Net Income per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Schedule of reconciliation of net income and weighted-average common shares outstanding for purposes of calculating diluted net income per share

The following is a reconciliation of net income and weighted-average common shares outstanding for purposes of calculating diluted net income per share for the three months ended March 31, 2013 and 2012:

(in millions, except per share amounts)	For the Three Months Ended March 31,
	2013		2012
Net income	$	0.9	$	1.1
Basic weighted-average number of shares outstanding	169.7		168.1
Effect of dilutive securities
Common stock purchase warrants	—		0.4
Share-based awards	0.2		—
Prepaid common stock purchase contracts	46.4		—
Diluted weighted-average number of shares outstanding	216.3		168.5
Net income per share
Basic	$	0.01	$	0.01
Diluted	$	—	$	0.01