedule of Investments [Line Items]    
Total Cash Equivalents, Fair Value 159,399 227,502
Total Investments after Cash Equivalents, Fair Value 159,399 227,502
Total Assets and Liabilities at Fair Value 0 227,502
Level 2    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 4,908,626 5,858,771
Total Investments after Cash Equivalents, Fair Value 4,908,626 5,858,771
Total Assets and Liabilities at Fair Value 80,998 5,895,787
Level 3    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 20,240,457 18,656,857
Total Investments after Cash Equivalents, Fair Value 20,240,457 18,656,857
Total Assets and Liabilities at Fair Value 0 18,656,857
Money Market Fund    
Schedule of Investments [Line Items]    
Total Cash Equivalents, Cost 159,399 227,502
Total Cash Equivalents, Fair Value 159,399 227,502
Money Market Fund | Level 1    
Schedule of Investments [Line Items]    
Total Cash Equivalents, Fair Value 159,399 227,502
First Lien Secured Debt    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Cost 25,253,740 24,310,842
Total Investments before Cash Equivalents, Fair Value 25,007,924 24,441,482
First Lien Secured Debt | Level 2    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 4,888,824 5,843,088
First Lien Secured Debt | Level 3    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 20,119,100 18,598,394
Second Lien Secured Debt    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Cost 33,537 33,700
Total Investments before Cash Equivalents, Fair Value 5,398 5,235
Second Lien Secured Debt | Level 2    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 5,398 5,235
Second Lien Secured Debt | Level 3    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value   35,077
Unsecured Debt    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Cost 64,376 45,544
Total Investments before Cash Equivalents, Fair Value 63,637 45,525
Unsecured Debt | Level 2    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 14,202 10,448
Unsecured Debt | Level 3    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 49,435  
Common Equity/Interests    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Cost 63,579 18,084
Total Investments before Cash Equivalents, Fair Value 61,148 15,993
Common Equity/Interests | Level 2    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 202  
Common Equity/Interests | Level 3    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 60,946 15,993
Preferred Equity    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Cost 11,194 6,255
Total Investments before Cash Equivalents, Fair Value 10,976 7,393
Preferred Equity | Level 3    
Schedule of Investments [Line Items]    
Total Investments before Cash Equivalents, Fair Value 10,976 7,393
Currency Swaps    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 13,476 7,947
Currency Swaps | Level 2    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 13,476 7,947
Interest Rate Swaps    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 23,522 56,888
Interest Rate Swaps | Level 2    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 23,522 56,888
Options (Swaptions and Binary Options)    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 7,031  
Options (Swaptions and Binary Options) | Level 2    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 7,031  
Foreign Exchange Forward Transactions    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value 36,969 (27,819)
Foreign Exchange Forward Transactions | Level 2    
Schedule of Investments [Line Items]    
Total Assets and Liabilities at Fair Value $ 36,969 $ (27,819)