v3.26.1
Financial Highlights and Senior Securities - Senior Securities (Details)
$ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2026
AUD ($)
Mar. 31, 2026
EUR (€)
Mar. 31, 2026
GBP (£)
Mar. 26, 2026
USD ($)
Dec. 31, 2025
AUD ($)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
GBP (£)
Oct. 22, 2025
USD ($)
Aug. 12, 2025
USD ($)
Mar. 05, 2025
USD ($)
May 23, 2024
USD ($)
Oct. 05, 2023
USD ($)
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding                 $ 748,300,000       $ 849,100,000 $ 1,250,000,000 $ 1,254,075,000 $ 526,000,000 $ 429,100,000
Net asset value per share (in dollars per share) | $ / shares $ 1,000                                
HLEND A Funding Facility | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 723,382,000 $ 758,407,000 $ 683,184,000 $ 615,838,000 $ 453,663,000 $ 94,413 € 83,500 £ 0   $ 94,413 € 75,500 £ 0          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6 $ 2,473.7                        
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
HLEND B Funding Facility | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 900,773,000 $ 833,783,000 $ 955,572,000 $ 513,747,000 $ 482,084,000 $ 25,519 € 125,352 £ 90,347   $ 25,519 € 125,352 £ 90,347          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6 $ 2,473.7                        
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
HLEND C Funding Facility | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 510,000,000 $ 510,000,000 $ 487,500,000 $ 487,500,000                          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
HLEND D Funding Facility | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 575,428,000 $ 757,110,000 $ 830,343,000 $ 195,000,000   $ 0 € 167,513 £ 0   $ 0 € 167,513 £ 0          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
HLEND E Funding Facility | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 903,100,000 $ 906,290,000 $ 642,800,000     $ 0 € 167,836 £ 0   $ 0 € 167,836 £ 0          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2                            
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00%     0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
Revolving Credit Facility | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 592,290,000 $ 1,742,106,000 $ 1,186,264,000 $ 1,025,294,000 $ 704,819,000 $ 34,910 € 360,592 £ 114,392   $ 43,310 € 374,495 £ 225,692          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6 $ 2,473.7                        
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
November 2025 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 0 $ 0 $ 170,000,000 $ 170,000,000 $ 170,000,000                        
Asset coverage per unit $ 0 $ 0 $ 2,163.2 $ 2,231.6 $ 2,473.7                        
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
November 2027 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 155,000,000 $ 155,000,000 $ 155,000,000 $ 155,000,000 $ 155,000,000                        
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6 $ 2,473.7                        
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
March 2026 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 0 $ 0 $ 276,000,000 $ 276,000,000                          
Asset coverage per unit $ 0 $ 0 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
March 2028 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 124,000,000 $ 124,000,000 $ 124,000,000 $ 124,000,000                          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
September 2027 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 75,000,000 $ 75,000,000 $ 75,000,000 $ 75,000,000                          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
September 2028 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 250,000,000 $ 250,000,000 $ 250,000,000 $ 250,000,000                          
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
January 2029 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 550,000,000 $ 550,000,000 $ 550,000,000                            
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2                            
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00%     0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
September 2029 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 400,000,000 $ 400,000,000 $ 400,000,000                            
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2                            
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00%     0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
January 2028 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 750,000,000 $ 750,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
April 2032 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 500,000,000 $ 500,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
June 2027 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 400,000,000 $ 400,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
June 2030 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 500,000,000 $ 500,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
September 2028-1 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 600,000,000 $ 600,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
November 2030 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 500,000,000 $ 500,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
April 2029 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 350,000,000                                
Asset coverage per unit $ 1,960.5                                
Involuntary liquidating preference per unit (as percent) 0.00%         0.00% 0.00% 0.00%                  
April 2031 Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 400,000,000                                
Asset coverage per unit $ 1,960.5                                
Involuntary liquidating preference per unit (as percent) 0.00%         0.00% 0.00% 0.00%                  
2023 CLO Secured Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 0 $ 0 $ 323,000,000 $ 323,000,000                          
Asset coverage per unit $ 0 $ 0 $ 2,163.2 $ 2,231.6                          
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
2023 CLO Refinancing Secured Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 578,000,000 $ 578,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
2024 CLO Secured Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 400,000,000 $ 400,000,000 $ 400,000,000                            
Asset coverage per unit $ 1,960.5 $ 1,957.4 $ 2,163.2                            
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00%     0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
2025 CLO Secured Debt | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 850,000,000 $ 850,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
2025-4 CLO Secured Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 850,000,000 $ 850,000,000                              
Asset coverage per unit $ 1,960.5 $ 1,957.4                              
Involuntary liquidating preference per unit (as percent) 0.00% 0.00%       0.00% 0.00% 0.00%   0.00% 0.00% 0.00%          
2026 CLO Secured Notes | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 510,000,000                                
Asset coverage per unit $ 1,960.5                                
Involuntary liquidating preference per unit (as percent) 0.00%         0.00% 0.00% 0.00%                  
Short-Term Borrowings | Line of credit                                  
Investment Company, Financial Highlights [Line Items]                                  
Principal Outstanding $ 0 $ 0 $ 0 $ 0 $ 379,081,000                        
Asset coverage per unit $ 0 $ 0 $ 0 $ 0 $ 2,473.7                        
Involuntary liquidating preference per unit (as percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00%