Corporate Investments and Funds Held For Clients - Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Corporate Investments and Funds Held for Clients [Line Items]
Cash and cash equivalents, amortized cost		$ 505,590	$ 400,730
Funds held for clients' cash and cash equivalents, amortized cost		2,191,993	2,008,365
Amortized cost		199,492
Total investments, amortized cost		2,897,075	2,608,462
Gross unrealized losses		(3,707)	(4,757)
Cash and cash equivalents, fair value		505,590	400,730	$ 360,594
Funds held for clients cash and cash equivalents, fair value		2,191,993	2,008,365
Fair value		195,785
Total investments, fair value		2,893,368	2,603,705
Available-for-sale Securities [Member] | U.S. Treasury Securities [Member]
Corporate Investments and Funds Held for Clients [Line Items]
Amortized cost	[1]	174,492	174,367
Gross unrealized losses	[1]	(3,707)	(4,757)
Fair value	[1]	170,785	169,610
Available-for-sale Securities [Member] | Certificates of Deposit [Member]
Corporate Investments and Funds Held for Clients [Line Items]
Amortized cost	[1]	25,000	25,000
Fair value	[1]	$ 25,000	$ 25,000

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