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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Tax Disclosure [Abstract]    
Effective income tax rate 27.10% 38.00%
Minor discrete income tax benefits $ (9.1)  
Difference in effective income tax rate 9.60%  
Correction of deferred taxes (3.7)  
Federal
   
Income Tax Disclosure [Abstract]    
Federal income tax refund received $ 58.1