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Earnings Per Share (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator (in millions):        
Net income available to common stockholders $ 15.5 $ 24.6 $ 40.1 $ 46.1
Denominator (in thousands):        
Weighted average common shares outstanding 23,147 23,726 23,101 23,691
Dilutive effect of stock options and awards 747 793 719 832
Denominator for diluted earnings per share 23,894 24,519 23,820 24,523
Net income per share, basic $ 0.67 $ 1.04 $ 1.74 $ 1.95
Net income per share, diluted $ 0.65 $ 1.00 $ 1.68 $ 1.88