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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2015
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,
| 2015 |  | 2014 |  | 2015 |  | 2014
Net income available to IPG common stockholders - basic and diluted | $ | 74.9 |  |  | $ | 89.7 |  |  | $ | 194.3 |  |  | $ | 168.2 |
Weighted-average number of common shares outstanding - basic | 407.6 |  |  | 419.2 |  |  | 409.7 |  |  | 421.0 |
Add: Effect of dilutive securities |  |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 7.9 |  |  | 7.2 |  |  | 7.3 |  |  | 6.2 |
Weighted-average number of common shares outstanding - diluted | 415.5 |  |  | 426.4 |  |  | 417.0 |  |  | 427.2 |
Earnings per share available to IPG common stockholders - basic | $ | 0.18 |  |  | $ | 0.21 |  |  | $ | 0.47 |  |  | $ | 0.40 |
Earnings per share available to IPG common stockholders - diluted | $ | 0.18 |  |  | $ | 0.21 |  |  | $ | 0.47 |  |  | $ | 0.39 |

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