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Earnings Per Share | 3 Months Ended
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Mar. 31, 2021
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 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 March 31 |  |
(Millions of shares) |  | 2021 |  | 2020 |  |  |  |
Basic |  | 338.2 |  |  | 341.4 |  |  |  |  |
Dilutive effect of stock options and restricted share unit awards |  | 1.2 |  |  | 2.7 |  |  |  |  |
Diluted |  | 339.4 |  |  | 344.1 |  |  |  |  |
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 March 31, 2021 and 2020 was 337.6 million and 340.8 million, respectively.

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