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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income Taxes [Abstract]          
Effective income tax rate (in hundredths) 42.10% 50.70% 42.70% 50.80%  
Tax rate excluding the impact of non-recurring items and the French business tax (in hundredths) 31.00% 34.00% 31.00% 35.00%  
U.S. Federal statutory rate (in hundredths)     35.00%    
Expected annual effective income tax rate     approximately 40%    
Gross unrecognized tax benefits, including interest and penalties $ 28.6   $ 28.6   $ 28.5
Related tax benefits 2.5   2.5   2.5
Net unrecognized tax benefits $ 26.1   $ 26.1   $ 26.0