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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2011
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.
| Three months ended September 30, |  | Nine months ended September 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Net income available to IPG common stockholders - basic | $ | 208.1 |  |  | $ | 42.4 |  |  | $ | 261.7 |  |  | $ | 76.2 |
Adjustments: Effect of dilutive securities |  |  |  |  |  |  |
Interest on 4.25% Notes | 0.4 |  |  | 0.3 |  |  | 1.0 |  |  | 1.0 |
Interest on 4.75% Notes | 1.0 |  |  | 1.0 |  |  | 3.1 |  |  | 0.0 |
Preferred stock dividends | 2.9 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |
Benefit from preferred stock repurchased 1 | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | (21.7 | )
Net income available to IPG common stockholders - diluted | $ | 212.4 |  |  | $ | 43.7 |  |  | $ | 265.8 |  |  | $ | 55.5 |
Weighted-average number of common shares outstanding - basic | 464.7 |  |  | 474.7 |  |  | 471.3 |  |  | 473.0 |
Add: Effect of dilutive securities |  |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 7.6 |  |  | 10.6 |  |  | 7.7 |  |  | 9.3 |
4.25% Notes | 32.5 |  |  | 32.2 |  |  | 32.5 |  |  | 32.2 |
4.75% Notes | 16.3 |  |  | 16.1 |  |  | 16.3 |  |  | 0.0 |
Preferred stock outstanding | 16.5 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |
Preferred stock repurchased | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 11.9 |
Weighted-average number of common shares outstanding - diluted | 537.6 |  |  | 533.6 |  |  | 527.8 |  |  | 526.4 |
Earnings per share available to IPG common stockholders - basic | $ | 0.45 |  |  | $ | 0.09 |  |  | $ | 0.56 |  |  | $ | 0.16 |
Earnings per share available to IPG common stockholders - diluted | $ | 0.40 |  |  | $ | 0.08 |  |  | $ | 0.50 |  |  | $ | 0.11 |
1 | For the nine months ended September 30, 2010, the benefit from the preferred stock repurchased is excluded from net income available to IPG common stockholders for purposes of calculating diluted earnings per share since the associated common shares, if converted, were dilutive. In addition, the benefit is also net of $4.0 of preferred dividends that were declared during the first quarter of 2010 and associated with the preferred stock repurchased.
Potential Shares Excluded from Diluted Earnings Per Share Calculation | 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.
| Three months ended September 30, |  | Nine months ended September 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
4.75% Notes | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 16.1 |
Preferred stock outstanding | 0.0 |  |  | 16.2 |  |  | 16.5 |  |  | 16.2 |
Total | 0.0 |  |  | 16.2 |  |  | 16.5 |  |  | 32.3 |
Securities excluded from the diluted earnings per share calculation because the exercise price was greater than the average market price: |  |  |  |  |  |  |
Stock options 1 | 12.6 |  |  | 16.6 |  |  | 9.1 |  |  | 19.5 |
1 | 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 Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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. + Details
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