Earnings per Share

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019		2018
Net earnings attributable to controlling interests	$	334.1	$	273.7
Weighted average number of common shares outstanding		184.5		181.5
Dilutive effect of stock options using the treasury stock method		3.9		3.5
Weighted average number of common and common equivalent shares outstanding		188.4		185.0
Basic net earnings per share	$	1.81	$	1.51
Diluted net earnings per share	$	1.77	$	1.48

Anti-dilutive stock-based awards of 1.4 million and 0.2 million shares were outstanding at March 31, 2019 and 2018, respectively, but were excluded in the computation of the dilutive effect of stock-based awards for the three-month periods then ended. These stock-based awards were excluded from the computation because the stock-based awards ’ exercise prices 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.