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Earnings Per Share (Notes) | 3 Months Ended
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Mar. 31, 2024
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 March 31, |  |
| 2024 |  | 2023 |  |  |  |
Net income available to IPG common stockholders | $ | 110.4 |  |  | $ | 126.0 |  |  |  |  |
Weighted-average number of common shares outstanding - basic | 378.4 |  |  | 385.8 |  |  |  |  |
Dilutive effect of stock options and restricted shares | 2.2 |  |  | 1.6 |  |  |  |  |
Weighted-average number of common shares outstanding - diluted | 380.6 |  |  | 387.4 |  |  |  |  |
Earnings per share available to IPG common stockholders: |  |  |  |  |  |  |
Basic | $ | 0.29 |  |  | $ | 0.33 |  |  |  |  |
Diluted | $ | 0.29 |  |  | $ | 0.33 |  |  |  |  |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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