Net Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2021

(8) Net Earnings (Loss) Per Share

The calculations of net earnings (loss) per share - basic and net earnings (loss) per share - diluted were as follows:


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net earnings (loss) available to common shareholders	$	97.7	$	10.3	$	271.3	$	(52.4	)
Weighted-average common shares outstanding (in millions)
Weighted-average common shares outstanding - basic		54.3		58.2		54.7		58.4
Effect of dilutive securities - stock options		0.2		—		0.1		—
Effect of other share-based awards		0.7		0.3		0.6		—
Weighted-average common shares outstanding - diluted		55.2		58.5		55.4		58.4
Net earnings (loss) per share - basic	$	1.80	$	0.18	$	4.96	$	(0.90	)
Net earnings (loss) per share - diluted	$	1.77	$	0.18	$	4.90	$	(0.90	)

There were 0.1 million and 0.7 million share-based awards excluded from the calculation of net earnings (loss) per share - diluted for the three months ended September 30, 2021 and 2020, respectively, because their impact was anti-dilutive. There were 0.2 million and 1.5 million share-based awards excluded from the calculation of net earnings (loss) per share - diluted for the nine months ended September 30, 2021 and 2020, respectively, because their impact was anti-dilutive. Due to the net loss for the nine months ended September 30, 2020, the assumed exercise of share-based awards had an anti-dilutive effect and therefore were not included in the calculations of net loss per share - diluted for the nine months ended September 30, 2020.