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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]            
Effective tax rates 36.00%   36.00% 34.00% 41.00%  
2012 Federal R&D credit recognized   $ 3.1        
Unrecognized tax benefits 59.7     59.7   43.3
Reduction in provision for income taxes due to impact of effective tax rate 50.1     50.1    
Gross interest and penalties accrued 3.7     3.7    
Deferred tax assets, other current assets 11.4     11.4   11.0
Deferred tax assets, other non-current assets 68.6     68.6   56.9
Income tax benefits attributable to the exercise of employee stock options recorded directly to Additional paid-in-capital $ 19.7   $ 0.1 $ 51.1 $ 4.2