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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The numerator for both basic and diluted earnings per share is Net income. The denominator for basic earnings per share is the weighted-average shares outstanding during the period. A reconciliation of basic weighted-average shares outstanding to diluted weighted-average shares outstanding is as follows:
|  | Years Ended December 31,
(in millions) |  | 2017 |  | 2016 |  | 2015
Basic weighted-average shares outstanding |  | 155.4 |  |  | 163.6 |  |  | 170.3 |
Effect of dilutive securities (1) |  | 2.8 |  |  | 2.4 |  |  | 1.5 |
Diluted weighted-average shares outstanding (2) |  | 158.2 |  |  | 166.0 |  |  | 171.8 |
(1) | The dilutive effect of outstanding stock options, restricted stock units, restricted stock, performance share units and Coworker Stock Purchase Plan units is reflected in the diluted weighted-average shares outstanding using the treasury stock method.
(2) | There were less than 1 million potential common shares excluded from diluted weighted-average shares outstanding for the years ended December 31, 2017, 2016 and 2015, respectively, as their inclusion would have had an anti-dilutive effect.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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