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Investments (Details)
€ in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2023
EUR (€)
Schedule of Investments [Line Items]        
Cost $ 3,158,601 $ 2,939,646 [1] $ 2,373,435  
Fair Value $ 3,123,450 2,873,588 2,387,374  
Investment Owned at Fair Value        
Schedule of Investments [Line Items]        
Cost   2,939,646 2,373,435  
Fair Value   $ 2,873,588 $ 2,387,374  
Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 100.00% 100.00% 100.00%  
Australia        
Schedule of Investments [Line Items]        
Cost $ 10,151 $ 10,187    
Fair Value $ 10,168 $ 9,870    
Australia | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.30% 0.30%    
Canada        
Schedule of Investments [Line Items]        
Cost $ 97,187 $ 108,820 $ 81,935  
Fair Value $ 96,518 $ 105,764 $ 81,386  
Canada | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 3.10% 3.70% 3.40%  
United Kingdom        
Schedule of Investments [Line Items]        
Cost $ 11,848 $ 11,157 $ 17,804  
Fair Value $ 12,088 $ 11,157 $ 18,200  
United Kingdom | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.40% 0.40% 0.80%  
United States        
Schedule of Investments [Line Items]        
Cost $ 3,039,415 $ 2,809,482 $ 2,273,696  
Fair Value $ 3,004,676 $ 2,746,797 $ 2,287,788  
United States | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 96.20% 95.60% 95.80%  
Aerospace & Defense | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.70% 1.80% 1.70%  
Air Freight & Logistics | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.10% 1.10% 0.50%  
Automobile Components | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 3.60% 3.80% 3.30%  
Automobiles | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 4.90% 5.10% 7.40%  
Biotechnology | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.50% 0.50% 0.60%  
Chemicals | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.70% 0.60%    
Containers & Packaging | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.50% 1.60% 1.60%  
Commercial Services & Supplies | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 10.30% 11.20% 13.00%  
Construction & Engineering | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.50% 1.30% 1.50%  
Distributors | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 2.80% 4.20% 1.20%  
Diversified Consumer Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 3.30% 3.00% 1.50%  
Electronic Equipment, Instruments & Components | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.50% 1.00% 0.70%  
Energy Equipment & Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.50% 0.50% 0.60%  
Diversified Financial Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.70% 0.70% 0.10%  
Food Products | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 2.30% 2.50% 3.10%  
Health Care Equipment & Supplies        
Schedule of Investments [Line Items]        
Cost [2] $ 5,415      
Fair Value $ 5,374      
Health Care Equipment & Supplies | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.40% 0.30% 0.40%  
Health Care Providers & Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 3.80% 3.40% 2.90%  
Health Care Technology | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 2.00% 0.70% 0.90%  
Industrial Conglomerates | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.30% 0.20% 1.80%  
Insurance Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 14.90% 15.70% 17.10%  
Interactive Media & Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 3.20% 3.50% 3.80%  
IT Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 8.80% 9.60% 10.80%  
Leisure Products | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.70% 0.80% 2.40%  
Machinery | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 2.70% 3.00% 2.00%  
Multi-Utilities | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.70% 0.60% 0.40%  
Oil, Gas & Consumable Fuels | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.00% 0.00%    
Pharmaceuticals | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 0.40% 0.40%    
Professional Services | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 3.60% 3.20% 4.00%  
Real Estate Management & Development | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 5.30% 5.40% 5.20%  
Software | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 14.30% 14.30% 11.50%  
First Lien Debt        
Schedule of Investments [Line Items]        
Cost $ 2,960,107 $ 2,753,620 $ 2,213,332 [1] € 2,960,107 [2]
Fair Value $ 2,933,870 $ 2,694,111 $ 2,224,100 2,933,870
First Lien Debt | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 93.90% 93.80% 93.20%  
First Lien Debt | Aerospace & Defense        
Schedule of Investments [Line Items]        
Cost $ 52,573 [2] $ 52,520 [2] $ 38,993 [1]  
Fair Value 52,676 51,531 39,370  
First Lien Debt | Air Freight & Logistics        
Schedule of Investments [Line Items]        
Cost 29,679 [2] 28,736 [2] 11,948 [1]  
Fair Value 29,888 27,943 11,948  
First Lien Debt | Automobile Components        
Schedule of Investments [Line Items]        
Cost 86,866 [2] 86,480 [2] 51,698 [1]  
Fair Value 86,506 83,574 51,746  
First Lien Debt | Automobiles        
Schedule of Investments [Line Items]        
Cost 154,223 150,144 [3] 174,783 [1]  
Fair Value 154,132 146,413 175,583  
First Lien Debt | Biotechnology        
Schedule of Investments [Line Items]        
Cost 15,611 14,830 [3] 14,955 [1]  
Fair Value 15,603 14,407 14,955  
First Lien Debt | Chemicals        
Schedule of Investments [Line Items]        
Cost 21,087 18,797 [3]    
Fair Value 20,783 18,066    
First Lien Debt | Containers & Packaging        
Schedule of Investments [Line Items]        
Cost 43,385 43,852 [3] 36,043 [1]  
Fair Value 43,525 42,522 36,043  
First Lien Debt | Commercial Services & Supplies        
Schedule of Investments [Line Items]        
Cost 320,119 325,020 [1],[2] 306,205 [1]  
Fair Value 319,668 319,508 307,450  
First Lien Debt | Construction & Engineering        
Schedule of Investments [Line Items]        
Cost 45,942 37,932 [3] 35,799 [1]  
Fair Value 45,890 36,734 35,799  
First Lien Debt | Distributors        
Schedule of Investments [Line Items]        
Cost 90,110 122,968 [3] 28,636 [1]  
Fair Value 87,337 120,982 28,636  
First Lien Debt | Diversified Consumer Services        
Schedule of Investments [Line Items]        
Cost 103,850 88,142 [3] 36,642 [1]  
Fair Value 103,167 87,147 36,975  
First Lien Debt | Electronic Equipment, Instruments & Components        
Schedule of Investments [Line Items]        
Cost 26,500 13,448 [3]    
Fair Value 25,815 12,892    
First Lien Debt | Diversified Financial Services        
Schedule of Investments [Line Items]        
Cost 53,913 19,820 [3] 71,968 [1]  
Fair Value 54,126 19,586 72,070  
First Lien Debt | Health Care Equipment & Supplies        
Schedule of Investments [Line Items]        
Cost 13,052   62,269 [1]  
Fair Value 13,090   62,602  
First Lien Debt | Health Care Providers & Services        
Schedule of Investments [Line Items]        
Cost 111,559 90,686    
Fair Value 110,086 88,460    
First Lien Debt | Health Care Technology        
Schedule of Investments [Line Items]        
Cost 61,214 21,467 21,562 [1]  
Fair Value 61,389 21,148 20,963  
First Lien Debt | Industrial Conglomerates        
Schedule of Investments [Line Items]        
Cost 33,628 1,666 [1] 35,958  
Fair Value 34,407 1,612 36,285  
First Lien Debt | Insurance Services        
Schedule of Investments [Line Items]        
Cost 466,713 455,293 401,473  
Fair Value 460,888 446,804 403,895  
First Lien Debt | Interactive Media & Services        
Schedule of Investments [Line Items]        
Cost 104,614 103,429 90,189  
Fair Value 100,966 101,077 91,025  
First Lien Debt | IT Services        
Schedule of Investments [Line Items]        
Cost 227,038 230,561 201,890  
Fair Value 220,202 223,366 202,960  
First Lien Debt | Leisure Products        
Schedule of Investments [Line Items]        
Cost 21,596 21,726 54,292 [1]  
Fair Value 21,214 21,557 54,900  
First Lien Debt | Machinery        
Schedule of Investments [Line Items]        
Cost 84,669 88,999 48,582 [1]  
Fair Value 83,742 85,464 48,133  
First Lien Debt | Multi-Utilities        
Schedule of Investments [Line Items]        
Cost 21,738 16,427 [1] 10,405 [1]  
Fair Value 21,760 16,228 10,600  
First Lien Debt | Oil, Gas & Consumable Fuels        
Schedule of Investments [Line Items]        
Cost [1]   399    
Fair Value   390    
First Lien Debt | Pharmaceuticals        
Schedule of Investments [Line Items]        
Cost 11,848 11,157 [1]    
Fair Value 12,088 11,157    
First Lien Debt | Professional Services        
Schedule of Investments [Line Items]        
Cost 110,638 89,714 [1] 91,547 [1]  
Fair Value 110,995 88,770 92,207  
First Lien Debt | Real Estate Management & Development        
Schedule of Investments [Line Items]        
Cost 163,130 [2] 155,654 [2] 121,237  
Fair Value 162,420 152,029 122,965  
First Lien Debt | Software        
Schedule of Investments [Line Items]        
Cost   381,883 252,416 [1] 412,722 [2]
Fair Value   374,792 252,952 € 410,701
Second Lien Debt        
Schedule of Investments [Line Items]        
Cost 145,809 [2] 136,620 [1] 120,124  
Fair Value $ 134,712 $ 128,350 $ 121,550  
Second Lien Debt | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 4.30% 4.50% 5.10%  
Second Lien Debt | Electronic Equipment, Instruments & Components        
Schedule of Investments [Line Items]        
Cost   $ 16,939 $ 16,912 [1]  
Fair Value   16,194 17,000  
Second Lien Debt | Health Care Providers & Services        
Schedule of Investments [Line Items]        
Cost   5,318    
Fair Value   4,946    
Second Lien Debt | Industrial Conglomerates        
Schedule of Investments [Line Items]        
Cost [1]     39,944  
Fair Value     40,387  
Second Lien Debt | IT Services        
Schedule of Investments [Line Items]        
Cost $ 40,072 [2] 40,016 [1]    
Fair Value 37,804 37,735    
Second Lien Debt | Software        
Schedule of Investments [Line Items]        
Cost 23,801 [2] 23,770 [1] 120,124 [1]  
Fair Value 19,963 22,341 121,550  
Other Securities        
Schedule of Investments [Line Items]        
Cost 52,685 [2] 49,406 [1] 39,979  
Fair Value $ 54,868 $ 51,127 $ 41,724  
Other Securities | Investment Owned at Fair Value | Investment Type Concentration Risk        
Schedule of Investments [Line Items]        
% of Total Investments at Fair Value 1.80% 1.70% 1.70%  
[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.
[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.
[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.