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Net Income per Share (Tables)
 9 Months Ended
Sep. 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 (loss) and weighted-average common shares outstanding for purposes of calculating diluted net loss per share for the three and nine months ended September 30, 2013 and 2012:
(in millions, except per share amounts)
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2013
 
2012
 
2013
 
2012
Net income (loss)
 
$
13.8

 
$
(48.2
)
 
$
(4.5
)
 
$
(61.9
)
Basic weighted-average number of shares outstanding
 
171.5

 
168.7

 
170.9

 
168.3

Effect of dilutive securities
 
 
 
 
 
 
 
 
Share-based awards
 
0.1

 
—

 
—

 
—

Prepaid common stock purchase contracts
 
44.9

 
—

 
—

 
—

Diluted weighted-average number of shares outstanding
 
216.5

 
168.7

 
170.9

 
168.3

Net income (loss) per share
 
 
 
 
 
 
 
 
Basic
 
$
0.08

 
$
(0.29
)
 
$
(0.03
)
 
$
(0.37
)
Diluted
 
$
0.06

 
$
(0.29
)
 
$
(0.03
)
 
$
(0.37
)