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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Average Common Shares Outstanding Basic and Diluted | A reconciliation of the average number of common shares outstanding used in the basic and diluted EPS computations follows:
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
(Millions of shares) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Basic |  | 359.2 |  |  | 363.9 |  |  | 360.0 |  |  | 364.5 |
Dilutive effect of stock options and restricted share unit awards |  | 2.3 |  |  | 2.3 |  |  | 2.4 |  |  | 2.4 |
Diluted |  | 361.5 |  |  | 366.2 |  |  | 362.4 |  |  | 366.9 |

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