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Earnings Per Share (Notes) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
| Years ended December 31,
| 2014 |  | 2013 |  | 2012
Net income available to IPG common stockholders - basic | $ | 477.1 |  |  | $ | 259.2 |  |  | $ | 435.1 |
Adjustments: Effect of dilutive securities |  |  |  |  |
Interest on 4.25% Notes 1 | 0.0 |  |  | 0.0 |  |  | 0.3 |
Interest on 4.75% Notes 1 | 0.0 |  |  | 0.8 |  |  | 4.1 |
Dividends on preferred stock | 0.0 |  |  | 0.0 |  |  | 11.6 |
Net income available to IPG common stockholders - diluted | $ | 477.1 |  |  | $ | 260.0 |  |  | $ | 451.1 |
Weighted-average number of common shares outstanding - basic | 419.2 |  |  | 421.1 |  |  | 432.5 |
Add: Effect of dilutive securities |  |  |  |  |
Restricted stock, stock options and other equity awards | 6.2 |  |  | 5.2 |  |  | 7.2 |
4.25% Notes 1 | 0.0 |  |  | 0.0 |  |  | 7.9 |
4.75% Notes 1 | 0.0 |  |  | 3.3 |  |  | 16.9 |
Preferred stock outstanding 2 | 0.0 |  |  | 0.0 |  |  | 16.9 |
Weighted-average number of common shares outstanding - diluted | 425.4 |  |  | 429.6 |  |  | 481.4 |
Earnings per share available to IPG common stockholders - basic | $ | 1.14 |  |  | $ | 0.62 |  |  | $ | 1.01 |
Earnings per share available to IPG common stockholders - diluted | $ | 1.12 |  |  | $ | 0.61 |  |  | $ | 0.94 |
1 | We retired all of our outstanding 4.75% Notes and 4.25% Convertible Senior Notes due 2023 in March 2013 and March 2012, respectively. See Note 2 for further information. For purposes of calculating diluted earnings per share for 2013 and 2012, the potentially dilutive shares are pro-rated based on the period they were outstanding.
2 | We converted all of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock (the "Series B Preferred Stock") into common stock in October 2013. For purposes of calculating diluted earnings per share for 2013, the potentially dilutive shares would have been pro-rated based on the period they were outstanding but were antidilutive.
The following table presents the potential shares excluded from the diluted earnings per share calculation because the effect of including these potential shares would be antidilutive.
| Years ended December 31,
| 2014 |  | 2013 |  | 2012
Preferred Stock Outstanding 1 | 0.0 |  |  | 13.7 |  | 0.0 |
Securities excluded from the diluted earnings per share calculation because the exercise price was greater than the average market price: |  |  |  |  |
Stock options 2 | 0.0 |  |  | 0.1 |  |  | 6.6 |
1 | We converted all of our Series B Preferred Stock into common stock in October 2013. For purposes of calculating diluted earnings per share for 2013, the potentially dilutive shares would have been pro-rated based on the period they were outstanding but were antidilutive.
2 | These options were outstanding at the end of the respective periods. In any period in which the exercise price is less than the average market price, these options have the potential to be dilutive, and application of the treasury stock method would reduce this amount.

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