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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Tax Disclosure [Abstract]        
Effective income tax rate 36.90% 30.00% 32.00% 32.90%
Discrete income tax benefits   $ 4.5 $ 8.4  
Difference in effective income tax rate   8.40% 4.50%  
Correction of deferred taxes     3.7  
Federal
       
Income Tax Disclosure [Abstract]        
Federal income tax refund received     $ 58.2