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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 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:
(Millions of shares) |  | 2021 |  | 2020 |  | 2019
Basic |  | 337.3 |  |  | 340.7 |  |  | 343.6 |
Dilutive effect of stock options and restricted share unit awards |  | 1.5 |  |  | 1.8 |  |  | 2.0 |
Diluted |  | 338.8 |  |  | 342.5 |  |  | 345.6 |

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