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Earnings per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings per Share | 8. Earnings Per Share The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data):
| Three-month period ended |  |  | Nine-month period ended |
| September 30, |  |  | September 30, |
| 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net earnings attributable to controlling interests | $ | 176.6 |  |  | $ | 126.1 |  |  | $ | 676.6 |  |  | $ | 570.3 |
Weighted average number of common shares outstanding |  | 191.9 |  |  |  | 186.3 |  |  |  | 190.4 |  |  |  | 185.5 |
Dilutive effect of stock options using the treasury stock method |  | 4.4 |  |  |  | 4.4 |  |  |  | 4.1 |  |  |  | 4.1 |
Weighted average number of common and common equivalent shares outstanding |  | 196.3 |  |  |  | 190.7 |  |  |  | 194.5 |  |  |  | 189.6 |
Basic net earnings per share | $ | 0.92 |  |  | $ | 0.68 |  |  | $ | 3.55 |  |  | $ | 3.07 |
Diluted net earnings per share | $ | 0.90 |  |  | $ | 0.66 |  |  | $ | 3.48 |  |  | $ | 3.01 |
There were no anti-dilutive stock-based awards outstanding at September 30, 2020 and 2019 that were excluded in the computation of the dilutive effect of stock-based awards for the three-months ended. Anti-dilutive stock-based awards of 1.0 million and 0.9 million shares were outstanding at September 30, 2020 and 2019, respectively, but were excluded in the computation of the dilutive effect of stock-based awards for the nine‑month periods then ended. These stock-based awards were excluded from the computation because the exercise prices on these stock-based awards were greater than the average market price of our common shares during the respective period, and therefore, would be anti-dilutive to earnings per share under the treasury stock method.

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