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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2022
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 June 30 |  | Six Months Ended June 30
(Millions of shares) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Basic |  | 337.4 |  |  | 337.3 |  |  | 337.2 |  |  | 337.8 |
Dilutive effect of stock options and restricted share unit awards |  | 0.9 |  |  | 1.0 |  |  | 1.1 |  |  | 1.0 |
Diluted |  | 338.3 |  |  | 338.3 |  |  | 338.3 |  |  | 338.8 |

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