Earnings Per Share:

Basic earnings per share are computed by dividing net income by the weighted-average number of common shares outstanding during the period. Diluted earnings per share are computed by dividing net income by the sum of the weighted-average number of shares and the number of equivalent shares assumed outstanding, if dilutive, under our stock-based compensation plans.

The computations of basic and diluted earnings per share for Income from continuing operations were as follows (in millions, except per share data):



	For the Years Ended December 31,
	2018			2017			2016
Net income	$	359.0		$	305.7		$	277.8
Add: Loss from discontinued operations	1.3			1.4			0.8
Income from continuing operations	$	360.3		$	307.1		$	278.6

Weighted-average shares outstanding – basic	40.6			42.2			43.4
Add: Potential effect of diluted securities attributable to stock-based payments	0.5			0.6			0.6
Weighted-average shares outstanding – diluted	41.1			42.8			44.0

Earnings per share - Basic:
Income from continuing operations	$	8.87		$	7.28		$	6.41
Loss from discontinued operations	(0.03		)	(0.03		)	(0.02		)
Net income	$	8.84		$	7.25		$	6.39

Earnings per share - Diluted:
Income from continuing operations	$	8.77		$	7.17		$	6.34
Loss from discontinued operations	(0.03		)	(0.03		)	(0.02		)
Net income	$	8.74		$	7.14		$	6.32

An insignificant number of stock appreciation rights were outstanding but not included in the diluted earnings per share calculation because the assumed exercise of such rights would have been anti-dilutive.