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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
Dec. 31, 2011
Income Taxes [Abstract]          
Effective income tax rate (in hundredths) 41.90% 45.90% 47.30% 47.90%  
U.S. Federal statutory rate (in hundredths) 35.00%        
Expected annual effective income tax rate (in hundredths) mid-forty percent range        
Tax rate excluding French business tax (in hundredths) 30.00% 36.00%      
Tax rate excluding discrete items and French business tax (in hundredths)     34.00% 37.00%  
Gross unrecognized tax benefits, including interest and penalties $ 25.8   $ 25.8   $ 27.0
Related tax benefits 2.8   2.8   3.6
Net unrecognized tax benefits $ 23.0   $ 23.0   $ 23.4