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N-2 - $ / shares
Sep. 01, 2022
Jun. 30, 2022
Dec. 31, 2021
Cover [Abstract]      
Entity Central Index Key 0001287480    
Amendment Flag false    
Document Type N-CSRS    
Entity Registrant Name BLACKROCK FLOATING RATE INCOME TRUST    
General Description of Registrant [Abstract]      
Investment Objectives and Practices [Text Block]
BlackRock Floating Rate Income Trust’s (BGT) (the “Trust”)
primary investment objective is to provide a high level of current income. The Trust’s secondary investment objective is to seek the preservation of capital to the extent consistent with its primary objective of high current income. The Trust seeks to achieve its investment objectives by investing primarily, under normal conditions, at least 80% of its assets in floating and variable rate instruments of U.S. and
non-U.S.
issuers, including a substantial portion of its assets in global floating and variable rate securities including senior secured floating rate loans made to corporate and other business entities. Under normal market conditions, the Trust expects that the average effective duration of its portfolio will be no more than 1.5 years. The Trust may invest directly in such securities or synthetically through the use of derivatives. 		   
Share Price [Table Text Block]
Market Price and Net Asset Value Per Share Summary
 
    
06/30/22
     
12/31/21
     
Change
    
High
     
Low  
  
Closing Market Price
   $ 11.02      $ 13.99        (21.23 )%    $ 14.13      $ 10.80    
Net Asset Value
     12.10        13.44        (9.97 )      13.57        12.10    
    
Lowest Price or Bid   $ 10.8  
Highest Price or Bid   14.13  
Lowest Price or Bid, NAV   12.1  
Highest Price or Bid, NAV   13.57  
Latest Share Price   11.02 $ 13.99
Latest NAV   $ 12.1 $ 13.44
Capital Stock, Long-Term Debt, and Other Securities [Abstract]      
Outstanding Security, Held [Shares]   22,370,659