Stockholders' Equity - Schedule of Common Stock (Details) - shares		3 Months Ended		6 Months Ended
	Mar. 17, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued and outstanding, beginning balance (in shares)		62,258,896	65,881,233	65,968,224	66,456,663
Shares issued and outstanding, beginning balance		62,258,896	65,881,233	65,968,224	66,456,663
Issuance of common stock for the acquisition of Zenefits (in shares)				193,221
Repurchase of common stock (in shares)	(3,653,690)	(408,478)	(181,250)	(4,419,423)	(925,251)
Awards effectively repurchased for required employee withholding taxes (in shares)		(50,981)	(49,391)	(97,796)	(117,619)
Shares issued and outstanding, ending balance (in shares)		62,087,303	65,864,116	62,087,303	65,864,116
Shares issued and outstanding, ending balance		62,087,303	65,864,116	62,087,303	65,864,116
Issuance of common stock from vested restricted stock units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)		170,358	130,560	296,880	346,518
Issuance of common stock from exercise of stock options
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options (in shares)		43,700	8,894	72,389	29,735
Issuance of common stock for employee stock purchase plan
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		73,808	74,070	73,808	74,070