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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense |  | $ 79.4 | $ 78.3 | $ 69.8
Related income tax benefits at federal rate |  | (16.7) | (16.4) | (24.4)
Share-based compensation expense, net of taxes |  | 62.7 | 61.9 | 45.4
Cost of revenue |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense |  | 10.6 | 7.0 | 6.0
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense |  | 17.0 | 14.3 | 12.5
Selling and marketing |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense |  | 14.8 | 14.1 | 11.7
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense |  | $ 37.0 | $ 42.9 | $ 39.6
Accounting Standards Update 2016-09 |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, Tax | $ 68.1 |  |  |

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