Corporate Investments and Funds Held for Clients - Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Corporate Investments And Funds Held For Clients [Line Items]
Cash and cash equivalents, amortized cost		$ 400,730	$ 277,978
Funds held for clients' cash and cash equivalents, amortized cost		2,008,365	1,534,894
Amortized cost		199,367
Investments Amortized Cost, Total		2,608,462	2,124,551
Gross unrealized losses	[1]	(4,757)
Cash and cash equivalents, fair value		400,730	277,978	$ 151,710
Funds held for clients' cash and cash equivalents, fair value		2,008,365	1,534,894
Fair value		194,610
Total investments, fair value		2,603,705	2,124,551
Available-for-sale Securities [Member] | Commercial Paper [Member]
Corporate Investments And Funds Held For Clients [Line Items]
Amortized cost	[2]		311,679
Fair value	[2]		$ 311,679
Available-for-sale Securities [Member] | U.S. Treasury Securities [Member]
Corporate Investments And Funds Held For Clients [Line Items]
Amortized cost	[2]	174,367
Gross unrealized losses	[1],[2]	(4,757)
Fair value	[2]	169,610
Available-for-sale Securities [Member] | Certificates of Deposit [Member]
Corporate Investments And Funds Held For Clients [Line Items]
Amortized cost	[2]	25,000
Fair value	[2]	$ 25,000

[1] These securities have been in a gross unrealized loss position for a period of less than 12 months.

[2] All available-for-sale securities were included within the funds held for clients.