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Earnings Per Share Basic and Diluted Earnings Per Common Share Available to IPG Common Stockholders (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Common Share Available to IPG Common Stockholders | The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Net income available to IPG common stockholders | $ | 618.9 |  |  | $ | 554.4 |  |  | $ | 605.0 |
Weighted-average number of common shares outstanding - basic | 383.3 |  |  | 389.6 |  |  | 397.9 |
Dilutive effect of stock options and restricted shares | 5.7 |  |  | 7.7 |  |  | 10.1 |
Weighted-average number of common shares outstanding - diluted | 389.0 |  |  | 397.3 |  |  | 408.0 |
Earnings per share available to IPG common stockholders: |  |  |  |  |
Basic | $ | 1.61 |  |  | $ | 1.42 |  |  | $ | 1.52 |
Diluted | $ | 1.59 |  |  | $ | 1.40 |  |  | $ | 1.48 |

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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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