v3.26.1
Debt - Unsecured Notes (Details) - USD ($)
3 Months Ended
Nov. 15, 2025
Oct. 15, 2025
May 30, 2025
Apr. 28, 2025
Jan. 21, 2025
Apr. 04, 2024
Jun. 14, 2021
Dec. 17, 2020
Sep. 23, 2020
Mar. 31, 2026
Mar. 31, 2025
Jan. 23, 2026
Dec. 31, 2025
Sep. 27, 2023
Jun. 12, 2020
Debt Instrument [Line Items]                              
Borrowings on debt                   $ 1,600,001,000 $ 675,000,000        
Unsecured debt investments | Interest rate swaps                              
Debt Instrument [Line Items]                              
Notional amount                   1,750,000,000     $ 1,350,000,000    
Derivative fair value                   14,806,000     26,732,000    
June 2025 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed       $ 210,000,000.0                     $ 210,000,000
Company receives                             6.75%
Redemption price, percentage     100.00% 100.00%                      
Debt repurchased     $ 210,000,000.0                        
Interest rate, stated percentage                             6.75%
March 2028 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed                 $ 400,000,000            
Interest rate, stated percentage                 4.75%            
Borrowings on debt                 $ 250,000,000            
March 2028 Notes | Secured Debt                              
Debt Instrument [Line Items]                              
Debt instrument, repurchase amount $ 400,000,000 $ 400,000,000                          
Debt instrument, percentage of principal amount redeemed 100.00% 100.00%                          
June 2026 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed               $ 375,000,000   375,000,000     375,000,000    
Redemption price, percentage               100.00%              
Interest rate, stated percentage               3.75%              
January 2027 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed             $ 300,000,000     $ 300,000,000     300,000,000    
Redemption price, percentage             100.00%                
Interest rate, stated percentage             2.50%                
Interest rate swaps March 2028 Notes | Interest rate swaps                              
Debt Instrument [Line Items]                              
Company Pays                   1.767%          
Interest rate swaps March 2028 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed         $ 650,000,000.0         $ 650,000,000     $ 650,000,000    
Interest rate, stated percentage         6.10%                    
Debt periodic payment                   9,000,000.0 $ 6,000,000.0        
Interest rate swaps March 2028 Notes | Unsecured debt investments | Interest rate swaps                              
Debt Instrument [Line Items]                              
Company receives         6.10%               6.10% [1]    
Notional amount         $ 650,000,000.0               $ 650,000,000 [1]    
Company Pays [1]                         1.767%    
Derivative fair value                   $ 6,900,000     $ 12,113,000 [1]    
Interest rate swaps January 2031 Notes | Interest rate swaps                              
Debt Instrument [Line Items]                              
Company Pays                   2.495%          
Interest rate swaps January 2031 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed                   $ 400,000,000   $ 400,000,000.0      
Redemption price, percentage         100.00%                    
Interest rate, stated percentage                       6.125%      
Interest rate swaps January 2031 Notes | Unsecured debt investments | Interest rate swaps                              
Debt Instrument [Line Items]                              
Company receives                   6.13% [2]   6.125%      
Notional amount                   $ 400,000,000 [2]   $ 400,000,000.0      
Company Pays [2]                   2.50%          
Derivative fair value [2]                   $ (938,000)          
September 2028 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed                   75,000,000     75,000,000 $ 75,000,000.0  
Company receives                           8.50%  
Debt instrument, covenant, minimum asset coverage ratio                           1.50  
September 2028 Notes | Unsecured debt investments | Debt agreement event one                              
Debt Instrument [Line Items]                              
Debt instrument, fixed interest rate above stated rate                           1.00%  
September 2028 Notes | Unsecured debt investments | Debt agreement event two                              
Debt Instrument [Line Items]                              
Debt instrument, fixed interest rate above stated rate                           1.50%  
September 2028 Notes | Unsecured debt investments | Debt agreement event three                              
Debt Instrument [Line Items]                              
Debt instrument, fixed interest rate above stated rate                           2.00%  
Interest rate swaps April 2029 Notes | Unsecured debt investments                              
Debt Instrument [Line Items]                              
Aggregate principal committed           $ 700,000,000.0       $ 700,000,000     $ 700,000,000    
Redemption price, percentage           100.00%                  
Interest rate, stated percentage           6.75%                  
Interest rate swaps April 2029 Notes | Unsecured debt investments | Interest rate swaps                              
Debt Instrument [Line Items]                              
Company receives           6.75%       6.75% [3]     6.75% [4]    
Notional amount           $ 700,000,000.0       $ 700,000,000 [3]     $ 700,000,000 [4]    
Company Pays           2.565%       2.56% [3]     2.5645% [4]    
Derivative fair value                   $ 8,848,000 [3]     $ 14,619,000 [4]    
[1] The Company has an ISDA agreement with SMBC Capital Markets, Inc.
Forward Contracts as of December 31, 2025
Notional Amount to be PurchasedNotional Amount to be SoldCounterpartySettlement DateUnrealized Appreciation / (Depreciation)
Foreign currency forward contract$197,770 £147,230 Goldman Sachs Bank USA1/20/2026$(611)
Foreign currency forward contract$16,539 £12,500 SMBC Capital Markets, Inc.1/20/2026(304)
Foreign currency forward contract$6,296 5,301 SMBC Capital Markets, Inc.7/17/202615 
Foreign currency forward contract$334,694 282,462 Goldman Sachs Bank USA7/17/2026— 
Foreign currency forward contract$66,778 57,070 SMBC Capital Markets, Inc.7/17/2026(830)
Foreign currency forward contract$8,405 A$12,910 Goldman Sachs Bank USA1/20/2026(211)
Total$(1,941)
[2] The Company has an ISDA agreement with Regions Bank.
[3] The Company has an International Swaps and Derivatives Association (“ISDA”) agreement with Goldman Sachs Bank USA.
[4] The Company has an ISDA agreement with Goldman Sachs Bank USA.