The calculation of net earnings per share – basic and net earnings per share – diluted was as follows:

	3 Months Ended				9 Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Net earnings per share – basic:
Net earnings available to common shareholders	$	63.1	$	79.6	$	144.3	$	188.0
Weighted-average common shares outstanding		79.5		81.7		79.9		81.9
	$	0.79	$	0.97	$	1.81	$	2.30
Net earnings per share – diluted:
Net earnings available to common shareholders	$	63.1	$	79.6	$	144.3	$	188.0
Weighted-average common shares outstanding		79.5		81.7		79.9		81.9
Effect of dilutive securities – stock options		0.3		0.4		0.3		0.9
Effect of other share-based awards		0.2		0.3		0.4		0.5
		80.0		82.4		80.6		83.3
	$	0.79	$	0.97	$	1.79	$	2.26

There were 4.2 million and 3.9 million share-based awards excluded from the calculation of net earnings per share – diluted for the three months ended September 30, 2012 and 2011, respectively, and 4.2 million and 2.5 million share-based awards excluded from the calculation of net earnings per share – diluted for the nine months ended September 30, 2012 and 2011, respectively, as the exercise price for these awards was greater than the average market price of the common shares during the period.