XML 52 R61.htm IDEA: XBRL DOCUMENT v3.20.1
Income Taxes , Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Effective tax rate (percent) 11.00% 2.00%  
U.S. federal and state taxes, withholding taxes and foreign taxes $ 28.3 $ 17.5  
Excess tax benefits on stock compensation 15.2 $ 16.0  
Tax benefit from foreign-derived intangible income deduction 4.8    
Increase in unrecognized tax benefits related to Ninth Circuit Altera decision 8.5    
Unrecognized tax benefits 65.6   $ 67.5
Unrecognized tax benefits that would favorably affect effective tax rate 60.4    
Accrued interest and penalties related to uncertain tax benefits 14.5   $ 14.1
Possible decrease in unrecognized tax benefits (up to) $ 10.4