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 June 30,				Six-month period ended June 30,
	2019		2018		2019		2018
Net earnings attributable to controlling interests	$	110.1	$	114.9	$	444.2	$	388.6

Weighted average number of common shares outstanding		185.8		182.4		185.1		181.9
Dilutive effect of stock options using the treasury stock method		4.0		3.1		4.0		3.3

Weighted average number of common and common equivalent shares outstanding		189.8		185.5		189.1		185.2

Basic net earnings per share	$	0.59	$	0.63	$	2.40	$	2.14

Diluted net earnings per share	$	0.58	$	0.62	$	2.35	$	2.10

Anti-dilutive stock-based awards of 1.3 million and 1.7 million shares were outstanding at June 30, 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. Anti-dilutive stock-based awards of 0.8 million and 1.0 million shares were outstanding at June 30, 2019 and 2018, 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.