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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
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) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Basic |  | 340.9 |  |  | 344.2 |  |  | 341.1 |  |  | 344.3 |
Dilutive effect of stock options and restricted share unit awards |  | 1.0 |  |  | 1.8 |  |  | 1.2 |  |  | 1.7 |
Diluted |  | 341.9 |  |  | 346.0 |  |  | 342.3 |  |  | 346.0 |

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