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Earnings Per Share (Notes) | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings Per Share The following sets forth basic and diluted earnings (loss) per common share available to IPG common stockholders.
| Three months ended March 31,
| 2016 |  | 2015
Net income (loss) available to IPG common stockholders | $ | 5.4 |  |  | $ | (1.8 | )
Weighted-average number of common shares outstanding - basic | 400.6 |  |  | 411.1 |
Add: Effect of dilutive securities |  |  |
Restricted stock, stock options and other equity awards | 8.7 |  |  | N/A |
Weighted-average number of common shares outstanding - diluted | 409.3 |  |  | 411.1 |
Earnings (loss) per share available to IPG common stockholders: |  |  |
Basic | $ | 0.01 |  |  | $ | 0.00 |
Diluted | $ | 0.01 |  |  | $ | 0.00 |
As part of the adoption of Financial Accounting Standards Board (the “FASB”) Accounting Standards Update 2016-09, our excess tax benefit is no longer included in our calculation of diluted shares under the treasury stock method, resulting in an increase of 1.4 shares in the effect of dilutive securities for the three months ended March 31, 2016. Shares outstanding and loss per share are equal on a basic and diluted basis for the three months ended March 31, 2015 because our potentially dilutive securities are antidilutive as a result of the net loss available to IPG common stockholders. Potential shares of restricted stock, stock options and other equity awards totaling 6.3 were excluded from the diluted loss per share calculation for the three months ended March 31, 2015, because the effect of including these potential shares would be antidilutive.

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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 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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