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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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