v3.25.4
N-2 - USD ($)
 6 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Cover [Abstract]            
Entity Central Index Key 0001521945          
Amendment Flag false          
Securities Act File Number 814-00908          
Document Type 10-Q          
Entity Registrant Name Prospect Floating Rate and Alternative Income Fund, Inc.          
Entity Address, Address Line One 10 East 40th Street          
Entity Address, Address Line Two 42nd Floor          
Entity Address, City or Town New York          
Entity Address, State or Province NY          
Entity Address, Postal Zip Code 10016          
City Area Code 212          
Local Phone Number 448-0702          
Entity Emerging Growth Company false          
Financial Highlights [Abstract]            
Senior Securities [Table Text Block]
Revolving Credit FacilityTotal Amount OutstandingAsset Coverage per Unit(1)Involuntary Liquidating Preference per Unit(2)Average Market Value per Unit(2)
December 31, 2025$37,040,732 $1,937 — — 
September 30, 2025$39,246,250 $1,949 — — 
June 30, 2025$45,500,000 $1,879 — — 
June 30, 2024$27,800,000 $2,125 — — 
June 30, 2023$8,600,000 $2,709 — — 
June 30, 2022$20,500,000 $1,815 — — 
(1) The asset coverage ratio is calculated as our consolidated total assets, less all liabilities and indebtedness not represented by senior securities, divided by secured senior securities representing indebtedness. This asset coverage ratio is multiplied by $1,000 to determine the Asset Coverage Per Unit.
          
OZK Credit Facility [Member]            
Financial Highlights [Abstract]            
Senior Securities Amount $ 37,040,732 $ 39,246,250 $ 45,500,000 $ 27,800,000 $ 8,600,000 $ 20,500,000
Senior Securities Coverage per Unit $ 1,937 $ 1,949 $ 1,879 $ 2,125 $ 2,709 $ 1,815