v3.25.2
Cover
Jul. 21, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 21, 2025
Entity File Number 814-00841
Entity Registrant Name FS Specialty Lending Fund
Entity Central Index Key 0001501729
Entity Tax Identification Number 27-6822130
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 201 Rouse Boulevard
Entity Address, City or Town Philadelphia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19112
City Area Code 215
Local Phone Number 495-1150
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false