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Earnings Per Share (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator (in millions):        
Net income/(loss) available to common stockholders $ 15.5 $ (16.8) $ 55.6 $ 29.3
Denominator (in thousands):        
Weighted average common shares outstanding 23,240 23,711 23,148 23,698
Dilutive effect of stock options and awards 683 0 724 918
Denominator for diluted earnings per share 23,923 23,711 23,872 24,616
Net income/(loss) per share, basic $ 0.67 $ (0.71) $ 2.40 $ 1.24
Net income/(loss) per share, diluted $ 0.65 $ (0.71) $ 2.33 $ 1.19