The components of basic and diluted earnings per share are as follows:


	Three Months Ended				Six Months Ended
	June 30,				June 30,
In millions, except per share amounts	2013		2012		2013		2012
Net income available for common stockholders	$	108	$	112	$	167	$	203

Weighted average outstanding shares of common stock		163.4		168.7		164.4		168.3
Dilutive effect of employee stock options and restricted stock		2.9		3.6		3.0		3.7

Common stock and common stock equivalents		166.3		172.3		167.4		172.0

Earnings per share:
Basic	$	0.66	$	0.66	$	1.02	$	1.21
Diluted	$	0.65	$	0.65	$	1.00	$	1.18