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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2016
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Net income available to IPG common stockholders | $ | 128.6 |  |  | $ | 74.9 |  |  | $ | 290.9 |  |  | $ | 194.3 |
Weighted-average number of common shares outstanding - basic | 397.7 |  |  | 407.6 |  |  | 399.5 |  |  | 409.7 |
Add: Effect of dilutive securities |  |  |  |  |  |  |
Restricted stock, stock options and other equity awards | 10.2 |  |  | 7.9 |  |  | 9.3 |  |  | 7.3 |
Weighted-average number of common shares outstanding - diluted | 407.9 |  |  | 415.5 |  |  | 408.8 |  |  | 417.0 |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.32 |  |  | $ | 0.18 |  |  | $ | 0.73 |  |  | $ | 0.47 |
Diluted | $ | 0.32 |  |  | $ | 0.18 |  |  | $ | 0.71 |  |  | $ | 0.47 |
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 1.6 shares in the effect of dilutive securities for the three and nine months ended September 30, 2016.

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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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