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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
Effective income tax rate (as a percent) 37.50% 23.30% 32.90% 33.50%
Federal statutory income tax rate     35.00% 35.00%
Income tax benefit     $ 16.1