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Earnings Per Share | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share ("EPS") There are no adjustments required to be made to net income for purposes of computing EPS. 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 |
Options outstanding that were not included in the computation of diluted EPS because their exercise price was greater than the average market price of the common shares were insignificant. The number of common shares outstanding as of September 30, 2016 and 2015 was 358.4 million and 363.3 million, respectively.

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