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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | $ 67.7 | $ 79.4 | $ 78.3
Income tax benefit | (14.2) | (16.7) | (16.4)
Share-based compensation expense, net of taxes | 53.5 | 62.7 | 61.9
Cost of revenue |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | 11.5 | 10.6 | 7.0
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | 18.2 | 17.0 | 14.3
Selling and marketing |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | 12.9 | 14.8 | 14.1
General and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | $ 25.1 | $ 37.0 | $ 42.9

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