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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2012
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.
| Three months ended September 30, |  | Nine months ended September 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
Net income available to IPG common stockholders - basic | $ | 68.7 |  |  | $ | 208.1 |  |  | $ | 121.8 |  |  | $ | 261.7 |
Adjustments: Effect of dilutive securities |  |  |  |  |  |  |
Interest on 4.25% Notes 1 | 0.0 |  |  | 0.4 |  |  | 0.3 |  |  | 1.0 |
Interest on 4.75% Notes | 1.0 |  |  | 1.0 |  |  | 3.1 |  |  | 3.1 |
Preferred stock dividends | 0.0 |  |  | 2.9 |  |  | 0.0 |  |  | 0.0 |
Net income available to IPG common stockholders - diluted | $ | 69.7 |  |  | $ | 212.4 |  |  | $ | 125.2 |  |  | $ | 265.8 |
Weighted-average number of common shares outstanding - basic | 431.3 |  |  | 464.7 |  |  | 435.5 |  |  | 471.3 |
Add: Effect of dilutive securities |  |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 8.1 |  |  | 7.6 |  |  | 7.1 |  |  | 7.7 |
4.25% Notes 1 | 0.0 |  |  | 32.5 |  |  | 10.4 |  |  | 32.5 |
4.75% Notes | 16.7 |  |  | 16.3 |  |  | 16.7 |  |  | 16.3 |
Preferred stock outstanding | 0.0 |  |  | 16.5 |  |  | 0.0 |  |  | 0.0 |
Weighted-average number of common shares outstanding - diluted | 456.1 |  |  | 537.6 |  |  | 469.7 |  |  | 527.8 |
Earnings per share available to IPG common stockholders - basic | $ | 0.16 |  |  | $ | 0.45 |  |  | $ | 0.28 |  |  | $ | 0.56 |
Earnings per share available to IPG common stockholders - diluted | $ | 0.15 |  |  | $ | 0.40 |  |  | $ | 0.27 |  |  | $ | 0.50 |
1 | We retired all of our outstanding 4.25% Notes in March 2012. For purposes of calculating diluted earnings per share for the first nine months of 2012, the potentially dilutive shares are pro-rated based on the period they were outstanding.
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,
| 2012 |  | 2011 |  | 2012 |  | 2011
Preferred stock outstanding | 16.9 |  |  | 0.0 |  |  | 16.9 |  |  | 16.5 |
Securities excluded from the diluted earnings per share calculation because the exercise price was greater than the average market price: |  |  |  |  |  |  |
Stock options 1 | 7.1 |  |  | 12.6 |  |  | 7.1 |  |  | 9.1 |
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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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