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Earnings Per Share | 12 Months Ended
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Dec. 31, 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:
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Basic weighted-average shares outstanding |  | 138.5 |  |  | 142.6 |  |  | 145.1 |
Effect of dilutive securities (1) |  | 2.0 |  |  | 2.2 |  |  | 2.7 |
Diluted weighted-average shares outstanding (2) |  | 140.5 |  |  | 144.8 |  |  | 147.8 |
(1) The dilutive effect of outstanding stock options, restricted stock units, performance share units and Coworker Stock Purchase Plan (“CSPP”) 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 the years ended December 31, 2021, 2020 and 2019, respectively, as their inclusion would have had an anti-dilutive effect.

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