Net Earnings (Loss) Per Share

9 Months Ended

Sep. 30, 2020

(8) Net Earnings (Loss) Per Share

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

	3 Months Ended				9 Months Ended
	September 30,				September 30,
	2020		2019		2020			2019
Net earnings (loss) available to common shareholders	$	10.3	$	146.1	$	(52.4	)	$	326.9
Weighted-average common shares outstanding (in millions)
Weighted-average common shares outstanding - basic		58.2		59.9		58.4			60.2
Effect of dilutive securities - stock options		—		0.1		—			0.1
Effect of other share-based awards		0.3		0.3		—			0.3
Weighted-average common shares outstanding - diluted		58.5		60.3		58.4			60.6
Net earnings (loss) per share - basic	$	0.18	$	2.44	$	(0.90	)	$	5.43
Net earnings (loss) per share - diluted	$	0.18	$	2.42	$	(0.90	)	$	5.40

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 was not included in the calculations of net loss per share – diluted for the nine months ended September 30, 2020. There were 0.7 million and 0.4 million share-based awards excluded from the calculation of net earnings per share - diluted for the three months ended September 30, 2020 and 2019, respectively, and 1.5 million and 0.4 million share-based awards excluded from the calculation of net earnings (loss) per share - diluted for the nine months ended September 30, 2020 and 2019, respectively, because their impact was anti-dilutive.