v3.25.2
Cover - USD ($)
 12 Months Ended
Jun. 30, 2025
Aug. 26, 2025
Dec. 31, 2024
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2025    
Current Fiscal Year End Date --06-30    
Document Transition Report false    
Securities Act File Number 814-00908    
Entity Registrant Name Prospect Floating Rate and Alternative Income Fund, Inc.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 45-2460782    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Documents Incorporated by Reference
Portions of the Registrant’s definitive Proxy Statement relating to its 2025 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, are incorporated by reference in Part III of this Annual Report on Form 10-K to the extent described herein.
    
Entity Central Index Key 0001521945    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Public Float     $ 0
Common Class A      
Entity Common Stock, Shares Outstanding   8,983,852  
Common Class I      
Entity Common Stock, Shares Outstanding   2,237  
Common Class S      
Entity Common Stock, Shares Outstanding   0  
Common Class D      
Entity Common Stock, Shares Outstanding   0