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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 09, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-34452    
Entity Registrant Name Apollo Commercial Real Estate Finance, Inc.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 27-0467113    
Entity Address, Address Line One 9 West 57th Street    
Entity Address, Address Line Two 43rd Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10019    
City Area Code 212    
Local Phone Number 515–3200    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol ARI    
Security Exchange Name NYSE    
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    
Small Business Entity false    
Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,376,568,797
Entity Common Stock, Shares Outstanding   139,848,875  
Documents Incorporated by Reference Portions of the registrant’s proxy statement for the 2021 annual meeting of stockholders are incorporated by reference into Part III of this annual report on Form 10-K.    
Amendment flag false    
Document fiscal year focus 2020    
Document fiscal period focus FY    
Entity central index key 0001467760