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Earnings Per Share | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Earnings Per Share | EARNINGS PER SHARE The following table provides a reconciliation of the data used in the calculation of basic and diluted common shares outstanding for the three years ended December 31, 2014, 2013 and 2012.
| 2014 |  |  | 2013 |  |  | 2012 |
Weighted average common shares outstanding | 91.5 |  |  | 90.9 |  |  | 92.7 |
Add: Weighted average restricted stock awards outstanding(a) | — |  |  | 0.1 |  |  | 0.3 |
Basic weighted average common shares outstanding | 91.5 |  |  | 91.0 |  |  | 93.0 |
Add: Dilutive impact of stock options and restricted stock units | 1.3 |  |  | 1.3 |  |  | 1.1 |
Diluted weighted average common shares outstanding | 92.8 |  |  | 92.3 |  |  | 94.1 |
(a) | Restricted stock awards containing rights to non-forfeitable dividends which participate in undistributed earnings with common shareholders are considered participating securities for purposes of computing earnings per share.
The following table provides the number of shares underlying stock options excluded from the computation of diluted earnings per share for the three years ended December 31, 2014, 2013 and 2012 because they were anti-dilutive.
| 2014 |  |  | 2013 |  |  | 2012 |
Anti-dilutive stock options | 0.2 |  |  | 0.2 |  |  | 2.0 |
Average exercise price | $ | 43.51 |  |  | $ | 26.83 |  |  | $ | 21.47 |
Year(s) of expiration | 2024 |  |  | 2023 |  |  | 2014-2022 |
In addition, 0.1 of outstanding employee ROIC awards were excluded from the computation of diluted earnings per share for the year ended December 31, 2014, as the performance period related to ROIC awards has not been achieved.

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