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Income Taxes (Details) - USD ($)
$ in Billions
 1 Months Ended 9 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Oct. 01, 2017
Income Tax (Textuals)      
Worldwide effective income tax rate (as a percent)   17.60% 20.50%
Provisional tax cost $ 13.0    
Effective income tax rate adjustment business combination (as a percent)     1.40%
Excess tax benefit from share based compensation   1.20% 2.10%
Accelerated deduction (as a percent)   2.00%  
Estimated tax impact, foreign taxes (as a percent)   2.50%  
Increase to the transition tax on undistributed foreign earnings   $ 0.1  
Deferred tax liability foreign earnings   0.3  
Deferred tax assets offset   0.2  
Unrecognized tax benefits   $ 3.2  
Foreign Tax Authority      
Income Tax (Textuals)      
Change in enacted rate (as a percent)   2.50%  
Domestic Tax Authority      
Income Tax (Textuals)      
Change in enacted rate (as a percent)   0.40%