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Income Taxes , Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]          
Effective tax rate (percent) 8.00% 15.00% 9.00% 10.00%  
U.S. federal and state taxes, withholding taxes and foreign taxes $ 28.2 $ 24.5 $ 56.5 $ 42.0  
Tax benefit from foreign-derived intangible income deduction 5.0   9.6    
Excess tax benefits on stock compensation 10.0 11.7 25.2 27.7  
Unrecognized tax benefits and related interest release due to expiration of statute of limitations 8.7 10.0 8.7 10.0  
Increase in tax expense related to Ninth Circuit Altera decision   $ 10.3   $ 10.3  
Unrecognized tax benefits 62.9   62.9   $ 67.5
Unrecognized tax benefits that would favorably affect effective tax rate 57.6   57.6    
Accrued interest and penalties related to uncertain tax benefits 13.4   13.4   $ 14.1
Possible decrease in unrecognized tax benefits (up to) $ 4.4   $ 4.4