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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | 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,
| 2014 |  | 2013 |  | 2014 |  | 2013
Net income available to IPG common stockholders - basic and diluted | $ | 89.7 |  |  | $ | 45.4 |  |  | $ | 168.2 |  |  | $ | 66.1 |
Weighted-average number of common shares outstanding - basic | 419.2 |  | 419.7 |  |  | 421.0 |  | 419.7 |
Add: Effect of dilutive securities |  |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 7.2 |  | 6.4 |  | 6.2 |  | 5.1
Weighted-average number of common shares outstanding - diluted | 426.4 |  | 426.1 |  |  | 427.2 |  | 424.8 |
Earnings per share available to IPG common stockholders - basic | $ | 0.21 |  |  | $ | 0.11 |  |  | $ | 0.40 |  |  | $ | 0.16 |
Earnings per share available to IPG common stockholders - diluted | $ | 0.21 |  |  | $ | 0.11 |  |  | $ | 0.39 |  |  | $ | 0.16 |
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,
| 2014 |  | 2013 |  | 2014 |  | 2013
4.75% Notes 1 | 0.0 |  | 0.0 |  | 0.0 |  | 4.4
Preferred stock 2 | 0.0 |  | 17.3 |  | 0.0 |  | 17.3
Total | 0.0 |  |  | 17.3 |  |  | 0.0 |  |  | 21.7 |
Securities excluded from the diluted earnings per share calculation because the exercise price was greater than the average market price: |  |  |  |  |  |  |
Stock options 3 | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.2 |
1 | We retired all of our outstanding 4.75% Convertible Senior Notes due 2023 (the "4.75% Notes") in March 2013. For purposes of calculating diluted earnings per share, the potentially dilutive shares are pro-rated based on the period they were outstanding but were antidilutive.
2 | We converted all of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock into common stock in October 2013.
3 | 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 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: 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 3: 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 4: 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=32703322&loc=d3e4984-109258 Reference 5: 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=26872669&loc=d3e20235-122688 + Details
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