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Income Taxes , Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]          
Effective tax rate (percent) 4.00% 24.00% 8.00% 16.00%  
U.S. federal and state taxes, withholding taxes and foreign taxes $ 17.5 $ 32.7 $ 74.8 $ 75.4  
Tax benefit from foreign-derived intangible income deduction 16.0   25.6    
Excess tax benefits on stock compensation 12.5 $ 6.9 37.6 34.6  
Unrecognized tax benefits and related interest release due to expiration of statute of limitations     9.0 10.0  
Increase in tax expense related to unrecognized tax benefit from Ninth Circuit Altera decision       $ 10.3  
Unrecognized tax benefits 67.1   67.1   $ 67.5
Unrecognized tax benefits that would favorably affect effective tax rate 61.7   61.7    
Accrued interest and penalties related to uncertain tax benefits 13.1   13.1   $ 14.1
Possible decrease in unrecognized tax benefits (up to) $ 4.0   $ 4.0