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Earnings per Common Share (Tables) | 9 Months Ended
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Sep. 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 Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |
Net income attributable to World Fuel |  | $ | 38.2 |  |  | $ | (38.5 | ) |  | $ | 98.1 |  |  | $ | 22.8 |
Denominator: |  |  |  |  |  |  |  |
Weighted average common shares for basic earnings per common share |  | 67.5 |  |  | 67.9 |  |  | 67.5 |  |  | 68.3 |
Effect of dilutive securities |  | 0.2 |  |  | 0.3 |  |  | 0.3 |  |  | 0.3 |
Weighted average common shares for diluted earnings per common share |  | 67.7 |  |  | 68.2 |  |  | 67.8 |  |  | 68.6 |
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 |  | 1.0 |  |  | 1.6 |  |  | 1.3 |  |  | 1.4 |
Basic earnings per common share |  | $ | 0.57 |  |  | $ | (0.57 | ) |  | $ | 1.45 |  |  | $ | 0.33 |
Diluted earnings per common share |  | $ | 0.56 |  |  | $ | (0.57 | ) |  | $ | 1.45 |  |  | $ | 0.33 |

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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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