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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Basic weighted-average shares outstanding | 139.8 |  | 142.4 |  | 140.6 |  | 142.5 |
Effect of dilutive securities(1) | 1.9 |  | 1.9 |  | 1.8 |  | 2.1 |
Diluted weighted-average shares outstanding(2) | 141.7 |  | 144.3 |  | 142.4 |  | 144.6 |
(1)The dilutive effect of outstanding stock options, restricted stock units, 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 six months ended June 30, 2021 and 2020 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=124432515&loc=d3e3550-109257 + Details
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