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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]          
Effective tax rates 30.00% 39.00% 34.00% 40.00%  
Gross unrecognized tax benefits $ 41.1   $ 41.1   $ 34.8
Reduction in provision for income taxes due to impact of effective tax rate 33.7   33.7    
Gross interest and penalties accrued 0.5   0.5    
Deferred tax assets classified as other current assets 20.2   20.2   13.4
Deferred tax assets classified as other non-current assets 170.7   170.7   $ 106.9
Income tax benefits attributable to the exercise of employee stock options recorded directly to Additional paid-in-capital $ 37.7 $ 21.0 $ 105.6 $ 68.1