Quarterly report pursuant to Section 13 or 15(d)

Investments - Geographic Composition of Investments (Details)

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Investments - Geographic Composition of Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 10,984,581 [1] $ 9,203,801 [2]
Fair Value $ 11,122,205 $ 9,289,410
% of Total Investments at Fair Value 100.00% 100.00%
Fair Value as a % of Net Assets 156.93% 179.15%
Australia    
Schedule of Investments [Line Items]    
Amortized Cost $ 183,892 $ 264,309
Fair Value $ 188,000 $ 266,377
% of Total Investments at Fair Value 1.69% 2.87%
Fair Value as a % of Net Assets 2.65% 5.14%
Austria    
Schedule of Investments [Line Items]    
Amortized Cost $ 87,141  
Fair Value $ 88,592  
% of Total Investments at Fair Value 0.80%  
Fair Value as a % of Net Assets 1.25%  
Canada    
Schedule of Investments [Line Items]    
Amortized Cost $ 87,863 $ 78,148
Fair Value $ 86,794 $ 77,962
% of Total Investments at Fair Value 0.78% 0.84%
Fair Value as a % of Net Assets 1.22% 1.50%
France    
Schedule of Investments [Line Items]    
Amortized Cost $ 81,567 $ 35,514
Fair Value $ 84,378 $ 37,969
% of Total Investments at Fair Value 0.76% 0.41%
Fair Value as a % of Net Assets 1.19% 0.73%
Germany    
Schedule of Investments [Line Items]    
Amortized Cost $ 118,409 $ 68,533
Fair Value $ 120,499 $ 71,499
% of Total Investments at Fair Value 1.08% 0.77%
Fair Value as a % of Net Assets 1.70% 1.38%
Italy    
Schedule of Investments [Line Items]    
Amortized Cost $ 128,023 $ 127,737
Fair Value $ 132,633 $ 137,270
% of Total Investments at Fair Value 1.19% 1.48%
Fair Value as a % of Net Assets 1.87% 2.65%
Luxembourg    
Schedule of Investments [Line Items]    
Amortized Cost $ 6,960  
Fair Value $ 7,032  
% of Total Investments at Fair Value 0.06%  
Fair Value as a % of Net Assets 0.10%  
Norway    
Schedule of Investments [Line Items]    
Amortized Cost $ 21,197 $ 24,920
Fair Value $ 21,197 $ 24,957
% of Total Investments at Fair Value 0.19% 0.27%
Fair Value as a % of Net Assets 0.30% 0.48%
Singapore    
Schedule of Investments [Line Items]    
Amortized Cost $ 32,488 $ 31,713
Fair Value $ 32,767 $ 32,862
% of Total Investments at Fair Value 0.29% 0.35%
Fair Value as a % of Net Assets 0.46% 0.63%
Spain    
Schedule of Investments [Line Items]    
Amortized Cost $ 31,598 $ 31,515
Fair Value $ 32,516 $ 33,196
% of Total Investments at Fair Value 0.29% 0.36%
Fair Value as a % of Net Assets 0.46% 0.64%
Taiwan    
Schedule of Investments [Line Items]    
Amortized Cost $ 48,360 $ 46,557
Fair Value $ 44,768 $ 40,359
% of Total Investments at Fair Value 0.40% 0.43%
Fair Value as a % of Net Assets 0.63% 0.78%
United Kingdom    
Schedule of Investments [Line Items]    
Amortized Cost $ 738,239 $ 426,120
Fair Value $ 754,872 $ 444,188
% of Total Investments at Fair Value 6.79% 4.78%
Fair Value as a % of Net Assets 10.65% 8.57%
United States    
Schedule of Investments [Line Items]    
Amortized Cost $ 9,418,844 $ 8,068,735
Fair Value $ 9,528,157 $ 8,122,771
% of Total Investments at Fair Value 85.68% 87.44%
Fair Value as a % of Net Assets 134.45% 156.65%
[1] 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 ("U.S. GAAP").
[2] 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 ("U.S. GAAP").