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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    
Effective income tax rate 28.90% 35.70%
Minor discrete income tax benefits $ 7.2  
Difference in effective income tax rate 9.30%  
Correction of deferred taxes 3.8  
Federal
   
Income Tax Disclosure    
Federal income tax refund received $ 59.9