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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
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) |  | 2018 |  | 2017
Basic |  | 350.4 |  |  | 356.0 |
Dilutive effect of stock options and restricted share unit awards |  | 2.2 |  |  | 2.6 |
Diluted |  | 352.6 |  |  | 358.6 |

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