v3.26.1
Borrowings - Outstanding Debt Obligations (Details)
£ in Millions, $ in Millions, $ in Millions
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2026
EUR (€)
Jun. 30, 2026
GBP (£)
Jun. 30, 2026
AUD ($)
May 21, 2026
USD ($)
Mar. 03, 2026
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CAD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
AUD ($)
Oct. 14, 2025
USD ($)
Mar. 04, 2025
USD ($)
Dec. 16, 2024
USD ($)
Oct. 15, 2024
USD ($)
May 20, 2024
USD ($)
Sep. 30, 2021
USD ($)
Jul. 23, 2021
USD ($)
Apr. 27, 2021
USD ($)
Mar. 16, 2021
USD ($)
Dec. 01, 2020
USD ($)
Oct. 23, 2020
USD ($)
Debt Instrument [Line Items]                                              
Aggregate Principal Committed $ 10,411,130,000             $ 10,507,500,000                              
Outstanding Principal 7,613,729,000             8,100,621,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 7,536,067,000             8,080,129,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 51,435,000             39,900,000                              
Unused portion 2,797,401,000             2,406,879,000                              
Amount available 2,628,200,000             2,288,977,000                              
Jackson Hole Funding Facility | Line of Credit | Revolving Credit Facility                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 0             500,000,000   € 0                          
Outstanding Principal 0             22,374,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 0             22,374,000                              
Unused portion 0             477,626,000                              
Amount available 0             477,626,000                              
Breckenridge Funding Facility | Line of Credit | Revolving Credit Facility                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 1,175,000,000             1,175,000,000                              
Outstanding Principal 280,850,000             652,550,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 280,850,000             652,550,000                              
Unused portion 894,150,000             522,450,000                              
Amount available 885,921,000             418,348,000                              
Big Sky Funding Facility | Line of Credit | Revolving Credit Facility                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 800,000,000             650,000,000                              
Outstanding Principal 357,400,000             585,900,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 357,400,000             585,900,000                              
Unused portion 442,600,000             64,100,000                              
Amount available 324,447,000             64,100,000                              
BXSL 2025-1 Facility | Line of Credit | Revolving Credit Facility                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 400,000,000             400,000,000                              
Outstanding Principal 40,700,000             34,800,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 40,700,000             34,800,000                              
Unused portion 359,300,000             365,200,000                              
Amount available 317,000,000             351,400,000                              
Revolving Credit Facility | Line of Credit | Revolving Credit Facility                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 2,428,630,000 $ 38.4 € 390,500,000 £ 293.5 $ 45.0     2,425,000,000 $ 30.7 € 417,200,000 £ 293.5 $ 1.0                      
Outstanding Principal 1,327,279,000             1,447,497,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 1,327,279,000             1,447,497,000                              
Unused portion 1,101,351,000             977,503,000                              
Amount available 1,100,832,000             977,503,000                              
3.625% Notes Due 2026 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed               800,000,000                           $ 300,000,000.0 $ 500,000,000.0
Outstanding Principal               800,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts)               799,936,000                              
Unamortized Debt Issuance Costs (including premiums and discounts)               64,000                              
2.750% Notes Due 2026 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 700,000,000             700,000,000                       $ 300,000,000.0 $ 400,000,000.0    
Outstanding Principal 700,000,000             700,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 699,626,000             698,746,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 374,000             1,254,000                              
2.125% Senior Notes Due 2027 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 650,000,000             650,000,000                     $ 650,000,000.0        
Outstanding Principal 650,000,000             650,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 648,275,000             646,911,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 1,725,000             3,089,000                              
2.850% Notes Due 2028 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 650,000,000             650,000,000                   $ 650,000,000.0          
Outstanding Principal 650,000,000             650,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 645,768,000             644,837,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 4,232,000             5,163,000                              
5.875% Notes Due 2027 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 400,000,000             400,000,000                 $ 400,000,000.0            
Outstanding Principal 400,000,000             400,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 398,994,000             403,760,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 2,796,000             3,803,000                              
5.350% Notes Due 2028 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 700,000,000             700,000,000             $ 300,000,000.0 $ 400,000,000.0              
Outstanding Principal 700,000,000             700,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 691,596,000             700,057,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 4,780,000             6,107,000                              
5.300% Notes Due 2030 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 500,000,000             500,000,000           $ 500,000,000.0                  
Outstanding Principal 500,000,000             500,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 488,558,000             497,626,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 8,470,000             9,520,000                              
5.125% Notes Due 2031 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 500,000,000             500,000,000         $ 500,000,000.0                    
Outstanding Principal 500,000,000             500,000,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 481,188,000             489,847,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) 7,787,000             8,688,000                              
5.250% Notes Due 2029 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 400,000,000           $ 400,000,000.0                                
Outstanding Principal 400,000,000                                            
Carrying Value (net of unamortized issuance costs, premiums and discounts) 385,913,000                                            
Unamortized Debt Issuance Costs (including premiums and discounts) 5,422,000                                            
5.900% Notes Due 2031 | Unsecured debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 650,000,000         $ 650,000,000.0                                  
Outstanding Principal 650,000,000                                            
Carrying Value (net of unamortized issuance costs, premiums and discounts) 634,531,000                                            
Unamortized Debt Issuance Costs (including premiums and discounts) 13,738,000                                            
2024-1 CLO Debt                                              
Debt Instrument [Line Items]                                              
Aggregate Principal Committed 457,500,000             457,500,000                              
Outstanding Principal 746,770,000                                            
Outstanding Principal 457,500,000             457,500,000                              
Carrying Value (net of unamortized issuance costs, premiums and discounts) 455,389,000             455,288,000                              
Unamortized Debt Issuance Costs (including premiums and discounts) $ 2,111,000             $ 2,212,000