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Income Taxes (Details Textual) (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 Taxes (Textual) [Abstract]        
Income tax provision (benefit) $ 7.0 $ 25.2 $ (1.4) $ 47.4
Income tax benefit rate   27.90% 6.70% 27.80%
Statutory U.S. federal tax rate   35.00%   35.00%
Settlement of tax disputes $ 5   $ 10