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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net income attributable to World Fuel $ 37.2 $ 31.2  
Diluted earnings per common share (in dollars per share) $ 0.55 $ 0.46  
Discrete tax benefit $ 2.8    
Operating income 70.4 $ 57.2  
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right of use assets     $ 167.3
Lease liabilities     $ 173.6
Recognized from prior period      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating income 3.4    
Operating income, after tax 2.3    
Excluding errors      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net income attributable to World Fuel $ 31.7    
Diluted earnings per common share (in dollars per share) $ 0.47    
Discrete tax benefit $ 3.2