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Earnings Per Share | 9 Months Ended
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Sep. 30, 2021
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Basic weighted-average shares outstanding | 137.3 |  | 142.7 |  | 139.5 |  | 142.6 |
Effect of dilutive securities(1) | 2.1 |  | 2.1 |  | 1.9 |  | 2.1 |
Diluted weighted-average shares outstanding(2) | 139.4 |  | 144.8 |  | 141.4 |  | 144.7 |
(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 nine months ended September 30, 2021 and 2020 as their inclusion would have had an anti-dilutive effect.

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