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Net Income per Share (Tables)
 6 Months Ended
Jun. 30, 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 loss per share for the three and six months ended June 30, 2013 and 2012:
(in millions, except per share amounts)
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
 
2013
 
2012
 
2013
 
2012
Net loss
 
$
(19.2
)
 
$
(14.8
)
 
$
(18.3
)
 
$
(13.7
)
Basic weighted-average number of shares outstanding
 
171.1

 
168.2

 
170.4

 
168.1

Effect of dilutive securities
 
 
 
 
 
 
 
 
Common stock purchase warrants
 
—

 
—

 
—

 
—

Share-based awards
 
—

 
—

 
—

 
—

Prepaid common stock purchase contracts
 
—

 
—

 
—

 
—

Diluted weighted-average number of shares outstanding
 
171.1

 
168.2

 
170.4

 
168.1

Net loss per share
 
 
 
 
 
 
 
 
Basic
 
$
(0.11
)
 
$
(0.09
)
 
$
(0.11
)
 
$
(0.08
)
Diluted
 
$
(0.11
)
 
$
(0.09
)
 
$
(0.11
)
 
$
(0.08
)