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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, 2015
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,
| 2015 |  | 2014 |  | 2013
Net income available to IPG common stockholders - basic | $ | 454.6 |  |  | $ | 477.1 |  |  | $ | 259.2 |
Adjustments: Effect of dilutive securities |  |  |  |  |
Interest on 4.75% Notes 1 | 0.0 |  |  | 0.0 |  |  | 0.8 |
Net income available to IPG common stockholders - diluted | $ | 454.6 |  |  | $ | 477.1 |  |  | $ | 260.0 |
Weighted-average number of common shares outstanding - basic | 408.1 |  |  | 419.2 |  |  | 421.1 |
Add: Effect of dilutive securities |  |  |  |  |
Restricted stock, stock options and other equity awards | 7.6 |  |  | 6.2 |  |  | 5.2 |
4.75% Notes 1 | 0.0 |  |  | 0.0 |  |  | 3.3 |
Weighted-average number of common shares outstanding - diluted | 415.7 |  |  | 425.4 |  |  | 429.6 |
Earnings per share available to IPG common stockholders - basic | $ | 1.11 |  |  | $ | 1.14 |  |  | $ | 0.62 |
Earnings per share available to IPG common stockholders - diluted | $ | 1.09 |  |  | $ | 1.12 |  |  | $ | 0.61 |
1 | We retired all of our outstanding 4.75% Convertible Senior Notes due 2023 (the "4.75% Notes") in March 2013. For purposes of calculating diluted earnings per share for 2013, the potentially dilutive shares are pro-rated based on the period in which they were outstanding.

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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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