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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Calculation for Basic and Diluted Earnings per Share | The calculation for basic and diluted EPS is as follows:
(in millions, except per share data) | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Amount attributable to S&P Global Inc. common shareholders: |  |  |  |  |
Net income | $ | 1,496 |  |  | $ | 2,106 |  |  | $ | 1,156 |
Basic weighted-average number of common shares outstanding | 256.3 |  |  | 262.8 |  |  | 271.6 |
Effect of stock options and other dilutive securities | 2.6 |  |  | 2.4 |  |  | 3.0 |
Diluted weighted-average number of common shares outstanding | 258.9 |  |  | 265.2 |  |  | 274.6 |
Earnings per share attributable to S&P Global Inc. common shareholders: |  |  |  |  |
Net income: |  |  |  |  |
Basic | $ | 5.84 |  |  | $ | 8.02 |  |  | $ | 4.26 |
Diluted | $ | 5.78 |  |  | $ | 7.94 |  |  | $ | 4.21 |

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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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