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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings Per Share 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,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net income available to IPG common stockholders | $ | 146.2 |  |  | $ | 128.6 |  |  | $ | 262.4 |  |  | $ | 290.9 |
Weighted-average number of common shares outstanding - basic | 389.5 |  |  | 397.7 |  |  | 391.2 |  |  | 399.5 |
Dilutive effect of stock options and restricted shares | 7.7 |  |  | 10.2 |  |  | 7.4 |  |  | 9.3 |
Weighted-average number of common shares outstanding - diluted | 397.2 |  |  | 407.9 |  |  | 398.6 |  |  | 408.8 |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.38 |  |  | $ | 0.32 |  |  | $ | 0.67 |  |  | $ | 0.73 |
Diluted | $ | 0.37 |  |  | $ | 0.32 |  |  | $ | 0.66 |  |  | $ | 0.71 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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