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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Cover [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2021  
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   $ 1,973
Entity Common Stock, Shares Outstanding 63,443,635  
Entity Central Index Key 0000789460  
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY