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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 expense (benefit) $ 37.6 $ 9.7 $ 62.3 $ (3.9)
Effective income tax rate 69.20% 34.20% 69.80% 58.20%
Portion of income tax receivable relates to contributions to the U.S. Salaried Retirement Plan 85.3   85.3  
Income tax receivable 134.1   134.1  
Preliminary audit settlement $ 9.9   $ 9.9