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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 19, 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 001-09533    
Entity Registrant Name WORLD FUEL SERVICES CORPORATION    
Entity Incorporation, State or Country Code FL    
Entity Address, Address Line One 9800 N.W. 41st Street,    
Entity Address, City or Town Miami,    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33178    
Entity Tax Identification Number 59-2459427    
City Area Code 305    
Local Phone Number 428-8000    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol INT    
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    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,600,695,540
Entity Common Stock, Shares Outstanding   63,124,580  
Entity Central Index Key 0000789460    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY