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Stockholders' Equity - Schedule of Common Stock (Details) - shares
 3 Months Ended
Mar. 17, 2022
Mar. 31, 2022
Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares issued and outstanding, beginning balance (in shares)   65,968,224 66,456,663
Shares issued and outstanding, beginning balance   65,968,224 66,456,663
Issuance of common stock for the acquisition of Zenefits (in shares)   193,221 0
Repurchase of common stock (in shares) (3,653,690) (4,010,945) (744,001)
Awards effectively repurchased for required employee withholding taxes (in shares)   (46,815) (68,228)
Shares issued and outstanding, ending balance (in shares)   62,258,896 65,881,233
Shares issued and outstanding, ending balance   62,258,896 65,881,233
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)   126,522 215,958
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)   28,689 20,841