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Earnings Per Share (Notes) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Loss Per Share The following sets forth basic and diluted loss per common share available to IPG common stockholders.
| Three months ended March 31,
| 2019 |  | 2018
Net loss available to IPG common stockholders | $ | (8.0 | ) |  | $ | (14.1 | )
Weighted-average number of common shares outstanding - basic | 384.5 |  |  | 383.4 |
Dilutive effect of stock options and restricted shares | N/A |  |  | N/A |
Weighted-average number of common shares outstanding - diluted | 384.5 |  |  | 383.4 |
Loss per share available to IPG common stockholders: |  |  |
Basic | $ | (0.02 | ) |  | $ | (0.04 | )
Diluted | $ | (0.02 | ) |  | $ | (0.04 | )
Shares outstanding and loss per share are equal on a basic and diluted basis for the three months ended March 31, 2019 and 2018 because our potentially dilutive securities are antidilutive as a result of the net loss available to IPG common stockholders. Potential shares of restricted stock and stock options totaling 4.4 and 5.2 were excluded from the diluted loss per share calculation for the three months ended March 31, 2019 and 2018, respectively.

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