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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Basis of Presentation and Significant Accounting Policies |
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):
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net income (loss) attributable to World Fuel | $ | (170.2 | ) |  | $ | 126.5 |  |  | $ | 174.5 |
Denominator: |  |  |  |  |
Weighted average common shares for basic earnings per common share | 68.1 |  |  | 69.3 |  |  | 70.2 |
Effect of dilutive securities | — |  |  | 0.5 |  |  | 0.5 |
Weighted average common shares for diluted earnings per common share | 68.1 |  |  | 69.8 |  |  | 70.7 |
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 | 1.4 |  |  | 1.3 |  |  | 1.0 |
Basic earnings (loss) per common share | $ | (2.50 | ) |  | $ | 1.82 |  |  | $ | 2.49 |
Diluted earnings (loss) per common share | $ | (2.50 | ) |  | $ | 1.81 |  |  | $ | 2.47 |

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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://www.xbrl.org/2003/role/presentationRef -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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