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Summary Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of unaudited quarterly result |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 8,872.0 | $ 8,543.0 | $ 8,086.2 | $ 8,194.3 | $ 7,792.1 | $ 7,399.8 | $ 6,633.0 | $ 5,190.8 | $ 33,695.5 | $ 27,015.8 | $ 30,381.4
Gross profit | 229.9 | 239.9 | 231.0 | 231.4 | 222.3 | 236.7 | 218.5 | 221.5 | 932.2 | 899.0 | 861.0
Net income (loss) including noncontrolling interest | (193.7) | (37.9) | 30.3 | 31.1 | 2.1 | 43.0 | 29.8 | 51.6 | (170.3) | 126.4 | 170.5
Net income (loss) attributable to World Fuel | $ (193.1) | $ (38.5) | $ 30.0 | $ 31.3 | $ 2.2 | $ 42.7 | $ 30.0 | $ 51.8 | $ (170.2) | $ 126.5 | $ 174.5
Basic earnings per common share (in dollars per share) | $ (2.86) | $ (0.57) | $ 0.44 | $ 0.46 | $ 0.03 | $ 0.62 | $ 0.43 | $ 0.74 | $ (2.50) | $ 1.82 | $ 2.49
Diluted earnings per common share (in dollars per share) | $ (2.86) | $ (0.57) | $ 0.44 | $ 0.45 | $ 0.03 | $ 0.61 | $ 0.43 | $ 0.74 | $ (2.50) | $ 1.81 | $ 2.47
Effective income tax rate reconciliation, valuation allowance on U.S. deferred tax assets |  | $ 76.9 |  |  |  |  |  |  |  |  |
Goodwill and other impairments | $ 91.9 |  |  |  |  |  |  |  | $ 91.9 | $ 0.0 | $ 0.0
Cumulative loss period |  | 3 years |  |  |  |  |  |  |  |  |
Restructuring charges | $ 59.6 |  |  |  |  |  |  |  | 59.6 | $ 0.0 | $ 0.0
Transition tax toll charge on historic accumulated foreign earnings |  |  |  |  |  |  |  |  | $ 143.7 |  |

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