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Earnings Per Share (Notes) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings (Loss) Per Share The following sets forth basic and diluted earnings (loss) per common share available to IPG common stockholders.
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Net income (loss) available to IPG common stockholders | $ | 263.3 |  |  | $ | (45.6) |  |  | $ | 355.0 |  |  | $ | (40.9) |
Weighted-average number of common shares outstanding - basic | 393.3 |  |  | 389.4 |  |  | 392.4 |  | 388.5
Dilutive effect of stock options and restricted shares | 5.7 |  |  | N/A |  | 5.2 |  |  | N/A
Weighted-average number of common shares outstanding - diluted | 399.0 |  |  | 389.4 |  |  | 397.6 |  | 388.5
Earnings (loss) per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.67 |  |  | $ | (0.12) |  |  | $ | 0.90 |  |  | $ | (0.11) |
Diluted | $ | 0.66 |  |  | $ | (0.12) |  |  | $ | 0.89 |  |  | $ | (0.11) |
Weighted-average number of common shares outstanding and loss per share available to IPG common stockholders were equal on a basic and diluted basis for the three and six months ended June 30, 2020, respectively, because our potentially dilutive securities are anti-dilutive as a result of the net loss available to IPG common stockholders. The potential dilutive effect of stock options and restricted shares on basic weighted-average number of common shares outstanding totaling 2.9 and 3.3 were excluded from the diluted loss per share calculation for the three and six months ended June 30, 2020, respectively.

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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=124432515&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=124432515&loc=d3e3630-109257 + Details
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