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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Feb. 22, 2024
USD ($)
Feb. 23, 2023
USD ($)
May 06, 2022
$ / shares
shares
Feb. 25, 2022
USD ($)
Dec. 23, 2020
USD ($)
Aug. 02, 2018
USD ($)
$ / shares
shares
Apr. 03, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2024
USD ($)
investment
segment
company
$ / shares
shares
Dec. 31, 2023
USD ($)
investment
company
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Schedule of Equity Method Investments [Line Items]                      
Repayments received/sales of portfolio investments/ Sales of short-term investments               $ 981,200,000 $ 641,752,000 $ 593,505,000 $ 1,041,370,000
Payment for purchases of shares in repurchase plan                 6,442,000 14,772,000 $ 32,105,000
Total investments at fair value                 $ 2,449,272,000 $ 2,488,715,000  
Number of portfolio companies | company                 8 4  
Number of paid-in-kind, partial non-accrual portfolio companies, originated by the company | investment                 1    
Number of operating segments | segment                 1    
Number of reportable segments | segment                 1    
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk                      
Schedule of Equity Method Investments [Line Items]                      
Percent of Total Portfolio                 6.20% 6.30%  
Sierra Merger                      
Schedule of Equity Method Investments [Line Items]                      
Number of portfolio companies | company                 2 1  
MVC Acquisition                      
Schedule of Equity Method Investments [Line Items]                      
Number of portfolio companies | company                 1 1  
Barings LLC                      
Schedule of Equity Method Investments [Line Items]                      
Number of portfolio companies | company                 5 2  
Equity shares                      
Schedule of Equity Method Investments [Line Items]                      
Total investments at fair value                 $ 409,129,000 $ 374,704,000  
Senior debt and 1st lien notes                      
Schedule of Equity Method Investments [Line Items]                      
Total investments at fair value                 1,686,411,000 1,670,300,000  
Subordinated debt and 2nd lien notes                      
Schedule of Equity Method Investments [Line Items]                      
Total investments at fair value                 165,455,000 238,215,000  
Structured Product                      
Schedule of Equity Method Investments [Line Items]                      
Total investments at fair value                 $ 79,548,000 $ 93,038,000  
Investment Denominated In Canadian Dollars                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 1 2  
Investment Denominated In Danish Kroner                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 1 1  
Investment Denominated In Australian Dollars                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 11 11  
Investment Denominated In New Zealand Dollars                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 2 2  
Investment Denominated In Norwegian Krone                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 1 1  
Investment Denominated In Swiss Francs                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 2 2  
Investment Denominated In Swedish Krone                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 2 2  
Investment Denominated In Euros                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 72 67  
Investment Denominated In British Pounds Sterling                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 27 28  
Yield Analysis | Equity shares | Market Approach                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 2 1  
Total investments at fair value                 $ 20,200,000 $ 5,300,000  
Yield Analysis | Equity shares | Expected Recovery                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 1    
Total investments at fair value                 $ 56,900    
Yield Analysis | Senior debt and 1st lien notes | Market Approach                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 7 6  
Total investments at fair value                 $ 31,500,000 $ 20,000,000  
Discounted Cash Flow Analysis | Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Discount Rate                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                   1  
Total investments at fair value                   $ 9,900,000  
Discounted Cash Flow Analysis | Structured Product | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                   1  
Total investments at fair value                   $ 3,300,000  
Expected Recovery | Equity shares | Market Approach                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                   1  
Total investments at fair value                   $ 0  
Expected Recovery | Subordinated debt and 2nd lien notes | Market Approach                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 1    
Total investments at fair value                 $ 3,800,000    
Market Approach | Senior debt and 1st lien notes | Yield Analysis                      
Schedule of Equity Method Investments [Line Items]                      
Number of investments | investment                 1    
Total investments at fair value                 $ 600,000    
December 23, 2020 Program                      
Schedule of Equity Method Investments [Line Items]                      
Common stock aggregate amount         $ 15,000,000            
Common stock market price percent of NAV, threshold         90.00%            
Share repurchase program, term         12 months            
Shares of common stock repurchased (in shares) | shares     207,677                
Shares of common stock repurchased, average price (in dollars per share) | $ / shares     $ 10.14                
February 25, 2022 Program                      
Schedule of Equity Method Investments [Line Items]                      
Common stock aggregate amount       $ 30,000,000              
Common stock market price percent of NAV, threshold       90.00%              
Share repurchase program, term       12 months              
Shares of common stock repurchased (in shares) | shares                     3,179,168
Shares of common stock repurchased, average price (in dollars per share) | $ / shares                     $ 9.44
Payment for purchases of shares in repurchase plan                     $ 30,000,000
February 23, 2023 Program                      
Schedule of Equity Method Investments [Line Items]                      
Common stock aggregate amount   $ 30,000,000                  
Share repurchase program, term   12 months                  
Shares of common stock repurchased (in shares) | shares                   1,894,096  
Shares of common stock repurchased, average price (in dollars per share) | $ / shares                   $ 7.99  
February 22, 2024 Program                      
Schedule of Equity Method Investments [Line Items]                      
Common stock aggregate amount $ 30,000,000                    
Share repurchase program, term 12 months                    
Shares of common stock repurchased (in shares) | shares                 658,132    
Shares of common stock repurchased, average price (in dollars per share) | $ / shares                 $ 9.79    
Private Placement                      
Schedule of Equity Method Investments [Line Items]                      
Number of shares issued in transaction (in shares) | shares           8,529,917          
Price per share (in dollars per share) | $ / shares           $ 11.723443          
Consideration received           $ 100,000,000          
Barings LLC | Payment To Shareholders | Affiliated Entity                      
Schedule of Equity Method Investments [Line Items]                      
Related party transaction amount (up to)             $ 85,000,000        
Barings LLC | Payment For Company Common Stock At Net Asset Value | Affiliated Entity                      
Schedule of Equity Method Investments [Line Items]                      
Related party transaction amount (up to)             100,000,000        
Barings LLC | Purchase Of Common Stock At Market Value | Affiliated Entity                      
Schedule of Equity Method Investments [Line Items]                      
Related party transaction amount (up to)             $ 50,000,000        
Period of commitment             2 years