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Earnings per Share | 9 Months Ended
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Sep. 30, 2019
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 September 30, |  | Nine Months Ended September 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Basic weighted-average shares outstanding | 144.5 |  |  | 150.9 |  |  | 145.7 |  |  | 151.6 |
Effect of dilutive securities(1) | 2.7 |  |  | 2.8 |  |  | 2.5 |  |  | 2.5 |
Diluted weighted-average shares outstanding(2) | 147.2 |  |  | 153.7 |  |  | 148.2 |  |  | 154.1 |
(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 0.1 million potential common shares excluded from diluted weighted-average shares outstanding for both the three and nine months ended September 30, 2019 and 2018 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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