XML 21 R14.htm IDEA: XBRL DOCUMENT v3.24.2.u1
N-2 - $ / shares
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Cover [Abstract]        
Entity Central Index Key 0001655050      
Amendment Flag false      
Securities Act File Number 814-01175      
Document Type 10-Q      
Entity Registrant Name BAIN CAPITAL SPECIALTY FINANCE, INC.      
Entity Address, Address Line One 200 Clarendon Street      
Entity Address, Address Line Two 37th Floor      
Entity Address, City or Town Boston      
Entity Address, State or Province MA      
Entity Address, Postal Zip Code 02116      
City Area Code 617      
Local Phone Number 516‑2000      
Entity Emerging Growth Company false      
General Description of Registrant [Abstract]        
Risk Factors [Table Text Block]

In addition to the other information set forth in this report, you should carefully consider the factors described below and discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, which could materially affect our business, financial condition and/or operating results. The risks described in our Annual Report on Form 10-K are not the only risks we face. Additional risks and uncertainties are not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

      
Share Price $ 16.31   $ 13.51  
NAV Per Share $ 17.7 $ 17.6 $ 17.44 $ 17.29