Earnings per Share

6 Months Ended

Jun. 30, 2020

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				Six-month period ended
	June 30,				June 30,
	2020		2019		2020		2019
Net earnings attributable to controlling interests	$	153.7	$	110.1	$	500.0	$	444.2
Weighted average number of common shares outstanding		190.5		185.8		189.6		185.1
Dilutive effect of stock options using the treasury stock method		3.6		4.0		4.0		4.0
Weighted average number of common and common equivalent shares outstanding		194.1		189.8		193.6		189.1
Basic net earnings per share	$	0.81	$	0.59	$	2.64	$	2.40
Diluted net earnings per share	$	0.79	$	0.58	$	2.58	$	2.35

Anti-dilutive stock-based awards of 1.6 million and 1.3 million shares were outstanding at June 30, 2020 and 2019, respectively, but were excluded in the computation of the dilutive effect of stock-based awards for the three‑month periods then ended. Anti-dilutive stock-based awards of 1.0 million and 0.8 million shares were outstanding at June 30, 2020 and 2019, respectively, but were excluded in the computation of the dilutive effect of stock-based awards for the six‑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.