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Net Income Per Share (Options and Warrants Excluded From the Calculation) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Options excluded from diluted earnings per share 3.1 2.5 1.9
Warrants excluded from diluted earnings per share 6.3 2.1  
Exercise price of excluded warrants $ 7.50 $ 7.50  
Maximum [Member]
      
Exercise price of excluded options $ 14.28 $ 14.28 16.90
Minimum [Member]
      
Exercise price of excluded options $ 3.72 $ 5.18 5.00