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Share-Based Compensation - Summary Of Share-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jul. 03, 2020 | Jun. 28, 2019 | Jul. 03, 2020 | Jun. 28, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 18.0 | $ 27.3 | $ 33.7 | $ 47.0
Income tax benefit | (3.8) | (5.7) | (7.1) | (9.9)
Share-based compensation expense, net of taxes | 14.2 | 21.6 | 26.6 | 37.1
Cost of revenue |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 2.8 | 3.5 | 5.3 | 5.4
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 4.4 | 5.4 | 8.5 | 9.0
Selling and marketing |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 3.1 | 4.6 | 6.1 | 8.4
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 7.7 | $ 13.8 | $ 13.8 | $ 24.2

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