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Earnings per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings per Share | 9. Earnings per Share The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net earnings attributable to controlling interests |  | $ | 818.8 |  |  | $ | 668.8 |  |  | $ | 633.5 |
Weighted average number of common shares outstanding |  |  | 191.0 |  |  |  | 186.0 |  |  |  | 182.7 |
Dilutive effect of stock options using the treasury stock method |  |  | 4.0 |  |  |  | 4.1 |  |  |  | 3.5 |
Weighted average number of common and common equivalent shares outstanding |  |  | 195.0 |  |  |  | 190.1 |  |  |  | 186.2 |
Basic net earnings per share |  | $ | 4.29 |  |  | $ | 3.60 |  |  | $ | 3.47 |
Diluted net earnings per share |  | $ | 4.20 |  |  | $ | 3.52 |  |  | $ | 3.40 |
There were no anti-dilutive stock-based awards outstanding at December 31, 2020 that were excluded in the computation of the dilutive effect of stock-based awards for the year then ended. Anti-dilutive stock-based awards of 1.0 million and 1.0 million shares were outstanding at December 31, 2019 and 2018, respectively, but were excluded in the computation of the dilutive effect of stock‑based awards for the year 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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