v3.26.3
Cover
Oct. 28, 2026
Oct. 28, 2025
Document Information [Line Items]    
Document Type N-2  
Document Registration Statement true  
Pre-Effective Amendment false  
Post-Effective Amendment true  
Post-Effective Amendment Number 6  
Dividend or Interest Reinvestment Plan Only false  
Delayed or Continuous Offering true  
Effective Upon Filing, 462(e) false  
Additional Securities Effective, 413(b) false  
Effective when Declared, Section 8(c) false  
Effective upon Filing, 486(b) true  
Effective on Set Date, 486(b) false  
Effective after 60 Days, 486(a) false  
Effective on Set Date, 486(a) false  
New Effective Date for Previous Filing   false
Additional Securities. 462(b) false  
No Substantive Changes, 462(c) false  
Exhibits Only, 462(d) false  
Approximate Date of Commencement of Proposed Sale to Public As soon as practicable after the effective date of this Registration Statement.  
Amendment Flag false  
Entity Information [Line Items]    
Entity Registrant Name Prospect Floating Rate and Alternative Income Fund, Inc.  
Entity Central Index Key 0001521945  
Securities Act File Number 333-274497  
Entity Well-known Seasoned Issuer No  
Entity Emerging Growth Company false  
Entity Inv Company Type N-2  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 10 East 40th Street  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10016  
Entity Phone Fax Numbers [Line Items]    
City Area Code 212  
Local Phone Number 448-0702  
Business Contact [Member]    
Entity Information [Line Items]    
Entity Registrant Name Prospect Floating Rate and Alternative Income Fund, Inc.  
Entity Contact Personnel [Line Items]    
Contact Personnel Name Kristin Van Dask  
Entity Address, Address Line One 10 East 40th Street  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10016