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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 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:
|  | Year Ended December 31,
(in millions) |  | 2018 |  | 2017 |  | 2016
Basic weighted-average shares outstanding |  | 150.9 |  |  | 155.4 |  |  | 163.6 |
Effect of dilutive securities (1) |  | 2.7 |  |  | 2.8 |  |  | 2.4 |
Diluted weighted-average shares outstanding (2) |  | 153.6 |  |  | 158.2 |  |  | 166.0 |
(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 the years ended December 31, 2018, 2017 and 2016, respectively, 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://fasb.org/us-gaap/role/ref/legacyRef -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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