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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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 June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income available to IPG common stockholders | $ | 145.8 |  |  | $ | 107.7 |  |  | $ | 131.7 |  |  | $ | 132.4 |
Weighted-average number of common shares outstanding - basic | 383.6 |  |  | 392.3 |  |  | 383.5 |  |  | 392.0 |
Dilutive effect of stock options and restricted shares | 5.9 |  |  | 8.0 |  |  | 5.4 |  |  | 7.6 |
Weighted-average number of common shares outstanding - diluted | 389.5 |  |  | 400.3 |  |  | 388.9 |  |  | 399.6 |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.38 |  |  | $ | 0.27 |  |  | $ | 0.34 |  |  | $ | 0.34 |
Diluted | $ | 0.37 |  |  | $ | 0.27 |  |  | $ | 0.34 |  |  | $ | 0.33 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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