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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income available to IPG common stockholders | $ | 161.0 |  |  | $ | 169.7 |  |  | $ | 292.7 |  |  | $ | 302.1 |
Weighted-average number of common shares outstanding - basic | 382.6 |  |  | 389.5 |  |  | 383.2 |  |  | 391.2 |
Dilutive effect of stock options and restricted shares | 5.8 |  |  | 7.7 |  |  | 5.2 |  |  | 7.4 |
Weighted-average number of common shares outstanding - diluted | 388.4 |  |  | 397.2 |  |  | 388.4 |  |  | 398.6 |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.42 |  |  | $ | 0.44 |  |  | $ | 0.76 |  |  | $ | 0.77 |
Diluted | $ | 0.41 |  |  | $ | 0.43 |  |  | $ | 0.75 |  |  | $ | 0.76 |

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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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