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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net income attributable to World Fuel $ 37.0   $ 28.7 $ 74.2 $ 59.9  
Diluted earnings per common share (in dollars per share) $ 0.55   $ 0.42 $ 1.10 $ 0.88  
Discrete tax benefit, prior year foreign tax return       $ (3.2)    
Income from operations $ 75.2   $ 61.1 145.6 $ 118.3  
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]            
Income from operations   $ 3.4        
Income from operations, net of tax   2.3        
Pro forma            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net income attributable to World Fuel       $ 68.8    
Diluted earnings per common share (in dollars per share)       $ 1.02    
Discrete tax benefit, prior year foreign tax return   $ 3.2