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Earnings per Share | 6 Months Ended
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Jun. 30, 2018
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:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Basic weighted-average shares outstanding | 151.6 |  |  | 156.0 |  |  | 151.9 |  |  | 157.7 |
Effect of dilutive securities(1) | 2.3 |  |  | 3.0 |  |  | 2.5 |  |  | 3.2 |
Diluted weighted-average shares outstanding(2) | 153.9 |  |  | 159.0 |  |  | 154.4 |  |  | 160.9 |
(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 fewer than 0.2 million potential common shares excluded from diluted weighted-average shares outstanding for both the three and six months ended June 30, 2018 and 2017 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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