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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options [Member]
      
Options excluded from diluted earnings per share 2.5 3.1 2.5
Warrants [Member]
      
Warrants excluded from diluted earnings per share 6.3 6.3 2.1
Maximum [Member] | Stock Options [Member]
      
Exercise price of excluded options 14.28 14.28 14.28
Minimum [Member] | Stock Options [Member]
      
Exercise price of excluded options 3.72 3.72 5.18