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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
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 September 30 |  | Nine Months Ended September 30
(Millions of shares) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Basic |  | 343.8 |  |  | 347.2 |  |  | 344.1 |  |  | 348.8 |
Dilutive effect of stock options and restricted share unit awards |  | 2.1 |  |  | 1.6 |  |  | 1.9 |  |  | 1.6 |
Diluted |  | 345.9 |  |  | 348.8 |  |  | 346.0 |  |  | 350.4 |

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