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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 15, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol TSLX    
Entity Registrant Name Sixth Street Specialty Lending, Inc.    
Entity Central Index Key 0001508655    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Document Annual Report true    
Document Transition Report false    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity File Number 001-36364    
Entity Tax Identification Number 27-3380000    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 2100 McKinney Avenue    
Entity Address, Address Line Two Suite 1500    
Entity Address, City or Town Dallas    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75201    
City Area Code 469    
Local Phone Number 621-3001    
Entity Public Float     $ 1,574,522,738
Entity Common Stock, Shares Outstanding   87,829,499  
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NYSE    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s proxy statement for the 2024 annual meeting of stockholders are incorporated by reference in Part III.

Auditor Firm Id:185 Auditor Name: KPMG LLP Auditor Location: New York, New York

    
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location New York, New York