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Effective Income Tax Rate (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Income Tax Disclosure [Abstract]    
Effective income tax rate 39.00% 37.00%
One hundred percent valuation allowance 100.00%  
Reversal of valuation allowance   $ 26.2
Tax contingency reserve   $ 19.5