v3.25.2
Borrowings - Outstanding Debt Obligations (Details)
£ in Millions, $ in Millions, $ in Millions
Jun. 30, 2025
USD ($)
Jun. 30, 2025
EUR (€)
Jun. 30, 2025
CAD ($)
Jun. 30, 2025
GBP (£)
Jun. 30, 2025
AUD ($)
Mar. 04, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
GBP (£)
Dec. 31, 2024
AUD ($)
Dec. 16, 2024
USD ($)
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 $ 9,907,500,000           $ 9,307,500,000                          
Outstanding Principal 7,107,646,000           7,093,864,000                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 7,090,550,000           7,056,091,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 38,859,000           34,877,000                          
Unused portion 2,799,854,000           2,213,636,000                          
Amount available 2,704,165,000           2,191,402,000                          
Jackson Hole Funding Facility | Line of Credit | Revolving Credit Facility                                        
Debt Instrument [Line Items]                                        
Aggregate Principal Committed 500,000,000.0 € 0         500,000,000 € 0                        
Outstanding Principal 99,874,000           399,874,000                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 99,874,000           399,874,000                          
Unused portion 400,126,000           100,126,000                          
Amount available 400,126,000           100,126,000                          
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 595,850,000           649,350,000                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 595,850,000           649,350,000                          
Unused portion 579,150,000           525,650,000                          
Amount available 536,336,000           525,650,000                          
Big Sky Funding Facility | Line of Credit | Revolving Credit Facility                                        
Debt Instrument [Line Items]                                        
Aggregate Principal Committed 650,000,000           650,000,000                          
Outstanding Principal 343,150,000           400,000,000                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 343,150,000           400,000,000                          
Unused portion 306,850,000           250,000,000                          
Amount available 253,975,000           227,766,000                          
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 0           0                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 0           0                          
Unused portion 400,000,000           400,000,000                          
Amount available 400,000,000           400,000,000                          
Revolving Credit Facility | Line of Credit | Revolving Credit Facility                                        
Debt Instrument [Line Items]                                        
Aggregate Principal Committed 2,325,000,000 € 283,900,000 $ 30.7 £ 258.0 $ 1.0   2,225,000,000 € 277,700,000 $ 38.2 £ 266.3 $ 1.0                  
Outstanding Principal 1,211,272,000           1,287,140,000                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 1,211,272,000           1,287,140,000                          
Unused portion 1,113,728,000           937,860,000                          
Amount available 1,113,728,000           937,860,000                          
3.625% Notes Due 2026 | Unsecured debt                                        
Debt Instrument [Line Items]                                        
Aggregate Principal Committed 800,000,000           800,000,000                       $ 300,000,000.0 $ 500,000,000.0
Outstanding Principal 800,000,000           800,000,000                          
Carrying Value (net of unamortized issuance costs, premiums and discounts) 799,026,000           798,145,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 974,000           1,855,000                          
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) 697,857,000           696,980,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 2,143,000           3,020,000                          
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) 645,529,000           644,167,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 4,471,000           5,833,000                          
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) 643,889,000           642,963,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 6,111,000           7,037,000                          
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) 403,545,000           397,898,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 4,813,000           5,818,000                          
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) 698,176,000           684,491,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) 7,450,000           8,897,000                          
5.300% notes due 2030 | Unsecured debt                                        
Debt Instrument [Line Items]                                        
Aggregate Principal Committed 500,000,000         $ 500,000,000.0                            
Outstanding Principal 500,000,000                                      
Carrying Value (net of unamortized issuance costs, premiums and discounts) 497,197,000                                      
Unamortized Debt Issuance Costs (including premiums and discounts) 10,582,000                                      
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) 455,185,000           455,083,000                          
Unamortized Debt Issuance Costs (including premiums and discounts) $ 2,315,000           $ 2,417,000