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Earnings per Share
 12 Months Ended
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.