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Summary Quarterly Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of unaudited quarterly result                      
Revenue $ 9,988.6 $ 10,429.5 $ 10,150.8 $ 9,181.3 $ 8,872.0 $ 8,543.0 $ 8,086.2 $ 8,194.3 $ 39,750.3 $ 33,695.5 $ 27,015.8
Gross profit 262.2 266.7 246.2 243.4 229.9 239.9 231.0 231.4 1,018.5 932.2 899.0
Net income (loss) including noncontrolling interest 29.8 38.7 29.2 31.3 (193.7) (37.9) 30.3 31.1 129.0 (170.3) 126.4
Net income (loss) attributable to World Fuel $ 29.6 $ 38.2 $ 28.7 $ 31.2 $ (193.1) $ (38.5) $ 30.0 $ 31.3 $ 127.7 $ (170.2) $ 126.5
Basic earnings per common share (in dollars per share) $ 0.44 $ 0.57 $ 0.42 $ 0.46 $ (2.86) $ (0.57) $ 0.44 $ 0.46 $ 1.89 $ (2.50) $ 1.82
Diluted earnings per common share (in dollars per share) $ 0.44 $ 0.56 $ 0.42 $ 0.46 $ (2.86) $ (0.57) $ 0.44 $ 0.45 $ 1.89 $ (2.50) $ 1.81
Effective income tax rate reconciliation, valuation allowance on U.S. deferred tax assets           $ 76.9          
Goodwill and other impairments         $ 91.9       $ 0.0 $ 91.9 $ 0.0
Cumulative loss period         3 years            
Restructuring charges $ 17.1       $ 59.6         59.6 $ 0.0
Transition tax toll charge on historic accumulated foreign earnings                   $ 143.7