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Basis of Presentation, New Accounting Standards and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [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):
| 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |
Net income (loss) attributable to World Fuel | $ | 178.9 |  |  | $ | 127.7 |  |  | $ | (170.2 | )
Denominator: |  |  |  |  |
Weighted average common shares for basic earnings per common share | 66.1 |  |  | 67.4 |  |  | 68.1 |
Effect of dilutive securities | 0.4 |  |  | 0.3 |  |  | — |
Weighted average common shares for diluted earnings per common share | 66.5 |  |  | 67.7 |  |  | 68.1 |
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 |  |  | 1.2 |  |  | 1.4 |
Basic earnings (loss) per common share | $ | 2.71 |  |  | $ | 1.89 |  |  | $ | (2.50 | )
Diluted earnings (loss) per common share | $ | 2.69 |  |  | $ | 1.89 |  |  | $ | (2.50 | )

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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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