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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Average Common Shares Outstanding Basic and Diluted | 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 |  |  |  |  |

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