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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 30, 2019
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-34766    
Entity Registrant Name ARMOUR RESIDENTIAL REIT, INC.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 26-1908763    
Entity Address, Address Line One 3001 Ocean Drive, Suite 201    
Entity Address, City or Town Vero Beach    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 32963    
City Area Code 772    
Local Phone Number 617-4340    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,088,759,660
Entity Common Stock, Shares Outstanding   58,877,848  
Documents Incorporated by Reference
Certain portions of the registrant’s definitive proxy statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 for its 2020 annual meeting of stockholders are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0001428205    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Series B Preferred Stock      
Entity Information [Line Items]      
Title of 12(b) Security Preferred Stock, 7.875% Series B Cumulative Redeemable    
Trading Symbol ARR-PRBCL    
Security Exchange Name NYSE    
Series C Preferred Stock      
Entity Information [Line Items]      
Title of 12(b) Security Preferred Stock, 7.00% Series C Cumulative Redeemable    
Trading Symbol ARR-PRC    
Security Exchange Name NYSE    
Common Stock      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol ARR    
Security Exchange Name NYSE