XML 64 R44.htm IDEA: XBRL DOCUMENT v2.4.0.8
Earnings Per Share - Summary of Earnings Per Share (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator (in millions):        
Net income available to common stockholders $ 14.0 $ 15.5 $ 49.1 $ 55.6
Denominator (in thousands):        
Weighted average common shares outstanding 23,621 23,240 23,518 23,148
Dilutive effect of stock options and awards 475 683 567 724
Denominator for diluted earnings per share 24,096 23,923 24,085 23,872
Net income per share, basic: $ 0.59 $ 0.67 $ 2.09 $ 2.40
Net income per share, diluted: $ 0.58 $ 0.65 $ 2.04 $ 2.33