Employee Benefit Plans - Share Based Compensation by Cost and Expense Categories (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 57.5	$ 42.0
Stock options
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	2.7	1.9
RSUs, RSAs, and PSAs
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	49.9	34.9
ESPP
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	4.9	5.2
Cost of revenues - Product
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	1.3	1.4
Cost of revenues - Service
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	4.5	4.2
Research and development
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	24.2	15.2
Sales and marketing
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	16.5	13.8
General and administrative
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 11.0	$ 7.4