STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Common Stock

The following table shows the beginning and ending balances of our issued and outstanding common stock for the year ended December 31, 2023, 2022, and 2021:

	Year Ended December 31,
	2023	2022	2021
Shares issued and outstanding, beginning balance	60,555,661	65,968,224	66,456,663
Issuance of common stock from vested restricted stock units	774,579	841,861	748,881
Issuance of common stock from exercise of stock options	182,067	116,592	73,118
Issuance of common stock for employee stock purchase plan	175,446	158,134	136,861
Issuance of common stock for the acquisition of Zenefits	—	193,221	—
Repurchase of common stock	(10,734,790)	(6,398,279)	(1,161,909)
Awards effectively repurchased for required employee withholding taxes	(288,492)	(324,092)	(285,390)
Shares issued and outstanding, ending balance	50,664,471	60,555,661	65,968,224

Schedule of Stock Repurchase

The following table summarizes the share repurchases under this program for the years ended December 31, 2023, 2022 and 2021:

	Year Ended December 31,
	2023		2022		2021
Total cost (in millions)	$	1,112	$	519	$	94
Total shares	10,734,790		6,398,279		1,161,909
Average price per share	$	103.59	$	81.07	$	81.13