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Earnings per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares | A reconciliation of basic weighted-average shares outstanding to diluted weighted-average shares outstanding is as follows:
| Three Months Ended March 31,
(in millions) | 2018 |  | 2017
Basic weighted-average shares outstanding | 152.2 |  |  | 159.4 |
Effect of dilutive securities(1) | 2.6 |  |  | 3.4 |
Diluted weighted-average shares outstanding(2) | 154.8 |  |  | 162.8 |
(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 both the three months ended March 31, 2018 and 2017 as their inclusion would have had an anti-dilutive effect.

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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