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Employee Benefit Plans and Stockholders' Equity - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock authorized in ESPP (shares)	1,500,000
Maximum payroll deductions (as a percent)	10.00%
Employee purchase price floor (as a percent)	85.00%
Stock reserved for issuance (shares)				9,800,000
Purchases of treasury stock (shares)	0	0	800,000
Options in-the-money (shares)	0
Unrecognized compensation costs related to unvested restricted stock units	$ 147.6
401(k) Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution (as a percent)	75.00%
Employer matching contribution (as a percent)	50.00%
Employee contribution (as a percent)	5.00%
Total matching contributions	$ 6.7	$ 4.8
Employee Stock Purchase Plan 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock for Employee Stock Purchase Plan (shares)	89,194	150,408	189,904
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of RSUs vested	$ 331.8	$ 207.2	$ 120.9
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years

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