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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        
Effective income tax rate 39.00% 9.50% 33.80% 20.30%
Discrete income tax benefits   $ 29.1   $ 30.8
Difference in effective income tax rate   28.20%   17.40%
Federal
       
Income Tax Disclosure        
Federal income tax refund received     59.9