Corporate Investments and Funds Held For Clients - Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Corporate Investments and Funds Held for Clients [Line Items]
Cash and cash equivalents, amortized cost		$ 346,456	$ 294,025
Funds held for clients cash and cash equivalents, amortized cost		2,268,265	2,128,735
Total investments, amortized cost		2,649,716	2,622,647
Gross unrealized losses		(101)	(1,256)
Cash and cash equivalents, fair value		346,456	294,025	$ 536,545
Funds held for clients cash and cash equivalents, fair value		2,268,265	2,128,735
Total investments, fair value		2,649,615	2,621,391
Available-for-sale Securities [Member] | U.S. Treasury Securities [Member]
Corporate Investments and Funds Held for Clients [Line Items]
Amortized cost	[1]	34,995	174,887
Gross unrealized losses	[1]	(101)	(1,256)
Fair value	[1]	$ 34,894	173,631
Available-for-sale Securities [Member] | Certificates of Deposit [Member]
Corporate Investments and Funds Held for Clients [Line Items]
Amortized cost	[1]		25,000
Fair value	[1]		$ 25,000

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