v3.26.1
Debt - Schedule of Outstanding Debt Obligations (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Jun. 27, 2025
Jun. 12, 2025
Oct. 21, 2024
Jan. 09, 2024
Apr. 27, 2022
Debt Instrument [Line Items]              
Aggregate Principal Committed $ 4,045,000,000 $ 4,145,000,000          
Outstanding Principal 2,334,615,000 2,836,315,000          
Unused Portion 1,710,385,000 1,308,685,000          
Amount Available 780,712,000 954,997,000          
Unamortized Debt Issuance Costs (28,583,000) (32,959,000)          
Net Carrying Value 2,306,032,000 2,803,356,000          
Line of credit              
Debt Instrument [Line Items]              
Unamortized Debt Issuance Costs (28,583,000) (32,959,000)          
Line of credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Aggregate Principal Committed         $ 1,050,000,000.00    
Unamortized Debt Issuance Costs (6,734,000) (7,735,000)          
Line of credit | SPV Asset Facility I              
Debt Instrument [Line Items]              
Aggregate Principal Committed 750,000,000 750,000,000         $ 750,000,000.0
Outstanding Principal 429,000,000 497,000,000          
Unused Portion 321,000,000 253,000,000          
Amount Available 62,874,000 66,742,000          
Unamortized Debt Issuance Costs (4,797,000) (5,626,000)          
Net Carrying Value 424,203,000 491,374,000          
Line of credit | SPV Asset Facility II              
Debt Instrument [Line Items]              
Aggregate Principal Committed 500,000,000 500,000,000          
Outstanding Principal 225,250,000 320,250,000          
Unused Portion 274,750,000 179,750,000          
Amount Available 33,650,000 78,842,000          
Unamortized Debt Issuance Costs (3,124,000) (3,589,000)          
Net Carrying Value 222,126,000 316,661,000          
Line of credit | SPV Asset Facility III              
Debt Instrument [Line Items]              
Aggregate Principal Committed 550,000,000 550,000,000       $ 550,000,000.0  
Outstanding Principal 350,000,000 550,000,000          
Unused Portion 200,000,000 0          
Amount Available 30,610,000 0          
Unamortized Debt Issuance Costs (6,605,000) (6,929,000)          
Net Carrying Value 343,395,000 543,071,000          
Line of credit | SPV Asset Facility IV              
Debt Instrument [Line Items]              
Aggregate Principal Committed 750,000,000 750,000,000   $ 750,000,000.0      
Outstanding Principal 441,500,000 629,500,000          
Unused Portion 308,500,000 120,500,000          
Amount Available 128,150,000 53,978,000          
Unamortized Debt Issuance Costs (4,655,000) (5,840,000)          
Net Carrying Value 436,845,000 623,660,000          
Line of credit | Athena CLO III              
Debt Instrument [Line Items]              
Aggregate Principal Committed 270,000,000 270,000,000          
Outstanding Principal 270,000,000 270,000,000          
Unused Portion 0 0          
Amount Available 0 0          
Unamortized Debt Issuance Costs (2,052,000) (2,188,000)          
Net Carrying Value 267,948,000 267,812,000          
Line of credit | Series 2023B-A Notes              
Debt Instrument [Line Items]              
Aggregate Principal Committed 100,000,000 100,000,000          
Outstanding Principal 100,000,000 100,000,000          
Unused Portion 0 0          
Amount Available 0 0          
Unamortized Debt Issuance Costs (462,000) (552,000)          
Net Carrying Value 99,538,000 99,448,000          
Line of credit | Series 2023B-B Notes              
Debt Instrument [Line Items]              
Aggregate Principal Committed 75,000,000 75,000,000          
Outstanding Principal 75,000,000 75,000,000          
Unused Portion 0 0          
Amount Available 0 0          
Unamortized Debt Issuance Costs (154,000) (293,000)          
Net Carrying Value 74,846,000 74,707,000          
Line of credit | Series 2023A Notes              
Debt Instrument [Line Items]              
Aggregate Principal Committed   100,000,000          
Outstanding Principal   100,000,000          
Unused Portion   0          
Amount Available   0          
Unamortized Debt Issuance Costs 0 (207,000)          
Net Carrying Value   99,793,000          
Line of credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Aggregate Principal Committed 944,200,000 1,090,000,000.00          
Line of credit | Revolving Credit Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Aggregate Principal Committed 1,050,000,000 1,050,000,000 $ 925,000,000.0   $ 875,000,000.0    
Outstanding Principal 443,865,000 294,565,000          
Unused Portion 606,135,000 755,435,000          
Amount Available 525,428,000 755,435,000          
Unamortized Debt Issuance Costs (6,734,000) (7,735,000)          
Net Carrying Value $ 437,131,000 $ 286,830,000