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Earnings Per Share | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share ("EPS") There are no adjustments required to be made to net income for purposes of computing basic and diluted EPS. The average number of common shares outstanding is reconciled to those used in the basic and diluted EPS computations as follows:
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(Millions of shares) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Basic |  | 338.0 |  |  | 337.4 |  |  | 337.7 |  |  | 337.2 |
Dilutive effect of stock options and restricted share unit awards |  | 0.9 |  |  | 0.9 |  |  | 1.0 |  |  | 1.1 |
Diluted |  | 338.9 |  |  | 338.3 |  |  | 338.7 |  |  | 338.3 |
The impact of options outstanding that were not included in the computation of diluted EPS because their exercise price was greater than the average market price of the common shares was insignificant. The number of common shares outstanding as of June 30, 2023 and 2022 was 338.2 million and 337.6 million, respectively.

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