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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Feb. 23, 2023
USD ($)
May 06, 2022
$ / shares
shares
Feb. 25, 2022
USD ($)
Dec. 23, 2020
USD ($)
$ / shares
shares
Aug. 02, 2018
USD ($)
$ / shares
shares
Apr. 03, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2023
USD ($)
company
investment
$ / shares
shares
Dec. 31, 2022
USD ($)
investment
company
$ / shares
shares
Schedule of Equity Method Investments [Line Items]                  
Repayments received/sales of portfolio investments             $ 981,200,000    
Payment for purchases of shares in repurchase plan               $ 14,772,000 $ 32,105,000
Share repurchase program, term 12 months                
Fair value               $ 2,488,715,000 [1] $ 2,448,935,000
Number of portfolio companies | company               4 7
Investment Denominated In Canadian Dollars                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               2 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 1
Investment Denominated In Swedish Krone                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               2 1
Investment Denominated In Euros                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               67 58
Investment Denominated In British Pounds Sterling                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               28 28
Senior debt and 1st lien notes                  
Schedule of Equity Method Investments [Line Items]                  
Fair value               $ 1,670,300,000 $ 1,696,192,000
Senior debt and 1st lien notes | Market Approach | Yield Analysis                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               6  
Fair value               $ 20,000,000  
Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Discount Rate | Discounted Cash Flow Analysis                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               1  
Fair value               $ 9,900,000  
Structured Products                  
Schedule of Equity Method Investments [Line Items]                  
Fair value               $ 93,038,000 73,550,000
Structured Products | Market Approach | Expected Recovery                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               1  
Fair value               $ 0  
Structured Products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Discounted Cash Flow Analysis                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               1  
Fair value               $ 3,300,000  
Equity shares                  
Schedule of Equity Method Investments [Line Items]                  
Fair value               $ 374,704,000 $ 284,570,000
Equity shares | Market Approach | Yield Analysis                  
Schedule of Equity Method Investments [Line Items]                  
Number of investments | investment               1  
Fair value               $ 5,300,000  
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               6.30% 5.90%
MVC                  
Schedule of Equity Method Investments [Line Items]                  
Common stock aggregate amount       $ 15,000,000          
Common stock market price percent of NAV, threshold       90.00%          
Shares of common stock repurchased (in shares) | shares   207,677   207,677          
Shares of common stock repurchased, average price (in dollars per share) | $ / shares   $ 10.14   $ 10.14          
Sierra Merger                  
Schedule of Equity Method Investments [Line Items]                  
Common stock aggregate amount     $ 30,000,000            
Common stock market price percent of NAV, threshold     90.00%            
Shares of common stock repurchased (in shares) | shares               1,849,096 3,179,168
Shares of common stock repurchased, average price (in dollars per share) | $ / shares               $ 7.99 $ 9.44
Payment for purchases of shares in repurchase plan                 $ 30,000,000
Number of portfolio companies | company               1 4
MVC Acquisition                  
Schedule of Equity Method Investments [Line Items]                  
Number of portfolio companies | company               1 2
Barings LLC                  
Schedule of Equity Method Investments [Line Items]                  
Number of portfolio companies | company               2 1
Common Stock                  
Schedule of Equity Method Investments [Line Items]                  
Common stock aggregate amount $ 30,000,000   $ 30,000,000 $ 15,000,000          
Common stock market price percent of NAV, threshold     90.00% 90.00%          
Shares of common stock repurchased (in shares) | shares               1,849,096 3,386,845
Payment for purchases of shares in repurchase plan               $ 2,000 $ 3,000
Common Stock | Sierra Merger                  
Schedule of Equity Method Investments [Line Items]                  
Payment for purchases of shares in repurchase plan                 $ 30,000,000
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      
[1] Fair value as a percentage of net assets.