Earnings Per Share

9 Months Ended

Sep. 30, 2021

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				Nine-month period ended
	September 30,				September 30,
	2021		2020		2021		2020
Net earnings attributable to controlling interests	$	225.1	$	176.6	$	797.4	$	676.6
Weighted average number of common shares outstanding		207.0		191.9		201.0		190.4
Dilutive effect of stock options using the treasury stock method		4.5		4.4		4.5		4.1
Weighted average number of common and common equivalent shares outstanding		211.5		196.3		205.5		194.5
Basic net earnings per share	$	1.09	$	0.92	$	3.97	$	3.55
Diluted net earnings per share	$	1.06	$	0.90	$	3.88	$	3.48

Anti-dilutive stock-based awards of 1.6 million shares were outstanding at September 30, 2021 that were excluded in the computation of the dilutive effect of stock-based awards for the three-month period then ended. There were no anti-dilutive stock-based awards outstanding at September 30, 2020 that were excluded in the computation of the dilutive effect of stock-based awards for the three‑month period then ended. Anti-dilutive stock-based awards of 1.2 million and 1.0 million shares were outstanding at September 30, 2021 and 2020 that were excluded in the computation of the dilutive effect of stock-based awards for the nine-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.