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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Calculation of basic and diluted earnings per share
Basic and diluted earnings per share for 2012, 2011 and 2010 were calculated as follows:
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
Numerator:
 
 

 
 
 
 
Net income
 
$
85.8

 
$
25.1

 
$
12.0

Less: Net income attributable to participating securities
 
—

 
—

 
(0.1
)
Net income available to common stockholders
 
$
85.8

 
$
25.1

 
$
11.9

 
 
 
 
 
 
 
Denominator - Weighted-average common shares outstanding (in thousands):
 
 
 
 
 
 
Basic1
 
19,115

 
18,979

 
19,377

Diluted2
 
19,278

 
18,979

 
19,377

Earnings per common share, Basic:
 
 
 
 
 
 
Net income per share
 
$
4.49

 
$
1.32

 
$
0.61

Earnings per common share, Diluted:
 
 
 
 
 
 
Net income per share2
 
$
4.45

 
$
1.32

 
$
0.61

_____________
1 
The basic weighted-average number of common shares outstanding during the period excludes unvested share-based payment awards.

2 
The diluted weighted-average number of common shares outstanding and diluted earnings per share for 2012 were calculated using the treasury method. The diluted weighted-average number of common shares outstanding and diluted earnings per share for 2011 and 2010 were calculated using the two-class method (see Note 1).