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Earnings per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per common share | The following table sets forth the computation of basic and diluted earnings per common share for the periods presented (in millions, except per share amounts):
|  | For the Three Months Ended |  | For the Six Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |
Net income attributable to World Fuel |  | $ | 28.7 |  |  | $ | 30.0 |  |  | $ | 59.9 |  |  | $ | 61.4 |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares for basic earnings per common share |  | 67.7 |  |  | 68.4 |  |  | 67.6 |  |  | 68.5 |
Effect of dilutive securities |  | 0.3 |  |  | 0.3 |  |  | 0.4 |  |  | 0.4 |
Weighted average common shares for diluted earnings per common share |  | 68.0 |  |  | 68.7 |  |  | 67.9 |  |  | 68.9 |
Weighted average securities which are not included in the calculation of diluted earnings per common share because their impact is anti-dilutive or their performance conditions have not been met |  | 1.2 |  |  | 1.9 |  |  | 1.4 |  |  | 1.3 |
Basic earnings per common share |  | $ | 0.42 |  |  | $ | 0.44 |  |  | $ | 0.89 |  |  | $ | 0.90 |
Diluted earnings per common share |  | $ | 0.42 |  |  | $ | 0.44 |  |  | $ | 0.88 |  |  | $ | 0.89 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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