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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Net income available to IPG common stockholders | $ | 128.6 |  |  | $ | 74.9 |  |  | $ | 290.9 |  |  | $ | 194.3 |
Weighted-average number of common shares outstanding - basic | 397.7 |  |  | 407.6 |  |  | 399.5 |  |  | 409.7 |
Add: Effect of dilutive securities |  |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 10.2 |  |  | 7.9 |  |  | 9.3 |  |  | 7.3 |
Weighted-average number of common shares outstanding - diluted | 407.9 |  |  | 415.5 |  |  | 408.8 |  |  | 417.0 |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.32 |  |  | $ | 0.18 |  |  | $ | 0.73 |  |  | $ | 0.47 |
Diluted | $ | 0.32 |  |  | $ | 0.18 |  |  | $ | 0.71 |  |  | $ | 0.47 |

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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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