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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Common Share Available to IPG Common Stockholders | The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
| Years ended December 31,
| 2013 |  | 2012 |  | 2011
Net income available to IPG common stockholders - basic | $ | 259.2 |  |  | $ | 435.1 |  |  | $ | 520.7 |
Adjustments: Effect of dilutive securities |  |  |  |  |
Interest on 4.25% Notes 1 | 0.0 |  |  | 0.3 |  |  | 1.4 |
Interest on 4.75% Notes 1 | 0.8 |  |  | 4.1 |  |  | 4.1 |
Dividends on preferred stock | 0.0 |  |  | 11.6 |  |  | 11.6 |
Net income available to IPG common stockholders - diluted | $ | 260.0 |  |  | $ | 451.1 |  |  | $ | 537.8 |
Weighted-average number of common shares outstanding - basic | 421.1 |  |  | 432.5 |  |  | 465.5 |
Add: Effect of dilutive securities |  |  |  |  |
Restricted stock, stock options and other equity awards | 5.2 |  |  | 7.2 |  |  | 9.1 |
4.25% Notes 1 | 0.0 |  |  | 7.9 |  |  | 33.0 |
4.75% Notes 1 | 3.3 |  |  | 16.9 |  |  | 16.5 |
Preferred stock outstanding 2 | 0.0 |  |  | 16.9 |  |  | 16.5 |
Weighted-average number of common shares outstanding - diluted | 429.6 |  |  | 481.4 |  |  | 540.6 |
Earnings per share available to IPG common stockholders - basic | $ | 0.62 |  |  | $ | 1.01 |  |  | $ | 1.12 |
Earnings per share available to IPG common stockholders - diluted | $ | 0.61 |  |  | $ | 0.94 |  |  | $ | 0.99 |
1 | We retired all of our outstanding 4.75% Notes and 4.25% Notes 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 Series B Preferred Stock into common stock in October 2013. See Note 3 for further information. 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.
Potential Shares Excluded from Diluted Earnings Per Share Calculation | he 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,
| 2013 |  | 2012 |  | 2011
Preferred Stock Outstanding 1 | 13.7 |  |  | 0.0 |  | 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 | 0.1 |  |  | 6.6 |  |  | 8.9 |
1 | We converted all of our Series B Preferred Stock into common stock in October 2013. See Note 3 for further information. 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 are 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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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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