v3.25.4
Cover - shares
 6 Months Ended
Dec. 31, 2025
Feb. 11, 2026
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2025  
Document Transition Report false  
Entity 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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Central Index Key 0001521945  
Current Fiscal Year End Date --06-30  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Class A    
Entity Common Stock, Shares Outstanding   9,201,669
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