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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Tax Disclosure        
Effective income tax rate 35.90% 37.80% 34.30% 27.40%
Discrete income tax benefits $ 1.5     $ 21.5
Difference in effective income tax rate 2.40%     10.30%
Correction of deferred taxes 2.3      
Federal
       
Income Tax Disclosure        
Federal income tax refund received     71.4