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Earnings Per Share (Notes) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Net income available to IPG common stockholders | $ | 351.1 |  |  | $ | 656.0 |  |  | $ | 618.9 |
Weighted-average number of common shares outstanding - basic | 389.4 |  |  | 386.1 |  |  | 383.3 |
Dilutive effect of stock options and restricted shares | 3.8 |  |  | 5.1 |  |  | 5.7 |
Weighted-average number of common shares outstanding - diluted | 393.2 |  |  | 391.2 |  |  | 389.0 |
Earnings per share available to IPG common stockholders: |  |  |  |  |
Basic | $ | 0.90 |  |  | $ | 1.70 |  |  | $ | 1.61 |
Diluted | $ | 0.89 |  |  | $ | 1.68 |  |  | $ | 1.59 |

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