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Investments - Geographic Investment (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 11,330,469 $ 9,934,159
Fair Value $ 11,293,797 $ 9,868,440
Fair Value as % of Net Assets 209.30% 199.30%
Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
United States    
Schedule of Investments [Line Items]    
Cost $ 10,439,866 $ 9,381,707
Fair Value $ 10,411,725 $ 9,317,684
Fair Value as % of Net Assets 193.00% 188.20%
United States | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Concentration Risk, Percentage 92.20% 94.40%
Canada    
Schedule of Investments [Line Items]    
Cost $ 283,618 $ 275,579
Fair Value $ 287,155 $ 278,103
Fair Value as % of Net Assets 5.30% 5.60%
Canada | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Concentration Risk, Percentage 2.50% 2.80%
Bermuda/Cayman Islands    
Schedule of Investments [Line Items]    
Cost $ 436 $ 436
Fair Value $ 569 $ 473
Fair Value as % of Net Assets 0.00% 0.00%
Bermuda/Cayman Islands | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Concentration Risk, Percentage 0.00% 0.00%
Europe    
Schedule of Investments [Line Items]    
Cost $ 605,908 $ 276,437
Fair Value $ 593,697 $ 272,180
Fair Value as % of Net Assets 11.00% 5.50%
Europe | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Concentration Risk, Percentage 5.30% 2.80%
Asia    
Schedule of Investments [Line Items]    
Cost $ 641  
Fair Value $ 651  
Fair Value as % of Net Assets 0.00%  
Asia | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Concentration Risk, Percentage 0.00%