Earnings Per Share Data

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Earnings Per Share Data

Earnings Per Share Data

Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share adjusts basic earnings per common share for the effects of potentially dilutive common shares, if the effect is not anti-dilutive. Potentially dilutive common shares include the dilutive effects of shares issuable under the stock option and performance award plans.

The following table reconciles the basic earnings per share computation to the diluted earnings per share computation (in millions, except share and per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Net income available to common stockholders for purposes of computing basic and diluted earnings per share	$	129.8	$	15.4	$	223.4	$	119.1
Weighted-average number of shares outstanding (in thousands):
Basic shares	110,160		109,968		110,121		109,936
Effect of dilution	237		355		277		356
Diluted shares	110,397		110,323		110,398		110,292
Earnings per share:
Basic earnings per share	$	1.18	$	0.14	$	2.03	$	1.08
Diluted earnings per share	$	1.18	$	0.14	$	2.02	$	1.08
Potentially dilutive shares excluded from the calculation (in thousands):
Stock options excluded as their inclusion would be anti-dilutive	67		—		52		57