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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2020
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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income available to IPG common stockholders | $ | 279.7 |  |  | $ | 165.6 |  |  | $ | 238.8 |  |  | $ | 327.1 |
Weighted-average number of common shares outstanding - basic | 389.6 |  |  | 386.7 |  |  | 388.9 |  | 385.8
Dilutive effect of stock options and restricted shares | 4.3 |  | 5.1 |  | 3.7 |  | 4.5
Weighted-average number of common shares outstanding - diluted | 393.9 |  |  | 391.8 |  |  | 392.6 |  | 390.3
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.72 |  |  | $ | 0.43 |  |  | $ | 0.61 |  |  | $ | 0.85 |
Diluted | $ | 0.71 |  |  | $ | 0.42 |  |  | $ | 0.61 |  |  | $ | 0.84 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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