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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Feb. 25, 2022
USD ($)
Dec. 23, 2020
USD ($)
Sep. 11, 2018
USD ($)
$ / shares
shares
Sep. 06, 2018
Aug. 02, 2018
USD ($)
$ / shares
shares
Apr. 03, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2022
USD ($)
company
investment
$ / shares
shares
Dec. 31, 2021
USD ($)
investment
company
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Feb. 27, 2020
Sep. 24, 2018
shares
Aug. 07, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]                            
Repayments received/sales of portfolio investments             $ 981,200,000              
Loss on extinguishment of debt               $ 0 $ 0 $ 3,089,000        
Payment for purchases of shares in repurchase plan               $ 32,105,000   $ 7,131,000        
Percent of stock repurchased       8.70%                    
Common stock, shares issued (in shares) | shares               107,916,166 65,316,085          
Number of portfolio companies | company               7 2          
Investment Denominated In Canadian Dollars                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               2 1          
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 5          
Investment Denominated In New Zealand Dollars                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               2            
Investment Denominated In Norwegian Krone                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               1            
Investment Denominated In Swiss Francs                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               1            
Investment Denominated In Swedish Krone                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               1 1          
Investment Denominated In Euros                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               58 36          
Investment Denominated In British Pounds Sterling                            
Schedule of Equity Method Investments [Line Items]                            
Number of investments | investment               28 18          
Single Portfolio Company | Investment Owned, At Fair Value | Portfolio Company Investment Risk                            
Schedule of Equity Method Investments [Line Items]                            
Percent of Total Portfolio               5.90% 5.50%          
Barings BDC, Inc. | Barings LLC                            
Schedule of Equity Method Investments [Line Items]                            
Common stock, shares issued (in shares) | shares               13,639,681         5,084,302  
Ownership percentage by noncontrolling owners               12.60%            
Tender Offer                            
Schedule of Equity Method Investments [Line Items]                            
Common stock aggregate amount                           $ 50,000,000
Shares of common stock repurchased (in shares) | shares     4,901,961                      
Stock repurchased during period (in dollars per share) | $ / shares     $ 10.20                      
Payment for purchases of shares in repurchase plan     $ 50,000,000                      
2020 Share Repurchase Program                            
Schedule of Equity Method Investments [Line Items]                            
Shares of common stock repurchased (in shares) | shares                   989,050        
Shares of common stock repurchased, average price (in dollars per share) | $ / shares                   $ 7.21        
Maximum number of shares to be repurchased, percent                       5.00%    
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                  
SBA-Guaranteed Debentures                            
Schedule of Equity Method Investments [Line Items]                            
Loss on extinguishment of debt                     $ 3,500,000      
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                
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            
Shares of common stock repurchased, average price (in dollars per share) | $ / shares               $ 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               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            
Number of portfolio companies | company               4            
MVC Acquisition                            
Schedule of Equity Method Investments [Line Items]                            
Number of portfolio companies | company               2 2          
Barings LLC                            
Schedule of Equity Method Investments [Line Items]                            
Number of portfolio companies | company               1            
Common Stock                            
Schedule of Equity Method Investments [Line Items]                            
Common stock aggregate amount $ 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               3,386,845   989,050        
Payment for purchases of shares in repurchase plan               $ 3,000   $ 1,000