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Share-Based Compensation - Summary Of Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense before income taxes $ 17.9 $ 16.8 $ 59.4 $ 52.7
Related income tax benefits 3.8 5.9 12.5 18.4
Share-based compensation expense, net of taxes $ 14.1 $ 10.9 $ 46.9 $ 34.3
U.S. federal statutory rate (as a percent) 21.00% 35.00% 21.00% 35.00%
Cost of revenue        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense before income taxes $ 1.7 $ 1.4 $ 5.1 $ 4.4
Research and development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense before income taxes 3.4 3.2 10.6 9.6
Selling and marketing        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense before income taxes 3.3 2.8 10.5 8.8
General and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share-based compensation expense before income taxes $ 9.5 $ 9.4 $ 33.2 $ 29.9