v3.26.1
Investments (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]    
Amortized Cost $ 21,360,914,400 $ 11,482,053,000
Fair Value $ 21,508,598,400 11,549,149,400
Loans on non-accrual status, as a percent of total investments at amortized cost 0.1  
Loans on non-accrual status, as a percent of total investments at fair value 0.1  
Software and Services    
Schedule of Investments [Line Items]    
Amortized Cost $ 4,696,255,400 2,468,993,900
Fair Value 4,725,434,100 2,483,602,500
Health Care Equipment and Services    
Schedule of Investments [Line Items]    
Amortized Cost 2,368,817,900 1,065,043,800
Fair Value 2,368,334,500 1,070,024,600
Commercial and Professional Services    
Schedule of Investments [Line Items]    
Amortized Cost 1,865,620,500 839,395,200
Fair Value 1,849,522,600 847,225,600
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Amortized Cost 1,841,282,500 478,416,900
Fair Value 1,826,970,400 483,169,200
Capital Goods    
Schedule of Investments [Line Items]    
Amortized Cost 1,663,903,600 1,019,076,300
Fair Value 1,661,724,000 1,020,854,400
Consumer Services    
Schedule of Investments [Line Items]    
Amortized Cost   994,645,700
Fair Value   1,004,126,500
Sports, Media and Entertainment    
Schedule of Investments [Line Items]    
Amortized Cost 776,717,900 662,924,300
Fair Value 817,462,800 666,185,200
Pharmaceuticals, Biotechnology and Life Sciences    
Schedule of Investments [Line Items]    
Amortized Cost 656,406,200 547,352,200
Fair Value 665,524,700 548,098,500
Consumer Distribution and Retail    
Schedule of Investments [Line Items]    
Amortized Cost 631,418,900 307,292,600
Fair Value 634,669,100 312,991,500
Independent Power and Renewable Electricity Producers    
Schedule of Investments [Line Items]    
Amortized Cost 465,809,300 86,804,200
Fair Value 514,233,000 86,939,700
Materials    
Schedule of Investments [Line Items]    
Amortized Cost 370,039,800 267,311,200
Fair Value $ 355,083,900 $ 262,069,900
Investments, At Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 100.00% 100.00%
Investments, At Fair Value | Industry Concentration Risk | Software and Services    
Schedule of Investments [Line Items]    
Composition, percent of fair value 22.00% 21.50%
Investments, At Fair Value | Industry Concentration Risk | Health Care Equipment and Services    
Schedule of Investments [Line Items]    
Composition, percent of fair value 11.00% 9.30%
Investments, At Fair Value | Industry Concentration Risk | Commercial and Professional Services    
Schedule of Investments [Line Items]    
Composition, percent of fair value 8.60% 7.30%
Investments, At Fair Value | Industry Concentration Risk | Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Composition, percent of fair value 8.50% 4.20%
Investments, At Fair Value | Industry Concentration Risk | Capital Goods    
Schedule of Investments [Line Items]    
Composition, percent of fair value 7.70% 8.80%
Investments, At Fair Value | Industry Concentration Risk | Financial Services    
Schedule of Investments [Line Items]    
Composition, percent of fair value 6.70% 6.70%
Investments, At Fair Value | Industry Concentration Risk | Consumer Services    
Schedule of Investments [Line Items]    
Composition, percent of fair value 6.00% 8.70%
Investments, At Fair Value | Industry Concentration Risk | Insurance    
Schedule of Investments [Line Items]    
Composition, percent of fair value 5.10% 6.30%
Investments, At Fair Value | Industry Concentration Risk | Sports, Media and Entertainment    
Schedule of Investments [Line Items]    
Composition, percent of fair value 3.80% 5.80%
Investments, At Fair Value | Industry Concentration Risk | Pharmaceuticals, Biotechnology and Life Sciences    
Schedule of Investments [Line Items]    
Composition, percent of fair value 3.10% 4.70%
Investments, At Fair Value | Industry Concentration Risk | Consumer Distribution and Retail    
Schedule of Investments [Line Items]    
Composition, percent of fair value 3.00% 2.70%
Investments, At Fair Value | Industry Concentration Risk | Independent Power and Renewable Electricity Producers    
Schedule of Investments [Line Items]    
Composition, percent of fair value 2.40% 0.70%
Investments, At Fair Value | Industry Concentration Risk | Energy    
Schedule of Investments [Line Items]    
Composition, percent of fair value 1.90% 1.30%
Investments, At Fair Value | Industry Concentration Risk | Transportation    
Schedule of Investments [Line Items]    
Composition, percent of fair value 1.70% 1.30%
Investments, At Fair Value | Industry Concentration Risk | Materials    
Schedule of Investments [Line Items]    
Composition, percent of fair value 1.70% 2.30%
Investments, At Fair Value | Industry Concentration Risk | Other    
Schedule of Investments [Line Items]    
Composition, percent of fair value 6.80% 8.40%
Investments, At Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Composition, percent of fair value 100.00% 100.00%
Investments, At Fair Value | Geographic Concentration Risk | United States    
Schedule of Investments [Line Items]    
Composition, percent of fair value 86.70% 90.30%
Investments, At Fair Value | Geographic Concentration Risk | Europe    
Schedule of Investments [Line Items]    
Composition, percent of fair value 7.50% 5.50%
Investments, At Fair Value | Geographic Concentration Risk | Bermuda/Cayman Islands    
Schedule of Investments [Line Items]    
Composition, percent of fair value 4.50% 2.90%
Investments, At Fair Value | Geographic Concentration Risk | Canada    
Schedule of Investments [Line Items]    
Composition, percent of fair value 1.30% 1.20%
Investments, At Fair Value | Geographic Concentration Risk | Other    
Schedule of Investments [Line Items]    
Composition, percent of fair value   0.10%
First lien senior secured loans    
Schedule of Investments [Line Items]    
Amortized Cost $ 17,143,966,000 $ 10,092,681,000
Fair Value 17,160,266,000 10,130,307,000
Second lien senior secured loans    
Schedule of Investments [Line Items]    
Amortized Cost 430,463,000 157,058,000
Fair Value 429,160,000 158,500,000
Senior subordinated loans    
Schedule of Investments [Line Items]    
Amortized Cost 1,003,023,000 214,927,000
Fair Value 1,068,842,000 213,500,000
Corporate bonds    
Schedule of Investments [Line Items]    
Amortized Cost 97,600,000 64,700,000
Fair Value 99,063,000 65,312,000
Collateralized loan obligations    
Schedule of Investments [Line Items]    
Amortized Cost 1,081,583,000 366,165,000
Fair Value 1,051,264,000 370,985,000
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost 98,850,000 29,112,000
Fair Value 99,962,000 29,161,000
Private asset-backed investments    
Schedule of Investments [Line Items]    
Amortized Cost 289,022,000 209,600,000
Fair Value 300,947,000 208,357,000
Investments in joint ventures    
Schedule of Investments [Line Items]    
Amortized Cost 391,000,000  
Fair Value 391,000,000  
Preferred equity    
Schedule of Investments [Line Items]    
Amortized Cost 302,430,000 107,984,000
Fair Value 317,476,000 122,570,000
Other equity    
Schedule of Investments [Line Items]    
Amortized Cost 522,977,000 239,826,000
Fair Value 590,618,000 $ 250,457,000
Subordinated Certificates Of ADLP    
Schedule of Investments [Line Items]    
Amortized Cost 391,000,000  
Fair Value $ 391,000,000  
Amortized Cost 13  
Fair Value 13