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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
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) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Basic |  | 352.7 |  |  | 359.2 |  |  | 354.4 |  |  | 360.0 |
Dilutive effect of stock options and restricted share unit awards |  | 2.1 |  |  | 2.3 |  |  | 2.3 |  |  | 2.4 |
Diluted |  | 354.8 |  |  | 361.5 |  |  | 356.7 |  |  | 362.4 |

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